Valor nutricional e características estruturais de gramíneas tropicais sob adubação nitrogenada

Castagnara, Deise Dalazen; Mesquita, Eduardo Eustáquio; Neres, Marcela Abbado; Oliveira, Paulo Sérgio Rabello de; Deminicis, Bruno Borges; Bamberg, R.

doi:10.21071/az.v60i232.3978

Cited by 8 publications

(10 citation statements)

References 17 publications

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“…This response probably occurred because the nitrogen of the conventional urea was released faster, and with this the loss of nitrogen by volatilization was higher, reducing the efficiency of nitrogen use by the plant. Castagnara et al (2011), evaluating tropical grasses, also observed a decreasing linear effect of nitrogen fertilizer doses on L/S ratio. PDTC: population density of tiller per clump; LM/DM: live material/dead material ratio; TFB: total forage biomass; GLB: green leaf biomass; GSB: green stem biomass; MSE: mean standard error; *: significant at p < 0.05.…”

Section: Resultsmentioning

confidence: 84%

Agronomic and nutritional responses of Carajas elephant grass fertilized with protected and non-protected urea

Alves

Carneiro

Edvan

et al. 2018

SCA

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The objective of this study was to assess the agronomic and nutritional responses of the elephant grass cultivar Carajas when subjected to fertilization with protected and conventional urea. A randomized block design with 4×2+1 factorial arrangement was adopted. The treatments consisted of four doses (100, 200, 400, and 800 kg N ha-1), two nitrogen sources (conventional and protected urea), and one additional treatment without fertilization. The experiment was carried out from October 2015 to March 2016, in a semi-arid region with a dystrophic yellow latosol type soil. The application of conventional urea was done with each of the multiple cuts performed per year, whereas the protected urea was applied in a single dose. Total senescence rate (TSR), leaf and stem elongation, height, tiller density, total forage biomass, green leaf and stem biomass, and dry matter all increased with increasing N doses. However, the phyllochron, live material/dead material ratio, and agronomic efficiency all decreased with N increasing dose. Plants fertilized with protected urea presented greater TSR and phyllochron. Mineral matter content was higher in plants fertilized with conventional urea. Neutral detergent fiber content was maximized at a dose of 437.63 kg N ha-1. The protected urea resulted in a higher value of leaf/stem ratio at the 400 kg N ha-1 dose, whereas ether extract and crude protein at the 800 kg N ha-1. With application of conventional urea, the highest crude protein value occurred at a dose of 100 kg N ha-1. The morphogenesis, structure, production, and chemical composition of elephant grass ‘Carajas’ were all positively influenced when nitrogen doses were increased, with the recommended optimal dose for use being 400 kg N ha-1 for both sources. The use of protected urea is recommended because of its slow release and need for only a single application.

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Section: Resultsmentioning

confidence: 84%

Agronomic and nutritional responses of Carajas elephant grass fertilized with protected and non-protected urea

Alves

Carneiro

Edvan

et al. 2018

SCA

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“…This variable is important because it allows for the evaluation of the increase in the proportion of leaves, which is a valuable variable for grazing livestock, and proportions of stems, both of which contribute to forage growth. Castagnara et al (2011) stated that the leaf:stem ratio is essential for animal nutrition, because it is associated with the ease of forage prehension. The decrease in leaf:stem ratio found in RP 28days caused by the increase in N level may be related to rapid plant development because of nitrogen.…”

Section: Resultsmentioning

confidence: 99%

Productivity of Urochloa brizantha ‘Marandu’ influenced by strategic rest periods and nitrogen levels

Rodrigues

Santos

Junior

et al. 2017

SCA

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The effects of two strategic rest periods and associated nitrogen levels on the agronomic and productive characteristics of Urochloa brizantha 'Marandu' were evaluated. The trial was conducted in a completely randomized 4 × 2 split-plot design, with four blocks. The treatments consisted of associations between two rest periods and four nitrogen levels. The rest periods included one at the end of 28 days (RP 28days ) and another when the canopy height was 40 cm (RP 40cm ) and nitrogen levels of 0, 150, 300, and 450 kg N ha -1 year -1 was applied as ammonium sulfate. The following variables were evaluated: rest period (RP) per cycle, total dry matter (TDM), dry matter (kg ha -1 ) and proportion (%) of leaf blade (LB), stem, and senescent material (SM), tiller mass, forage density, leaf area index, height, leaf:stem ratio, and crop growth rate (CGR). The variables height, TDM, LB dry matter, stem dry matter, CGR, and forage density exhibited a linear relationship with RP 28days and a quadratic relationship with RP 40cm with increasing N levels. The proportions of LB and stem had linear relationships with N levels for RP 28days and RP 40cm . The leaf:stem ratio was affected by increasing N levels and it fit the quadratic model for both rest strategies. The SM proportion had a quadratic relationship only with RP 28days . The tiller mass had a linear relationship with RP 28days , whereas SM dry matter showed a linear relationship for RP 40cm . The use of the RP 40cm reduced the period needed to begin a new grazing cycle. The level of 450 kg N ha -1 is recommended for RP 28days and levels between 380 to 400 kg N ha -1 provided better results for RP 40cm .apresentaram comportamento linear para PD 28dias e quadrático para o PD 40cm com crescentes doses de N. As proporções de LF e colmo apresentaram comportamento linear com as doses de N para PD 28dias e PD 40cm . A relação folha:colmo apresentou efeito com as doses de N, se enquadrando no modelo quadrático para ambos as formas de período de descanso. A proporção de MM apresentou comportamento quadrático somente no PD 28dias . A massa por perfilho apresentou efeito linear para o PD 28dias , enquanto a massa seca de MM apresentou efeito linear para o PD 40cm . O uso do PD 40cm permitiu reduzir o tempo de espera para o aproveitamento da forragem nas parcelas. A dose de 450 kg de N ha -1 é recomendada para o PD 28dias e doses entre 380 a 400 kg de N ha -1 permitiram melhores resultados para PD 40cm . Palavras-chave: Frequência de pastejo. Intervalo de pastejo. Pastejo rotativo.

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“…No aspecto técnico, muitos deles obtiveram maus resultados, especialmente econômicos. Alguns estudos atribuem o mau resultado ao não ajuste no manejo do pastejo na medida de aplicação da adubação ou aplicação de técnicas e estratégias de adubação (CASTAGNARA et al, 2011;MARTUSCELLO et al, 2006;MESQUITA;NERES, 2008;PACIULLO;GOMIDE;RIBEIRO, 1998)…”

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“…demonstraram que plantas adubadas com N (independente do método de pastejo adotado) atingem um número máximo de folhas por perfilho de forma precoce, o que resulta na diminuição na duração de vida das folhas, resultando em decréscimos na eficiência de utilização e produtividade do sistema de pastagem. Em contrapartida, para uma dada condição de ambiente favorável (regime pluviométrico e térmico adequados) o nitrogênio pode gerenciar o ritmo de crescimento das plantas forrageiras, aumentando a velocidade dos ciclos de renovação -folhas e perfilhos no pasto (ALEXANDRINO et al, 2004;CASTAGNARA et al, 2011;FRICKE;MCDONALD;MATTSON-DJOS, 1997)…”

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Almejando o mundo do futuro: a proposição de um modelo prospectivo global para produção e consumo sustentável de carne bovina

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Valor nutricional e características estruturais de gramíneas tropicais sob adubação nitrogenada

Cited by 8 publications

References 17 publications

Agronomic and nutritional responses of Carajas elephant grass fertilized with protected and non-protected urea

Agronomic and nutritional responses of Carajas elephant grass fertilized with protected and non-protected urea

Productivity of Urochloa brizantha ‘Marandu’ influenced by strategic rest periods and nitrogen levels

Almejando o mundo do futuro: a proposição de um modelo prospectivo global para produção e consumo sustentável de carne bovina

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