The objective of the thesis is proposing types of crops suitable for the production of phytomass for power purposes in low favourite areas (LFA). The assignment was summarising the source data for a broader set of power crops obtained from multiple authors primarily from the Czech Republic, and assessing their suitability for growing in LFA in areas sorted by environment requirements (soil, pH, weather conditions, vegetation period, resistance to frost, resistance to pests and diseases,{\dots}) and by production capability and energy parameters (yield, height of plants, combustion heat, caloric value, humidity, ash content, {\dots}) Field tests with suitable power crops were established and economic models were generated based on the results of the cultivation to demonstrate the possibilities of utilisation in reality

Submitted by Katiane Souza (katyane.souza@gmail.com) on 2016-05-18T00:29:32Z No. of bitstreams: 1 arquivototal.pdf: 2537217 bytes, checksum: fe78a73fb0c156a71b6fe77bdf9cd6aa (MD5) / Made available in DSpace on 2016-05-18T00:29:32Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2537217 bytes, checksum: fe78a73fb0c156a71b6fe77bdf9cd6aa (MD5) Previous issue date: 2009-07-09 / Currently, due to climate change, there is a major emerging trend to use agricultural products as substitutes for fossil fuels. We find then that the search for environmentally safe energy sources has become a focal point and where the incentive to use these sources of energy (especially biodiesel) is beginning to receive attention from federal, state and municipal levels of government. The physic nut (Jatropha curcas L.) is a multipurpose plant, a producer of oil (average of 37%) with all the qualities needed to be converted into biodiesel, making it noteble as a probable source as an alternative supply of raw material. This conclusion is based on the expectation that the plant has high concentration of vegetable oil, low cost of production, can be cultivated throughout the year, and can subsist in areas of limited rainfall and/or limited water sources. The objective of this study was to acquire information and a better understanding about the proper management techniques of cultured physic nut using mineral fertilization and appropriate time of pruning; which, in turn, should aid in the increased productivity and provide new technical information. The research was conducted at EMBRAPA-Algodão in the city of Campina Grande-PB, under conditions of natural environment. The soil used in the experiment was a Typic Regolithic and the treatments were formed by 4 doses of nitrogen fertilizer (urea) 0, 40, 80 and 120 kg ha-1 and 5 periods of pruning (0, 15, 20, 25 and 30 Insertions leaf). The variables studied for fresh phytomass epigeous were: stem height, stem diameter, number of leaves and leaf area. The variables for the dry mass were dry and epigeous hypogeal: dry leaves, stem and root. The use of the fertilization and pruning resulted in growth of phytomass and epigeous hypogeal with increases in height, stem diameter, number of leaves and leaf area of 111.54%, 19.43%, 714.00% and 424, 00%, respectively, and in increases dry the leaves, stem and root of 146.79%, 14.84% and 12.25% respectively, when compared to the plants which were not fertilized and not pruned. Based on research data, we can conclude that the physic nut responded very well to nitrogen fertilization resulting in significant gains in biomass and epigeous hypogeal when fertilized with urea at a dose of 80 kg ha-1 and pruning with 25 leaf inserts. Although the practice of pruning the plant helped increment gains in biomass epigeous and hypogeal in addition to obtaining a better crown, it was shown that this practice should only be implemented when combined with nitrogen fertilization. / Atualmente, devido às mudanças climáticas existe uma grande tendência emergente para o uso dos produtos agrícolas como substitutos dos combustíveis fósseis. Percebe-se então, que a procura por fontes de energia ecologicamente corretas passa por um cenário em destaque, onde o incentivo ao emprego destas fontes de energia (especialmente o biodiesel) começa a receber atenção especial dos governos federais, estaduais e municipais. O pinhão manso (Jatropha curcas L.) é uma planta de multiuso, produtora de óleo (média de 37%) com todas as qualidades necessárias para ser transformado em biodiesel, passando assim a ser divulgada como uma alternativa para fornecimento de matéria-prima, baseando-se na expectativa de que a planta tenha alta produtividade de óleo, baixo custo de produção, ser perene e ser persistente a seca. O objetivo desta pesquisa foi obter conhecimentos sobre o manejo cultural do pinhão manso em função da adubação mineral e época de podas, contribuindo para incrementar o seu cultivo e informações tecnológicas. A pesquisa foi conduzida na EMBRAPA-Algodão, na cidade de Campina Grande-PB, sob condições de ambiente natural. O solo utilizado no experimento foi do tipo Neossolo Regolítico e os tratamentos utilizados foram formados por 4 doses de adubo nitrogenado (uréia) 0, 40, 80 e 120 Kg ha-1 e 5 períodos de podas (0, 15, 20, 25 e 30 Inserções foliares). As variáveis estudadas para a fitomassa fresca epígea foram: altura caulinar, diâmetro caulinar, número de folhas e área foliar, e para a fitomassa seca epígea e hipógea: fitomassa seca das folhas, caule e raiz. O uso da adubação e poda proporcionou ganhos de crescimento da fitomassa epígea e hipógea tendo-se um incremento em altura, diâmetro caulinar, número de folhas e área foliar de 111,54%; 19,43%, 714,00% e 424,00%, respectivamente; e em fitomassa seca das folhas, caule e raiz de 146,79%; 14,84% e 12,25%, respectivamente, quando comparados ao tratamento não adubado e não podado. Com base dos dados experimentais pode-se concluir que o pinhão manso respondeu muito bem a adubação nitrogenada obtendo ganhos em sua fitomassa epígea e hipógea quando adubado com a uréia na dosagem de 80 Kg ha-1 e podado com 25 inserções foliares. Embora a prática da poda no pinhão manso tenha favorecido ganhos na fitomassa epígea e hipógea além da obtenção de uma melhor copa, ficou evidenciado que esta prática só deve ser realizada juntamente com uma adubação nitrogenada.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / In order to construct growth curves is necessary a sequence of many samples taken during lettuce growth period. However, mainly when the trial is made in a controlled environment, sampling frequency is limited. This work was carried out with the aim to reduce sampling destruction effect without change the result precision. Two field trials were made in a controlled environment, during two season, spring (09/20/2004 a 01/12/2005) and autumn (02/27/2005 a 07/20/2005), in the UFSM experimental area, Santa Maria, RS. Different sampling frequencies were simulated, using the adjust of diary sampling model. Optimum sampling frequency was made by comparing daily sampling model with simulated sampling model, in twos, by F test (p<0,005), using the error mean square of non linear regression analysis, pondered by freedom degrees. Simulations of the following variables: total, foliar, root and foliar area phytomass, were made just considering vegetative period and complete growth period. The result shows that season and period of growth should be taken into account to establish the best sampling frequency. Trials conducted during spring season, with complete growth period, show best results with samples taken in intervals of 3 (total), 8 (foliar), 20 (roots) and 9 (foliar area) days; with vegetative period, samples should be taken in intervals of 2,2,4 and 1 days. Trials conducted during autumn season, with complete growthperiod, the sample frequency should be of 2, 11, 12 and 11 days; and for vegetative growth, should be 2, 3, 4 and 1 days / Durante o crescimento da planta de alface é necessária uma seqüência de várias coletas de amostras até a maturação de colheita para construção de curvas de crescimento, porém, a freqüência em que se coletam amostras é limitada, principalmente quando o experimento é realizado em ambientes controlados. Para isso, buscou-se reduzir o efeito destrutivo de amostragens sem comprometer a precisão dos experimentos determinando-se a freqüência de amostragem de plantas de alface em hidroponia para o ajuste de curvas de crescimento. Foram realizados dois experimentos em estufa plástica nas estações de primavera e outono, no período de 20/09/2004 a 12/01/2005 e 27/02/2005 a 20/07/2005, respectivamente, em área pertencente ao Departamento de Fitotecnia, na UFSM, Santa Maria, RS. A partir do ajuste do modelo de amostragem diária, simularam-se diferentes freqüências de amostragem. Para encontrar a freqüência ideal de amostragem, foi comparado o modelo de amostragem diária com os modelos das diferentes amostragens simulados, dois a dois, pelo teste de F em nível de 5% de probabilidade de erro, utilizando-se os quadrados médios do erro da análise de regressão não linear, ponderados pelos respectivos graus de liberdade. Foram realizadas simulações considerando apenas o período vegetativo e ciclo completo (transplante até produção de sementes), para variáveis de fitomassa seca da planta e de partes da planta e área foliar. Em experimentos realizados com alface hidropônica na primavera, para o ciclo completo, devem ser realizadas amostragens a cada 3, 8, 20 e 9 dias para fitomassa seca relativa total da planta de alface, de folhas, de raiz e área foliar, respectivamente; enquanto que, para o período vegetativo, deve ser a cada 2, 2, 4 e 1 dias, respectivamente. Para o ciclo completo, utilizando-se as variáveis fitomassa seca relativa total, de folhas, de raiz e área foliar relativa em experimentos realizados no outono é recomendável utilizar freqüências de amostragens a cada 2, 11, 12 e 11 dias, respectivamente; e, para o período vegetativo, de 2, 3, 4 e 1 dias, respectivamente

The aim of my thesis was to compare selectid allotment, Botanical composition of allotmnet and prortion were monitored. Assessment of medium water content in soil. For parametrs of burning was to find number of fertile and sterile culm. In literal research are summarized common data about biomass and particular grass used for energetic purposes. Detailed description of reed canary grass and its description, agrotechnology and harvest. It is also important to mention processing of biomass in to the shape briquet and pelets. In the last part of research is description of burning device for used biomass. The practice part description to optain sample particular lokalities and these results and compares them.

The presented dissertation assesses the technological and economical use of high-pressure hydrolysis of wheat straw with sulfuric acid (H2SO4) for biogas producing. The theoretical part is focusing to the structure of lignocellulosis phytomass, on technology of mechanical treatment and acid hydrolysis. The experimental part is based on the production of neutralized hydrolyzate obtained by using technology of high-pressure hydrolyse by pressure 1,5 MPa, in retention time of 500 seconds and 190 °C. Data, generated by operation server Linode Platform Manager, emerges, that the area with the best polynormal cubic function, which is aproximated by the smallest mistake. The local extremes, where are the verification of the cumulative CH4 by anaerobic fermentation (in thermophilic area by temperature 51 °C) in relation on dry matter, are calculated of tha data obtained of Maple 14. The highest yeld of CH4 production was found by pressure of high-pressure hydrolyser 2,37 MPa. The maximum value of production of biogas (CH4) was 190 m3. t-1 of dry phytomass. Based on the optimalization, was maximum yeld of CH4 (of biochemical aspects) found about dry matter 8,57 % and pH 4,84. From the managerial point of view, which takes into account technological limitations and financial indicator, are the optimal conditions by dry matter from 3,92 to 5,12 % and a pH of 3,2 to 5,1.

The predicted increase in atmospheric temperatures is expected to affect the turnover of soil organic carbon in permafrost soils through modifications of the soil thermal regime. However, the tundra biome is formed of a mosaic of diverse landscape types with differing patterns of soil organic carbon storage and partitioning. Among these, differences in e.g. vegetation diversity and soil movements due to freeze-thaw processes are of main importance for assessing potential C remobilization under a changing climate. In this study, we described the storage of soil organic carbon (SOC) and the aboveground phytomass carbon in relation to geomorphology and periglacial features for two areas on Taymir Peninsula (Arctic Russia). An average of 29.5 kg C m-2, calculated by upscaling with a land cover classification, is stored in the upper soil meter at these two study sites. The mean C phytomass storage amounts to ca.0.406 Kg C m-2, or only 1.38% of the total SOC storage. The topography, at different scales, plays an important role in the carbon partitioning. High amounts of soil organic carbon are found in highland areas and within the patterned ground features found in peatlands. The highest amounts of aboveground phytomass carbon are found in deciduous shrubs and moss layers. The large variability in carbon distribution within land cover types among the sites reveals the challenge of upscaling the carbon storage values over the Arctic and thus highlight the necessity to carry out detailed field inventories in this region.

Submitted by Deyse Queiroz (deysequeirozz@hotmail.com) on 2018-05-28T12:36:02Z No. of bitstreams: 1 BENEDITO FERREIRA BONIFÁCIO - DISSERTAÇÃO PPGSA PROFISSIONAL 2017..pdf: 1746823 bytes, checksum: 153584fa740b169801030661903c2cb4 (MD5) / Made available in DSpace on 2018-05-28T12:36:02Z (GMT). No. of bitstreams: 1 BENEDITO FERREIRA BONIFÁCIO - DISSERTAÇÃO PPGSA PROFISSIONAL 2017..pdf: 1746823 bytes, checksum: 153584fa740b169801030661903c2cb4 (MD5) Previous issue date: 2017-03-03 / Tendo em vista a importância socioeconômica da cultura da goiabeira, notadamente para a região nordeste do Brasil onde há limitada disponibilidade de água de boa qualidade, surge a necessidade do uso de águas salinas para produção agrícola implicando na necessidade do desenvolvimento de estratégias que possam viabilizar o seu uso. Nesse sentido, realizou-se a pesquisa com o intuito de avaliar os efeitos de diferentes doses de potássio combinadas com águas de distintos níveis salinos na produção de mudas para porta-enxerto de goiabeira. O experimento foi desenvolvido em casa de vegetação do Centro de Ciências e Tecnologia Agroalimentar da Universidade Federal de Campina Grande, Pombal - PB. O delineamento experimental foi em blocos casualizados, num esquema fatorial 5 x 4, com os tratamentos referentes à cinco níveis de condutividade elétrica da água de irrigação (CEa = 0,3; 1,1; 1,9; 2,7 e 3,5 dS m-1) em interação com quatro doses de potássio (70, 100, 130 e 160% de K) sendo a dose recomendada de 100% K (726 mg de K dm-3 de substrato) para mudas de goiabeira e quatro repetições, sendo cada parcela constituída por duas plantas úteis. A aplicação dos tratamentos teve início aos 40 dias após a emergência das plântulas (DAE). Os porta-enxertos foram avaliados aos 120 e 225 DAE, através da altura da planta, diâmetro do caule, número de folhas e área foliar; no período de 60 a 225 DAE foram mensuradas as taxas de crescimento absoluto e relativo para altura de planta e, aos 225 DAE a área foliar específica, as variáveis de fitomassa seca de caule, folhas, seca de raiz, parte aérea, total, relação raiz/parte aérea, razão de área foliar e o índice de qualidade de Dickson. A irrigação com água de CEa de até 1,9 dS m-1 possibilitou a formação de porta-enxerto de goiabeira cv. Paluma com redução aceitável em seu crescimento; dose de potássio de 798,6 mg de K dm-3 de substrato promoveu o maior crescimento em altura do porta-enxerto de goiabeira cv. Paluma aos 120 dias após a emergência; doses crescentes de K não atenuaram os efeitos nocivos dos sais sobre os porta-enxertos de goiabeira cv. Paluma; dose de 508,2 mg de K dm-3 de substrato favorece o acúmulo de fitomassa seca de caules de goiabeira cv. Paluma aos 225 DAE; irrigação com água de CEa 1,9 dS m-1 promove redução aceitável de 10% sobre a produção de fitomassa e qualidade dos porta-enxertos de goiabeira cv. Paluma; não houve interação significativa (sal x doses de K) sobre as variáveis estudadas. / Considering the socioeconomic importance of the guava crop, especially for the northeastern region of Brazil where there is limited availability of good quality water, the need arises for the use of saline waters for agricultural production, implying the need to develop strategies that can their use. In this sense, the research was carried out to evaluate the effects of different doses of potassium combined with waters of different salt levels in the production of seedlings for guava rootstock. The experiment was carried out in a greenhouse at the Agrifood Science and Technology Center of the Federal University of Campina Grande, Pombal - PB. The experimental design was a randomized complete block design, in a 5 x 4 factorial scheme, with the treatments referring to five levels of electrical conductivity of the irrigation water (CEw = 0,3; 1,1; 1,9; 2,7 and 3,5 dS m-1) in interaction with four doses of potassium (70, 100, 130 and 160% K) and the recommended dose of 100% K (726 mg K dm-3 substrate) for guava seedlings and four repetitions, each plot consisting of two useful plants. The treatments were started at 40 days after emergence of the seedlings (DAE). The rootstocks were evaluated at 120 and 225 DAE, through plant height, stem diameter, number of leaves and leaf area; in the period from 60 to 225 DAE, absolute and relative growth rates were measured for plant height and, at 225 DAE, the specific leaf area, stem dry matter, leaves, root dry matter, shoot, total ratio root/shoot, leaf area ratio and Dickson quality index. Irrigation with CEw water of up to 1,9 dS m-1 allowed the formation of a guava rootstock cv. Paluma with acceptable reduction in its growth; potassium dose of 798,6 mg of K dm-3 substrate promoted the highest growth in height of the guava rootstock cv. Paluma at 120 days after the emergency; increasing doses of K did not attenuate the harmful effects of the salts on guava rootstocks cv. Paluma; dose of 508,2 mg of K dm-3 of substrate favors the accumulation of dry phytomass of cv. Paluma at 225 DAE; irrigation with CEw water 1,9 dS m-1 promotes a 10% acceptable reduction on the phytomass production and quality of guava rootstocks cv. Paluma; there was no significant interaction (salt x doses of K) on the studied variables.

Object of investigation – Svetus river basin. The purpose of reasearch – 1) to estimame the nurture of phytomass qantity in Svetus river basin, 2) to estimame formerly and newly formed plant community‘s botanic composition, it‘s change in diferent year seasons, and source of chage, 3) to estimame eatability do dominating grass, 4) to provide thr utilization of phytomass. The reasearch was carry out during the period 2003 – 2004. The method of reasearch – the phytomass was estimated by dry digging 50x50x20 monolith. The distance between two monolith –about 100 m., and it is about 30m from river centre. 24 monolith was digged every year (48 at all), which underground part of phytomass was taken from roots. The roots was washed, all plant parts was dryed and waighed (the weatherdry biomass was estimated). Over the period 2003-2004 the biggest amount of phytomass was in natural plant community (haying and grazing) – about 1503,5g/m2 (dry). In newly formed plant community, during 2 year period, the phytomass quantity was twice less than in formerly formed meadow plant community. The growing grass eatability in reasearched plant community was 6 points. The area of Svetus river basin – 36 ha. According two years informatikon, the increase of phytomass sutable for cattles was 118,98 t. The most sutable for second breedng.

Made available in DSpace on 2016-08-12T19:15:34Z (GMT). No. of bitstreams: 1 JeizaCM_DISSERT.pdf: 490536 bytes, checksum: 937d41b0f6174d8289051e96e70510a5 (MD5) Previous issue date: 2015-07-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Knowledge of a crop's growth rate and nutrient accumulation rate is very important for establishing a program of split applications of the recommended total nutrient rates. This study aimed to measure the rate of accumulation and export of dry matter and nutrients by a corn hybrid irrigated under the climatic conditions of the Apodi Plateau. An experiment was carried out in the field in the town of Quixeré, Ceará, Brazil, using the cultivar AG 1051. Ten treatments were applied, resulting from combinations between five rates of N (0, 45, 90, 160 and 220 kg ha-1) and four rates of P2O5 (0, 40, 80, and 120 kg ha-1). The experimental design was a randomized complete block with four replications. In this experiment, a benchmark treatment was chosen (90 kg ha-1 of N + 40 kg ha-1 of P2O5) for completion of sampling. The plants were sampled at 26, 33, 39, 47, 53, 61 and 71 days after sowing, and cut at ground level for evaluation of shoots. Ear and straw were separated at harvest. The following characteristics were evaluated: plant height, stem diameter and accumulation of N, P, K, Ca, Mg, S, B and Zn in the shoots. At the time of harvest at 71 days after sowing (DAS), the levels of these nutrients were also evaluated separately in the ear and in the remainder of the shoot of the plants. Stem diameter showed maximum value at 45 days after sowing (DAS); plant height showed a higher value at the end of the growing period, at 71 DAS. Accumulation of fresh and dry matter, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron and zinc showed higher values at 71 DAS. At the time of harvest, the descending order of nutrient accumulation in the shoots was: potassium > nitrogen > calcium > sulfur > phosphorus > magnesium > zinc > boron. In the ear, this order was: potassium > nitrogen > phosphorus > calcium > magnesium > sulfur > zinc > boron / O conhecimento da marcha de crescimento e de acúmulo de nutrientes de uma cultura é muito importante para o estabelecimento de um programa de parcelamento das doses totais recomendadas de nutrientes. Este trabalho teve como objetivo realizar a marcha de acúmulo e a exportação de matéria seca e de nutrientes por um híbrido de milho irrigado nas condições edafoclimáticas da Chapada do Apodi. Foi instalado um experimento em campo no município de Quixeré-CE, utilizando a cultivar AG 1051. Foram aplicados dez tratamentos resultantes de combinações entre cinco doses de N (0, 45, 90, 160 e 220 kg ha-1) e quatro doses de P2O5 (0, 40, 80, e 120 kg ha-1), no delineamento experimental de blocos ao acaso com quatro repetições. Neste experimento, foi escolhido um tratamento de referência (90 kg ha-1 de N + 40 kg ha-1 de P2O5) para realização das amostragens. As plantas foram amostradas aos 26, 33, 39, 47, 53, 61 e 71 dias após a semeadura, cortadas no nível do solo para avaliação da parte aérea e, por ocasião da colheita foram separadas em espiga e palhada. As características avaliadas foram: altura da planta, diâmetro de caule e acúmulo de N, P, K, Ca, Mg, S, B e Zn na parte aérea. Por ocasião da colheita aos 71 dias após a semeadura (DAS), também foram avaliados separadamente os conteúdos desses nutrientes na espiga e no restante da parte aérea da planta. O diâmetro do caule apresentou valor máximo aos 45 dias após a semeadura (DAS), a altura de planta apresentou maior valor no final do período de cultivo, aos 71 DAS, os acúmulos de matéria fresca e seca, assim como de nitrogênio, fósforo, potássio, cálcio, magnésio, enxofre, boro e zinco apresentaram maiores valores aos 71 DAS. Por ocasião da colheita, a ordem decrescente de acúmulo de nutrientes na parte aérea foi: potássio > nitrogênio > cálcio > enxofre > fósforo > magnésio > zinco > boro. Nas espigas, essa ordem foi: potássio > nitrogênio > fósforo > cálcio > magnésio > enxofre > zinco > boro

Made available in DSpace on 2016-08-12T19:18:51Z (GMT). No. of bitstreams: 1 JeizaCM_DISSERT.pdf: 490536 bytes, checksum: 937d41b0f6174d8289051e96e70510a5 (MD5) Previous issue date: 2015-07-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Knowledge of a crop's growth rate and nutrient accumulation rate is very important for establishing a program of split applications of the recommended total nutrient rates. This study aimed to measure the rate of accumulation and export of dry matter and nutrients by a corn hybrid irrigated under the climatic conditions of the Apodi Plateau. An experiment was carried out in the field in the town of Quixeré, Ceará, Brazil, using the cultivar AG 1051. Ten treatments were applied, resulting from combinations between five rates of N (0, 45, 90, 160 and 220 kg ha-1) and four rates of P2O5 (0, 40, 80, and 120 kg ha-1). The experimental design was a randomized complete block with four replications. In this experiment, a benchmark treatment was chosen (90 kg ha-1 of N + 40 kg ha-1 of P2O5) for completion of sampling. The plants were sampled at 26, 33, 39, 47, 53, 61 and 71 days after sowing, and cut at ground level for evaluation of shoots. Ear and straw were separated at harvest. The following characteristics were evaluated: plant height, stem diameter and accumulation of N, P, K, Ca, Mg, S, B and Zn in the shoots. At the time of harvest at 71 days after sowing (DAS), the levels of these nutrients were also evaluated separately in the ear and in the remainder of the shoot of the plants. Stem diameter showed maximum value at 45 days after sowing (DAS); plant height showed a higher value at the end of the growing period, at 71 DAS. Accumulation of fresh and dry matter, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron and zinc showed higher values at 71 DAS. At the time of harvest, the descending order of nutrient accumulation in the shoots was: potassium > nitrogen > calcium > sulfur > phosphorus > magnesium > zinc > boron. In the ear, this order was: potassium > nitrogen > phosphorus > calcium > magnesium > sulfur > zinc > boron / O conhecimento da marcha de crescimento e de acúmulo de nutrientes de uma cultura é muito importante para o estabelecimento de um programa de parcelamento das doses totais recomendadas de nutrientes. Este trabalho teve como objetivo realizar a marcha de acúmulo e a exportação de matéria seca e de nutrientes por um híbrido de milho irrigado nas condições edafoclimáticas da Chapada do Apodi. Foi instalado um experimento em campo no município de Quixeré-CE, utilizando a cultivar AG 1051. Foram aplicados dez tratamentos resultantes de combinações entre cinco doses de N (0, 45, 90, 160 e 220 kg ha-1) e quatro doses de P2O5 (0, 40, 80, e 120 kg ha-1), no delineamento experimental de blocos ao acaso com quatro repetições. Neste experimento, foi escolhido um tratamento de referência (90 kg ha-1 de N + 40 kg ha-1 de P2O5) para realização das amostragens. As plantas foram amostradas aos 26, 33, 39, 47, 53, 61 e 71 dias após a semeadura, cortadas no nível do solo para avaliação da parte aérea e, por ocasião da colheita foram separadas em espiga e palhada. As características avaliadas foram: altura da planta, diâmetro de caule e acúmulo de N, P, K, Ca, Mg, S, B e Zn na parte aérea. Por ocasião da colheita aos 71 dias após a semeadura (DAS), também foram avaliados separadamente os conteúdos desses nutrientes na espiga e no restante da parte aérea da planta. O diâmetro do caule apresentou valor máximo aos 45 dias após a semeadura (DAS), a altura de planta apresentou maior valor no final do período de cultivo, aos 71 DAS, os acúmulos de matéria fresca e seca, assim como de nitrogênio, fósforo, potássio, cálcio, magnésio, enxofre, boro e zinco apresentaram maiores valores aos 71 DAS. Por ocasião da colheita, a ordem decrescente de acúmulo de nutrientes na parte aérea foi: potássio > nitrogênio > cálcio > enxofre > fósforo > magnésio > zinco > boro. Nas espigas, essa ordem foi: potássio > nitrogênio > fósforo > cálcio > magnésio > enxofre > zinco > boro