Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-08-23T19:01:51Z No. of bitstreams: 1 2016 - Aline Barros da Silva.pdf: 2200971 bytes, checksum: c03b52ff6176469c08ca932517eebdbe (MD5) / Made available in DSpace on 2017-08-23T19:01:51Z (GMT). No. of bitstreams: 1 2016 - Aline Barros da Silva.pdf: 2200971 bytes, checksum: c03b52ff6176469c08ca932517eebdbe (MD5) Previous issue date: 2016-08-19 / CAPES / The search for the best efficiency in the nitrogen fertilization justifies the need in the evaluation in nitrogen (N) sources and doses what promote lower losses in the ambient, beyond higher productivity and quality of the forage produced. In that contest, this study aimed to evaluation the morphological composition, structural characteristics and nutritional value of the Panicum maximum cv. Massai forage, cultivated under urea sources (common and coated Policote?) and N doses (200, 400 e 600 kg ha-1 year-1), during autumn, winter and spring 2014, summer and autumn 2015 seasons. The experiment was conducted in UFRRJ, Serop?dica/RJ, under a complete block randomized design with four replications in a factorial arrangement (3x2) + 1. The variance analysis of data was performed using the PROC MIXED of the SAS? (9.2 version), a 5% probability. The means of treatments were compared using PDIFF (p<0.05), and the quantitative effects using a PROC REG of SAS? (probability<0.05). There was interaction (p<0.05) between doses, sources of urea, and seasons for the forage mass (FM), percentages of leaf blades (LBDMP), stem (SDMP) and dead material (DMDMP) dry matter, leaves blades: steams ratio (LBSR), forage accumulation rate (FAR), nitrogen use efficiency (NUE), and for dry matter (DM) and crude protein (CP) content of the forage. Since the canopy height (CH), tiller population density (TPD), weight per tiller (WT) and forage bulk density (FBD), mineral matter (MM) and insoluble neutral detergent fiber (NDF) contents of the forage varied (p<0.05) due to N rates and seasons interaction. There was a linear increased in the FM with increasing of N doses until to the 600 kg ha-1 yr-1 level in the winter and spring seasons by both urea sources. The increasing N doses promoted higher LBDMP and lower SDMP and DMDMP of the FM, besides providing increased TPD, FBD and FAR of the massai grass forage, during all seasons studied. There was a quadratic positive effect for NUE during autumn 1, spring, summer and autumn 2 for common and coated urea, with higher maximum points for coated urea. And during the winter there was a positive linear effect only for coated urea. Higher average values of the CP were verified on the spring (11.76%), and lower on the autumn/winter (9.15%), and the use of coated urea providing higher CP levels of the forage than common urea in all seasons (10.40% and 9.41% general average, respectively). The CP content increased linearly with the increase of N levels in all seasons, while the NDF reduced linearly with increasing of these levels, except for the fall season 2 (there was not effect for N dose - p>0.05). Intensification of nitrogen fertilization favors the leaf blades participation in the forage mass, benefiting the structural characteristics, the forage accumulation, and the nutritional value of Massai grass. Coated urea promotes greater NUE during all seasons of the year. / A busca pela melhor efici?ncia da aduba??o nitrogenada justifica a necessidade da avalia??o de fontes e doses de nitrog?nio (N) que promovam menores perdas para o ambiente, al?m de maior produtividade e qualidade da forragem produzida. Nesse contexto, objetivou-se avaliar a composi??o morfol?gica, as caracter?sticas estruturais e o valor nutricional da forragem do Panicum maximum cv. Massai, cultivado sob fontes de ureia (comum e revestida por Policote?) e doses de N (200, 400 e 600 kg ha-1 ano-1), durante as esta??es de outono, inverno e primavera de 2014, ver?o e outono de 2015. O Experimento foi conduzido na UFRRJ, Serop?dica/RJ, sob delineamento de blocos completos casualizados em arranjo fatorial (3x2) + 1, com quatro repeti??es. Para an?lise de vari?ncia dos dados utilizou-se o PROC MIXED do SAS? (vers?o 9.2), a 5% de probabilidade. As m?dias dos tratamentos foram comparadas pela PDIFF (p<0,05), e os efeitos quantitativos pelo PROC REG do SAS? (p<0,05). Houve intera??o (p<0,05) entre doses, fontes de ureia, e esta??es do ano para massa de forragem (MF), porcentagens de massas secas de l?minas foliares (PMSLF), de colmos (PMSC), e de material morto (PMSMM), rela??o l?mina foliar: colmo (RLFC), taxa de ac?mulo de forragem (TAF), efici?ncia da utiliza??o do nitrog?nio (EUN), e para os teores de mat?ria seca (MS) e prote?na bruta (PB) da forragem. J? a altura (ALT) dos doss?is, densidade populacional de perfilhos (DPP), peso por perfilho (PP) e densidade volum?trica da forragem (DVF), bem como os teores de mat?ria mineral (MM) e de fibra em detergente neutro (FDN) da forragem variaram (p<0,05) com a intera??o entre dose de N e esta??o do ano. A MF aumentou linearmente com a aduba??o nitrogenada at? a dose de 600 kg ha-1 ano-1 de N nas esta??es de inverno e primavera para ambas as fontes de ureia. Maiores doses de N promoveram maiores PMSLF e menores PMSC e PMSMM na MF, al?m de proporcionar maiores DPP, DVF e TAF do capim-massai, durante as esta??es estudadas. Houve efeito quadr?tico positivo para EUN durante o outono 1, primavera, ver?o e outono 2 para ureia comum e revestida, com maiores pontos de m?ximo para ureia revestida, e durante o inverno houve efeito linear positivo somente para ureia revestida. Maior valor m?dio de PB foi verificado na primavera (11,76%), e menor no outono/inverno (9,15%), e o uso da ureia revestida promoveu maiores teores de PB na forragem que a ureia comum em todas as esta??es (m?dias gerais de 10,40% e de 9,41%, respectivamente). O teor PB aumentou linearmente com o incremento de doses de N em todas as esta??es, enquanto que os teores de FDN reduziram linearmente com aumento dessas doses, exceto para a esta??o outono 2 (n?o houve efeito de dose de N ? p>0,05). A intensifica??o da aduba??o nitrogenada favorece a participa??o de l?minas foliares na massa de forragem, beneficia as caracter?sticas estruturais, o ac?mulo de forragem, e o valor nutricional do capim-massai. O uso de ureia revestida promove maior EUN durante todas as esta??es do ano.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T13:30:29Z No. of bitstreams: 5 1.pdf: 759671 bytes, checksum: 1f3560e9506658bab885766f9f65fd21 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T14:09:52Z (GMT) No. of bitstreams: 5 1.pdf: 759671 bytes, checksum: 1f3560e9506658bab885766f9f65fd21 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) / Made available in DSpace on 2015-02-27T14:09:52Z (GMT). No. of bitstreams: 5 1.pdf: 759671 bytes, checksum: 1f3560e9506658bab885766f9f65fd21 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) Previous issue date: 2010 / Objetivou-se com este trabalho avaliar os efeitos de diferentes aduba??es de solo e doses de N em cobertura na cultura da alface. O experimento foi realizado no campus JK da UFVJM, em Diamantina/MG, no per?odo compreendido entre junho e setembro de 2008. O delineamento experimental utilizado foi em blocos ao acaso com parcelas subdivididas, com tr?s blocos, cinco aduba??es de solo: NPK+esterco, NPK, esterco, composto org?nico e vermicomposto e cinco doses de N em cobertura, sendo a parcela experimental constitu?da por dezesseis plantas, espa?adas em 0,30 m x 0,30 m. Foram avaliados a massa seca e fresca da parte a?rea, di?metro da cabe?a, n?mero de folhas, altura de plantas, vari?vel can?nica e teores foliares de N, P, K, Ca, MG, S, B, Cu, Fe, Mn e Zn. As vari?veis de produ??o foram afetadas pelo tipo de aduba??o de solo e pelas doses de N aplicadas em cobertura. A aduba??o com esterco foi a que proporcionou os melhores resultados para as caracter?sticas de produ??o avaliadas, seguida das aduba??es com NPK+esterco e vermicomposto. Para o cultivo da alface na regi?o de Diamantina/MG, recomenda-se aplicar 160 kg.ha-1 de N em cobertura. O processo de vermicompostagem reduziu os teores de B, Cu, Fe e Mn na parte a?rea das plantas de alface. Os teores dos nutrientes nas plantas de alface variaram em fun??o da aduba??o de solo e das doses de nitrog?nio em cobertura, o que mostra que, com o aumento das doses de N, houve aumento nos teores foliares dos nutrientes analisados, exceto para o B, Cu e Zn. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2009. / ABSTRACT The objective of this study was to evaluate the effects of different soil fertilization and nitrogen rates in coverage on lettuce cultivation. The experiment was accomplished on JK campus of UFVJM, Diamantina/MG, in the period between June and September of 2008. The experimental design was a randomized block with split plot with three blocks and five fertilization of soil: NPK + manure, fertilizer, manure, organic compost, vermicompost and five doses of nitrogen in coverage, considering that the experimental plot was composed of sixteen plants spaced by 0.30 m x 0.30 m. The dry and fresh weight, head diameter, leaf number, plant height, canonical variable and foliar contents of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn were evaluated. The growth variables were affected by the type of soil fertilization and N rates applied in coverage. The manuring was the one that provided the best results for the evaluated growth features, followed by fertilization with NPK+manure and vermicompost. For the lettuce cultivation in the region of Diamantina/MG, it is recommended to apply 160 kg.ha-1 N in coverage. The vermicomposting process reduced the B, Cu, Fe and Mn content in lettuce weights. The nutrient contents in lettuce plants varied according to soil fertilization and nitrogen dosage in coverage, which shows that with increasing doses of N, there was an increase in the analyzed foliar nutrients, except for the B, Cu and Zn.

Made available in DSpace on 2016-04-28T14:59:49Z (GMT). No. of bitstreams: 1 Rosani Valeria M Matoso Silva.pdf: 2493800 bytes, checksum: c274b76a31f58fe821a3f98f2cabee11 (MD5) Previous issue date: 2009-12-16 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The purpose of this work was to evaluate the nutritional value of Tifton 85 (Cynodon spp) in response to nitrogen fertilization, in terms of bromatological composition and the nitrogen and carbohydrate fractions as defined by the Cornell University model. It also assessed the performace of a chlorophyll meter, as an indirect estimate of green dry matter production, and chemical bromatological traits fo the grass. This study was carried out during the period of november 2008 to january 2009, on Haplic Planosol at the campus of the Rural Federal University of Rio de Janeiro. Experimental design was a randomized block desing with four repetitions. Main treatments consisted of N rates allocated in the plots and cutting number were allocated in the sbplots. There are three levels of N soil : low N; represented by soil N, medium N: 75 N / ha / cut, and high N: 150 kg N / ha / cut. Herbage harvested twice, the first on November 30 and the second 29 days later. Cutting dates were determined according to data from canopy light interception. In the first study results showed that N rates increased green dry matter and the crude protein CP per cent in the forage and decreased asid detergent fibrous fraction contents. It was also verified the feasibility of using a chlorophyll meter as a probe for CP content and forage availability. In a second study it was verified that N fertilization showed no consistent results in regard to crude protein fractions with the sole exception of C fraction (%CP), that increased with increasing N availability. / Objetivou-se com este experimento avaliar o valor nutritivo do capim Tifton-85 (Cynodon spp) em resposta ? aplica??o de diferentes n?veis de nitrog?nio (N), com base na composi??o qu?mico bromatol?gica e nas fra??es nitrogenadas e de carboidratos, utilizando-se o sistema desenvolvido na Universidade de Cornell (The Cornell Net Carbohydrate and Protein System - CNCPS). Avaliou-se tamb?m o desempenho de um clorofilometro, como estimador indireto das disponibilidades de forragem, e das caracter?sticas qu?mico bromatol?gicas do capim. O experimento foi realizado durante o per?odo novembro de 2008 a janeiro de 2009, no campus da Universidade Federal Rural do Rio de Janeiro, utilizando-se um Planossolo H?plico. Os tratamentos constitu?ram-se de doses de N, na forma de ur?ia e de n?mero de cortes. Foram definidos tr?s n?veis de N: baixo, representado pelo N do solo; m?dio: 75 de N/ha/corte; e alto: 150 kg de N/ha/corte. Foram realizados dois cortes, o primeiro em 30/11/2008 e o segundo 29 dias ap?s. As datas dos cortes foram determinadas de acordo com dados de intercepta??o luminosa dos doss?is. O delineamento experimental foi em blocos casualizados, com quatro repeti??es, em esquema de parcelas subdivididas, com as doses de N alocadas nas parcelas e a seq??ncia de cortes na subparcela. No primeiro estudo, verificou-se que a aduba??o nitrogenada aumentou a produ??o de massa verde seca e os teores de PB da forragem e reduziu os teores das fra??es fibrosas em detergente ?cido, mostrando ainda a factibilidade do uso do clorofil?metro como um estimador indireto da produ??o de forragem e dos teores de PB na mesma. No segundo estudo, verificou-se que a aduba??o nitrogenada n?o apresentou resultados consistentes quando relacionada ?s fra??es prot?icas e nitrogenadas, com a exce??o da fra??o C (%PB) que respondeu positivamente.