• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 121
  • 32
  • 16
  • 3
  • 2
  • 2
  • 1
  • 1
  • Tagged with
  • 193
  • 193
  • 99
  • 83
  • 44
  • 43
  • 41
  • 30
  • 27
  • 25
  • 24
  • 22
  • 22
  • 21
  • 17
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Crescimento e produção de feijão-caupi sob efeito de veranico nos sistemas de plantio direto e convencional / Growth and yield of cowpea under dry spell in conventional and no tillage crop systems

Freitas, Rômulo Magno Oliveira de 24 February 2012 (has links)
Made available in DSpace on 2016-08-12T19:18:43Z (GMT). No. of bitstreams: 1 RomuloMOF_DISSERT.pdf: 1866145 bytes, checksum: 9f9729462fbec5049c6b3e9bb450b4fa (MD5) Previous issue date: 2012-02-24 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The cowpea crop has great importance for the Brazilian Northeast, especially for the poorest population. One of the major problems encountered for this crop is drought stress caused by erratic rainfall, coupled with the high temperatures common in this region. The no-tillage system has features, such as reduction of soil water evaporation, higher water retention and lower soil temperature fluctuations, and can be a way to minimize the water stress in a cowpea crop. Thus, this study aims to obtain information on growth, yield components and cowpea yield under moisture stress in no-tillage and conventional crop systems. For this purpose an experiment was conducted at Universidade Federal Rural do Semi-Arido, in a split plot with randomized complete blocks design with four replications, using the cowpea cultivar BRS Guariba, and no-tillage and conventional crop systems treatments. For the dry spells simulation, irrigation systems has been suspended at 34 days after sowing, during the onset of flowering, for periods of 2, 6, 10, 14, 18 and 22 days, after what the irrigation was resumed. To evaluate the effect of the crop systems and moisture stress on growth, samples were taken between 15 and 64 days after sowing, in the treatments with and without irrigation (22 days duration). The evaluation of yield components (pod length, number of grains per pod, number of pods per plant and hundred grains weight) and yield was performed at 70 days after sowing. The tillage systems influenced the leaf area, and stem leaf, pod and plant dry weight. The growth rates were influenced by the plant phenological phase (age) and by water stress. The highest growth rates were achieved in the no-tillage system. Water stress affected negatively all the variables, regardless of tillage system. The no-tillage system was more productive both for the irrigated and the stress treatments. The dry spells periods affected grain yield and all other yield components studied in a negative way, except for the hundred grains weight. Among the systems studied, the no-tillage system provides higher values for the yield components, except for the hundred grains weight / A cultura do feijão-caupi possui grande importância para a região Nordeste, principalmente para a população mais carente. Um dos grandes problemas encontrados para essa cultura é o estresse hídrico, provocado pela irregularidade das chuvas, aliado a altas temperaturas, comuns a esta região. O sistema de plantio direto possui características como redução da evaporação da água do solo, maior retenção do solo e menores oscilações da temperatura, e pode ser uma forma de minimizar o efeito do estresse hídrico para a cultura do feijão-caupi. Deste modo, o presente trabalho se propõe a obter informações relativas ao crescimento, componentes da produção e rendimento de feijão-caupi sob veranico nos sistemas de plantio direto e convencional. Para isso, foi realizado, na Universidade Federal Rural do Semi-Árido, um experimento em delineamento de blocos completos casualizados em parcelas subdivididas com 4 repetições, utilizando-se a cultivar de feijão-caupi BRS Guariba em plantio direto e convencional. Para aplicação do veranico, a irrigação foi suspensa nos sistemas aos 34 dias após a semeadura por períodos de 2, 6, 10, 14, 18 e 22 dias sem irrigação, ocasião em que foi verificado o início do florescimento. Para avaliar o efeito dos sistemas e do veranico no crescimento, foram realizadas coletas entre os 15 e 64 dias após a semeadura, nos tratamentos com e sem irrigação (22 dias de duração). A avaliação dos componentes de produção (comprimento de vagem, número de grãos por vagem, número de vagens por planta e peso de cem grãos) e rendimento de grãos foi realizada aos 70 dias após a semeadura. Os sistemas de plantio influenciam o crescimento da área foliar, da matéria seca do caule, de folhas, de vagens e total do feijão-caupi. Os índices de crescimento são influenciados pela fase fenológica da planta (idade) e pelo estresse hídrico. As maiores taxas de crescimento foram alcançadas no sistema de plantio direto. O estresse hídrico afetanegativamente todas as variáveis avaliadas, independentemente do sistema de plantio. O sistema de plantio direto é mais produtivo do que o convencional quando em irrigação e em condição de estresse. Os períodos de veranico influenciaram o rendimento de grãos e todos os componentes de produção estudados de forma negativa, com exceção do peso de cem grãos. Entre os sistemas estudados, o direto é o que proporciona maiores valores para os componentes de produção, exceto peso de cem grãos
112

Srovnání GM hybridu kukuřice MON 810 s vybranými hybridy. / Comparison of GM hybrid maize MON 810 with hybrids selected

POSPÍCHAL, Miroslav January 2015 (has links)
The aim of the thesis was to evaluate and to compare the rate of corn borer and the production capability of 4 hybrids of corn (Zeamays L.) of different earliness. For the comparison a variety test was layed out in the land of my father in Klimětice (Central Bohemia). Before the harvest a sampling for detection of dry matter content in the biomass has been made to determinate the date of harvest. The number of samplings depended on the attainment of required dry matter content in the biomass. By the harvest the yield and dry matter content of the biomass, yield and percentage of corn ears, dry matter yield and the starch yield were determined. In the experiments the differences in infestation of corn borer were determined. Further differences in observed parameters were found out, which were dependent on the different utility trends and earliness of the given hybrids. The result was the appreciation of the given hybrids and determining of their suitability for their growing in conditions of my fathers lands.
113

Caracterização morfológica e produtiva em variedades de palma forrageira / Morphological and productive characterization in forage cactus varieties

Amorim, Philipe Lima de 25 July 2011 (has links)
In order to evaluate morphological and productive varieties of forage cactus, we conducted an experiment in randomized block design with 24 treatments and four replications. The characteristics assessed related to the plant and cladodes were: number, weight, area and volume of cladodes primary, secondary, tertiary and quaternary, area index and total volume of cladodes, production of fresh and dry, plant height and width. We also determined the correlations between the length, width, thickness, area and volume with the weight of cladodes. For the number of cladodes, area index and total volume of cladodes observed higher values for cultivars of the genus Nopalea For the weight, area and volume of cladodes, observed higher values for cultivars of the genus Opuntia. For the production of fresh and dry matter, the highest values were observed in the varieties Negro Michoacan F7 and Tamazunchale V12, respectively. For plant height varieties of the genus Opuntia, were the ones with the highest values. The area and volume of cladodes were the characteristics that showed the highest correlations with the weight of the green cladodes. Varieties Negro Michoacan F7, V7 and Tamazunchale V12 are the most suitable for cultivation. To increase the production of biomass should prioritize increasing the volume and number of cladodes to Nopalea and varieties of the genus Opuntia, respectively / Conselho Nacional de Desenvolvimento Científico e Tecnológico / Objetivando-se avaliar características morfológicas e produtivas em variedades de palma, conduziu-se um experimento em um delineamento em blocos casualizados, com 24 tratamentos e quatro repetições. As características avaliadas referentes aos cladódios e a planta foram: número, peso, área e volume de cladódios primários, secundários, terciários e quaternários, índice de área e volume total de cladódios, produção de massa fresca e seca, altura e largura de planta. Determinou-se também as correlações entre o comprimento, largura, espessura, área e volume com o peso dos cladódios. Para o número de cladódios, índice de área e volume total de cladódios observou-se maiores valores para as cultivares do gênero Nopalea, enquanto para peso, área e volume de cladódios, observou-se maiores valores para plantas do o gênero Opuntia. Para, os. Para as produções de massa fresca e seca, os maiores valores foram observados nas variedades Negro Michoacan F7 e Tamazunchale V12, respectivamente. Para altura de plantas as variedades do gênero Opuntia, foram as que apresentaram os maiores valores. A área e o volume dos cladódios foram às características que apresentaram os maiores coeficientes de correlação com o peso verde dos cladódios. As variedades Negro Michoacan F7, V7 e Tamazunchale V12 são as mais indicadas ao cultivo. Para elevação da produção de biomassa deve-se priorizar o aumento do volume e do número dos cladódios para variedades do gênero Nopalea e Opuntia, respectivamente.
114

Estimação estocástica de parâmetros produtivos da soja uso do modelo PPDSO em um estudo de caso em Piracicaba/SP

Alambert, Marcelo Rodrigues 12 November 2010 (has links)
Submitted by Roberta Lorenzon (roberta.lorenzon@fgv.br) on 2011-06-01T14:19:41Z No. of bitstreams: 2 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) / Approved for entry into archive by Suzinei Teles Garcia Garcia(suzinei.garcia@fgv.br) on 2011-06-01T14:54:51Z (GMT) No. of bitstreams: 2 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) / Approved for entry into archive by Suzinei Teles Garcia Garcia(suzinei.garcia@fgv.br) on 2011-06-01T14:55:48Z (GMT) No. of bitstreams: 2 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) / Made available in DSpace on 2011-06-01T15:02:41Z (GMT). No. of bitstreams: 2 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) 65080100022.pdf: 2118563 bytes, checksum: e772406b416ab303d53d7648ac10d40b (MD5) Previous issue date: 2010-11-12 / Brazil is the second major soybean [Glycine max (L.) Merr.] producer and the seventh one on soybean oil. Brazilian production reached 61 million tons at 2008 and the forecast to 2020 is 105 million tons. Biodiesel consumption at 2008 was one million tons and the demand for this biofuel will reach 3,1 million tons at 2020. To amount this demand, the planting area on centerwest region of Brazil will increase, but also efforts on productivity must be required. Looking for a better knowledge on the climate variables temperature and global radiation over soybean development, yield and oil productivity was purposed a stochastic model with truncated normal distribution for maximum, minimum and average temperature data. Included in this model, a triangular asymmetric distribution to determine the probable oil productivity. Eight sowing dates were stipulated on Piracicaba/SP where the climate data was given from ESALQ/USP agrometeorologic station. The conclusions were: (i) there were decreases on soybean cycle duration with the average temperature increase; (ii) the soybean cycle decrease restricted soybean yield and oil productivity; (iii) the global radiation thirty days after antesis reflected on photo assimilates partition and soybean yield and oil productivity; (iv) stochastic models can be used for soybean yield and oil productivity forecast. / O Brasil é o segundo produtor mundial de soja [Glycine max (L.) Merr.] e o sétimo de óleo vegetal. A produção brasileira desta oleaginosa alcançou 61 milhões de toneladas na safra 2007/08 e projeta-se, para 2020, produção de 105 milhões de toneladas. O consumo de biodiesel em 2008 representou um milhão de toneladas e a demanda por este biocombustível deverá atingir 3,1 milhões de toneladas em 2020. Para atender esta demanda haverá ampliação da área plantada principalmente na região Centro-Oeste, mas também exigirá esforços no aumento de produtividade. Visando melhor conhecimento das inferências das variáveis climáticas temperatura e radiação global sobre o desenvolvimento da soja e sua produtividade de grãos e óleo, foi proposto um modelo estocástico com distribuição normal truncada para os dados de temperatura máxima, mínima e média. Também foi incluído neste modelo distribuição triangular assimétrica para determinação da produtividade de óleo mais provável. Foram estipuladas oito datas de semeadura para a localidade de Piracicaba/SP onde está localizada a estação meteorológica da ESALQ/USP, fornecedora dos dados climáticos utilizados neste estudo. Conclui-se que: (i) ao longo das datas de semeadura houve redução do ciclo com o aumento da temperatura média; (ii) a redução do ciclo da cultura de soja interferiu nas produtividades de grãos e de óleo; (iii) a radiação global média nos trinta dias após a antese refletiram-se na partição de fotoassimilados e na produtividade de grãos e óleo; (iv) os modelos estocásticos podem ser utilizados para a previsão das produtividades de soja e óleo.
115

Parâmentros físicos, perfil fermentativo e composição química de silagem de Pennisetum purpureum com feno de Gliricídia sepium / Physical parameters, fermentation characteristics and chemical composition of Pennisetum purpureum silage with Gliricidia sepium hay

Pacheco, Weverton Filgueira January 2010 (has links)
PACHECO, Weverton Filgueira. Parâmentros físicos, perfil fermentativo e composição química de silagem de Pennisetum purpureum com feno de Gliricídia sepium. 2010. x, 46 f. : Dissertação (Mestrado) - Universidade Federal do Ceará, Centro de Ciências, Departamento de Zootecnia, Programa de Pós-Graduação em Zootecnia. Fortaleza-CE, 2010. / Submitted by Eric Santiago (erichhcl@gmail.com) on 2016-08-03T15:03:58Z No. of bitstreams: 1 2010_dis_wfpacheco.pdf: 263740 bytes, checksum: bcb5a344bdf5eb7031ac3bea3631b2fa (MD5) / Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com) on 2016-08-03T15:38:02Z (GMT) No. of bitstreams: 1 2010_dis_wfpacheco.pdf: 263740 bytes, checksum: bcb5a344bdf5eb7031ac3bea3631b2fa (MD5) / Made available in DSpace on 2016-08-03T15:38:02Z (GMT). No. of bitstreams: 1 2010_dis_wfpacheco.pdf: 263740 bytes, checksum: bcb5a344bdf5eb7031ac3bea3631b2fa (MD5) Previous issue date: 2010 / The objective was to evaluated the physical parameters, the fermentation characteristics and chemical composition of the elephant grass silage with gliricidia hay, using experimental mini-silos in a randomized design with five treatments: 100% elephant grass; 95% elephant grass with 5% gliricídia hay; 90% elephant grass with 10% gliricídia hay; 80% elephant grass with 20% gliricídia hay and 60% elephant grass with 40% gliricidia hay, with five replicates per treatment. Were determined pH, ammonia nitrogen (AN), buffering capacity (BC), specific mass (SM), dry specific mass (DSM), effluent yield (EY), gas production (GP), dry matter recovery (DMR), dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose (HEM), cellulose (CEL), lignin (LG) , ether extract (EE) and total carbohydrates (TC). The addition of gliricídia hay in elephant grass silage increased linearly the DM, DMS and BC. There was a quadratic for SM, EY, DMR, OM, CP, NDF, HEM, LG and TC. The silages presented pH varying from 4.18 for silage without hay to 4.38 for silages with 40% of the hay. The content of AN was higher for silages without hay (12.24%) and lowest in silages with 40% of the hay (1.40%). The silage without hay had presented lower buffering capacity (41.69 meq/100g of DM) and highest buffering capacity (52.45 meq/100g of MS), for silage with 40% of the hay. The silage without hay had lower DM (14.96%) and higher DM (43.84%) for silage with 40% of gliricidia hay. The CEL varying from 19.54% (40% of the hay) to 31.14% (without hay). The silage presented TC varying from 74.45% (40% hay) to 81.33 % (without hay). It can be concluded that the addition of gliricidia hay in the elephant grass silage improved the chemical composition, the physical parameters and the fermentation characteristics of the elephant grass silage. / Objetivou-se através desse trabalho, avaliar as características físicas, o perfil fermentativo e a composição química de silagem de capim-elefante com feno de gliricídia, utilizando-se mini-silos experimentais em delineamento inteiramente casualizado, com cinco tratamentos: 100% capim-elefante; 95% de capim-elefante com 5% de feno de gliricídia; 90% de capim-elefante com 10% de feno de gliricídia; 80% de capim-elefante com 20% de feno de gliricídia e 60% de capim-elefante com 40% de feno de gliricídia, com cinco repetições por tratamento. Foram determinados pH, nitrogênio amoniacal (NA), capacidade tampão (CT), massa específica (ME), massa específica seca (MES), produção de efluentes (PE), produção de gases (PG), recuperação de matéria seca (RMS), matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA), hemicelulose (HEM), celulose (CEL), lignina (LG), extrato etéreo (EE) e carboidratos totais (CHOT). A adição de feno de gliricídia nas silagens de capim-elefante causou efeito linear para as variáveis MS, MES e CT. Houve resposta quadrática para as variáveis ME, PE, RMS, MO, PB, FDN, HEM, LG e CHOT. As silagens apresentaram pH variando de 4,18 para silagens sem adição de feno a 4,38 para silagens com 40% de adição de feno. O teor de NA foi maior para silagens sem adição de feno (12,24%) e menor em silagens com 40% de adição de feno (1,40%). As silagens sem adição de feno apresentaram menor capacidade tampão (41,69 n.e.mg/100g MS) e as silagens com 40% de adição de feno apresentaram maior valor de capacidade tampão (52,45 n.e.mg/100g MS). As silagens sem adição de feno apresentaram menores MS (14,96%), enquanto que as silagens com 40% de adição de feno de gliricídia apresentaram maiores teores de MS (43,84%). Os teores de PB variaram de 5,36 % (sem adição de feno) a 8,20 % (40% de adição de feno). Com relação aos teores de FDN, observou-se que as silagens com adição 40% de feno apresentaram os menores teores de FDN (46,73%). Os teores de CEL variaram de 19,54% (40% de adição feno) a 31,14% (sem adição de feno). Os teores de CHOT das silagens variaram de 74,45% (40% de feno) a 81,33% (0% de feno). Com base nos resultados obtidos, pode-se concluir que a adição de feno de gliricídia na ensilagem do capim elefante melhorou a sua composição química, as características físicas e o perfil fermentativo das silagens.
116

Variáveis nutricionais e nictemerais de dietas com diferentes fontes de lipídeos em ovinos Santa Inês / Nutrition and variable diel diets with different lipid sources in sheep Santa Inês

Pereira, Marília Williani Filgueira January 2013 (has links)
PEREIRA, Marília Williani Filgueira. Variáveis nutricionais e nictemerais de dietas com diferentes fontes de lipídeos em ovinos Santa Inês. 2013. 55 f. : Dissertação (mestrado) - Universidade Federal do Ceará, Centro de Ciências Agrárias, Departamento de Zootecnia, Fortaleza-CE, 2013 / Submitted by Nádja Goes (nmoraissoares@gmail.com) on 2016-08-08T13:46:27Z No. of bitstreams: 1 2013_dis_mwfpereira.pdf: 754662 bytes, checksum: 16a9f7c8517b5939bbb6722075f141f6 (MD5) / Approved for entry into archive by Nádja Goes (nmoraissoares@gmail.com) on 2016-08-08T13:47:04Z (GMT) No. of bitstreams: 1 2013_dis_mwfpereira.pdf: 754662 bytes, checksum: 16a9f7c8517b5939bbb6722075f141f6 (MD5) / Made available in DSpace on 2016-08-08T13:47:04Z (GMT). No. of bitstreams: 1 2013_dis_mwfpereira.pdf: 754662 bytes, checksum: 16a9f7c8517b5939bbb6722075f141f6 (MD5) Previous issue date: 2013 / The aim of this study was to evaluate the inclusion of different fat sources in the diet of lambs over the intake and digestibility of dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), total carbohydrates (TC), non-fiber carbohydrates (NFC), total digestible nutrients (TDN) and metabolizable energy (ME), microbial production, nitrogen balance (NB), creatinine excretion and nictemeral pattern of feeding behavior. It was used 35 Santa Inês sheep with initial body weight of 13.00 ± 1.80 kg. The experimental design was randomized blocks. The experimental diets consisted of five treatments: the control diet without supplementation, added cottonseed (CAL), bran cashews (FCC), cottonseed meal plus cashews (CALFCC) and calcium salts of long chain fatty acids (CaAgCl). DM intake (kg/day, %PC and g/kg0.75) and nutrients (kg/day) did not change according to the inclusion of dietary lipids, with the exception of EE, NFC intake (kg/day) and NDF (%PC and g/kg0.75). The lipid supplementation influenced the nutrients digestibility, so that diets with CAL showed the lowest digestibility coefficients for DM, OM, NDF and CT (63.89, 64.41, 70.79 and 54.02%), respectively, when compared to the control diet. There was no difference between diets in relation to urinary volume, however the excretions of creatinine were influenced. The NB did not change with the inclusion of lipids, however, purine derivatives excretions (PD mmol/dia), purine derivatives absorption (PD abs. mmol/day), microbial nitrogen production (N microb mmol/day), microbial crude protein (CP microbial g/day) and microbial protein efficiency synthesis (ESPBmic (g)/kgNDT) were influenced by addition of dietary lipids, so that the lowest means for these variables were for diet supplemented with CaAgCl (3.48, 2.95, 2.14, 13.40, 21.31 mmol/day), respectively. The ruminating time (RT), number of chews (No/day), chews per bolus (No/bolus) are influenced in accordance with the addition of lipids in the diet, so that longer times have been expended for the CAL treatment (10,14, 78,91 and 61,026), respectively. The animals fed heavily at times on the periods of 06 to 12 and 12 to 18 h and ruminated in periods that comprised the intervals 18 to 24 and 24 to 06 h. Supplementation with different lipid sources did not influence the consumption of DM and nutrients, with the exception of EE and NFC intake but influences the digestibility of DM and nutrients. NB and urine volume are not affected according to the lipid inclusion in diets, however, the excretions of creatinine are influenced and microbial production is reduced when CaAgcl are part of the diet. The lipid supplementation influences diary cycle patterns on intake behavior in Santa Ines sheep. / O objetivo neste estudo foi avaliar a inclusão de diferentes fontes de lipídeos na dieta de cordeiros sobre o consumo e digestibilidade da matéria seca (MS), matéria orgânica (MO), proteína bruta (PB), extrato etéreo (EE), fibra em detergente neutro (FDN), carboidratos totais (CT), carboidratos não-fibrosos (CNF), nutrientes digestíveis totais (NDT) e energia metabolizável (EM); a produção microbiana; o balanço de nitrogênio (BN), as excreções de creatinina e os padrões nictemerais do comportamento ingestivo. Foram utilizados 35 ovinos da raça Santa Inês com peso médio inicial de 13,00 ± 1,80 kg, em delineamento experimental em blocos ao acaso, com cinco dietas experimentais (dieta controle, sem suplementação; dieta com caroço de algodão (CAL), com farelo de castanha de caju (FCC), com caroço de algodão mais farelo de castanha de caju (CALFCC) e com sais de cálcio de ácidos graxos de cadeia longa (CaAgCl). O consumo de MS (kg/dia, %PC e g/kg0,75) e dos nutrientes (kg/dia) não foram alterados com a inclusão de fontes lipídicas nas dietas, com exceção dos consumos de EE, CNF (kg/dia) e FDN (%PC e g/kg0,75). A suplementação lipídica influenciou a digestibilidade dos nutrientes, de modo que as dietas com CAL apresentaram os menores coeficientes de digestibilidade da MS, MO, FDN e CT (63,89; 64,41; 70,79 e 54,02%, respectivamente), quando comparado à dieta controle. Não houve diferença entre as dietas em relação ao volume urinário, no entanto as excreções de creatinina foram influenciadas. O BN não foi alterado com a inclusão de lipídeos, porém as excreções dos derivados de purina (DP mmol/dia), absorção dos derivados de purina (abs. DP mmol/dia), produção de nitrogênio microbiano (N mic mmol/dia), proteína bruta microbiana (PB mic g/dia) e eficiência de síntese de proteína microbiana (ESPBmic g/kgNDT) foram afetadas pela adição de lipídeos dietéticos, de modo que as menores médias para essas variáveis foram para a dieta suplementada com CaAgCl (3,48; 2,95; 2,14; 13,40; 21,31 mmol/dia, respectivamente). O tempo de ruminação (TR), o número de mastigações merícicas (n°/dia) e mastigações merícicas por bolo (n°/bolo) foram influenciados de acordo com as fontes lipídicas na dieta, de modo que os maiores tempos foram dispendidos para o tratamento CAL (10,14; 61026 e 78,91, respectivamente). Os animais consumiram preferencialmente nos horários que compreenderam os períodos de 06:00 às 12:00 e 12:00 às 18:00 hs e ruminaram nos períodos que compreenderam os intervalos 18:00 às 24:00 e 24:00 às 06:00 hs. A adição de diferentes fontes de lipídeos não influencia o consumo de MS e dos nutrientes, com exceção do consumo de EE e CNF, porém influencia os coeficientes de digestibilidade da MS e dos nutrientes. O BN e o volume urinário não são influenciados de acordo com a fonte de lipídeos da dieta, contudo as excreções de creatinina são influenciadas e a produção microbiana é reduzida quando CaAgcl fazem parte da dieta. A suplementação à base de caroço de algodão influencia os padrões nictemerais do comportamento ingestivo em ovinos da raça Santa Inês.
117

Evaluation of selected sweetpotato (Ipomoea batatas) accessions for drought tolerance

Omotobora, Babajide Olusegun 06 1900 (has links)
Sweetpotato (Ipomoea batatas) is a major staple food in Africa and the rest of the world where they are discovered to be a good source of carbohydrates, vitamin A, vitamin C and protein. The maximum production potential of the crop is being hampered by severe drought which ravages most parts of Africa. The main aim of this project therefore is to screen collected accessions of sweetpotatofor drought tolerance in a quick screening method with a view to identify cultivars that can perform well under water stress conditions. Fifty selected sweetpotato accessions consisting of cultivars and breeding lines collected from the ARC-VOPI gene bank were planted for drought screening in the glass house for 6 weeks during which water was withheld to induce stress. Observations were made on number of dead plants and days to wilting point, the results were analyzed and 12 best performing cultivars were selected for field trials. The field trial was carried out in Lwamondo, Thohoyandou for 6months under rain-fed conditions. The experiment was conducted in a complete randomized block design with 6 replicates.Yield data and growth parameters were collected every 8 weeks during the trial period and the data collected was analyzed using ANOVA. The best performing cultivars were Zapallo, Tacna, Ejumula, 2004-9-2 and Ndou. They were therefore recommended for further evaluation in other drought prone areas of the country. / Agriculture and  Animal Health / M. Sc. (Agriculture)
118

Growth and development of baby spinach (Spinacia oleracea L.) with reference to mineral nutrition

Nemadodzi, Lufuno Ethel 01 June 2015 (has links)
Baby spinach is a relatively new crop in South Africa with both commercial significance and reputed health benefits. It is known to assist in combating degenerative conditions associated with ageing, such as heart disease, cardiovascular disease, Alzheimer’s disease, cataracts and several forms of cancer. Three parallel NPK trials were conducted to investigate the effects of nitrogen (N), phosphorus (P) and potassium (K) on the growth and development of baby spinach. N and P treatments were arranged as (0, 45, 75, 105, 120 kg.ha -1 N and P), and K treatments were arranged as (0, 63, 85, 127, 148 kg.ha -1) in a randomised complete block designed with four replicates. Results showed that yield, dry matter, chlorophyll content and Leaf Area Index (LAI) were significantly increased by increasing the N application, while K had a significant effect on the LAI but not on yield, dry matter, chlorophyll content or stomatal conductance. Nitrogen treatments quadrupled fresh yield, dry matter and chlorophyll content, reaching maximum impact at 75 kg.ha-1 N. Phosphorus application showed significantly increased yields, dry matter and chlorophyll content, reaching maximum impact at 75 kg.ha-1 P. Therefore, to achieve optimum growth with N and P, 75 kg.ha-1 is recommended. The optimum rates of N, P and K were then used to formulate a NPK combined trial which was arranged as 0, 30:30:40, 45:45:60, 60:60:70, 75:75:90 kg.ha-1 in a randomised complete block design with three replicates. The results showed that maximum impact on yield, chlorophyll content, fresh and dry matter was achieved when combined NPK was applied at 45:45:60 / Agriculture and  Animal Health / M. Sc. (Agriculture)
119

Vliv různých způsobů obhospodařování na porostovou skladbu a produkci biomasy travního porostu / The influence of different way of grassland management on botanical composition and biomass production of grass stand

ŠOBROVÁ, Martina January 2014 (has links)
This thesis summarizes the results obtained from a study of long-term field trials with permanent grassland, which based on Faculty of Agriculture, University of South Bohemia in the České Budějovice between years 2010 - 2013. Permanent grasslands are managed in different ways (mowing, mulching, fallow) and the intensity of exploitation (harvested 1 - 3 times a year, fertilization). The work was focused on the evaluation of changes in growth composition, biomass production and dry matter content of hay variants. Also were evaluated biodiversityand grazing value of the crop stand. Before each harvest (mowing or mulching) was evaluated growth composition of experimental grasslands on an area of 20 m2. Plant species coverage of individual agro botanical groups was estimated by the reduced projective dominance (% D). Harvested biomass of grassland was considered and sample mown every variantof the experiment was dried (dry matter content). Species diversity was expressed as the number of species and species diversity was expressed in the form of Simpson's index. It was also calculated value describing the quality and productivity ofthe crop stand.
120

Produtividade, qualidade bromatológica e distinguibilidade de sementes de azevém submetidos a distintos cortes, doses e fontes de nitrogênio / Productivity, bromatological quality and distinguishability seed ryegrass submitted to different cuts, rates and sources of nitrogen

Bandeira, Andrieli Hedlund 23 February 2011 (has links)
Conselho Nacional de Desenvolvimento Científico e Tecnológico / The study aimed to evaluate the yield, chemical composition, yield and morphological characterization of seeds of annual ryegrass (Lolium multiflorum Lam) with two nitrogen sources: urea (nitrogen source most widely used and in Brazil, mainly in the south) and ammonium sulfate (source little used by producers, with virtually no loss by volatilization of nitrogen applied dressing), the nitrogen rate of zero, 100, 200, 300 and 400 kg ha- ¹, the agricultural year of 2009. Each treatment received one to three fresh cuts before the deferral for seed production in order to simulate a grazing situation, for ratings of productivity and chemical composition of pasture. The experimental design was randomized blocks. Based on the results did not differ between the sources used for the variables total dry matter, crude protein, acid detergent fiber, neutral detergent fiber, seed yield, number of spikelets per ear, ear length and spikelet number of seeds and length of seeds in three sections. The dose that gave the best response for most of the variables was 400 kg ha-¹ independent of nitrogen source used and the use of pasture with up to three cuts shows no decrease in quality and productivity of the same, but significantly affects the components of seed yield. Based on the variables may be concluded that there was no difference between the applied sources, then the ammonium sulfate had a similar response to urea can then be used as an alternative source of nitrogen. / O trabalho teve por finalidade avaliar a produtividade, composição bromatológica, rendimento e caracterização morfológica de sementes da forragem de azevém anual (Lolium multiflorum Lam.), com duas fontes de nitrogênio: uréia (fonte de nitrogênio mais difundida e utilizada no Brasil, principalmente no Sul do país) e sulfato de amônio (fonte pouco utilizada pelos produtores, com perda praticamente nula por volatilização de nitrogênio aplicado em cobertura), nas doses de nitrogênio (N) de zero, 100, 200, 300 e 400 Kg ha-¹, no ano agrícola de 2009. Cada tratamento recebeu de um a três cortes na matéria fresca antes do diferimento para a produção de sementes, a fim de simular uma situação de pastejo. O delineamento experimental adotado foi blocos ao acaso, seno quatro blocos e três repetições. Com base nos resultados obtidos não houve diferença estatística significativa entre as fontes de nitrogênio utilizadas para as variáveis: matéria seca total, proteína bruta, fibra detergente ácida, fibra detergente neutro, rendimento de sementes, número de espiguetas por espiga, comprimento de espiga e espigueta, número de sementes e comprimento de sementes. Em relação às doses, a dose de 400 Kg ha-¹ apresentou a melhor resposta para a maioria das variáveis estudadas e a utilização da pastagem com até três cortes não apresenta decréscimos na qualidade e produtividade da mesma, porém afeta significativamente os componentes do rendimento de sementes.

Page generated in 0.0946 seconds