dehydratation rate and chemical composition of stargrass (cynodon nlemfuensis vanderyst) hay as a function of nitrogen fertilization/
taxa de desidratação e composição químico-bromatológica do feno de grama-estrela (cynodon nlemfuensis vanderyst) em função de níveis de adubação nitrogenada

Clicks: 235
ID: 230870
2007
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Abstract
The objective of this study was to determine the dehydratation rate of after-harvest forage in the field conditions and to evaluate the chemical composition as a function of nitrogen fertilization. It was used two fertilization levels (50 and 100 kg/N/ha) and forage was harvest with 28 days growth. During field wilting, one sample at harvest time and seven others after it were collected to determine the dehydratation rate of the whole plant and the leaf and stem fractions. A completely randomized experimental design with ten replications was used, and the chemical composition data were compared by F Test (5%). The water loss rate was higher for leaf when compared to stem fraction, showing the same pattern for both fertilization levels. In chemical composition evaluations, crude protein (CP) was different (P0.05). In vitro dry matter digestibility (INDMD) and in vitro crude protein digestibility (INCPD) were not affected (P>0.05) by the levels of nitrogen fertilization. Nitrogen fertilization increased the CP concentration in Stargrass hay, but did not affect the fiber fraction, not increasing the nutritional quality of hay.

O objetivo do trabalho foi determinar a taxa de desidratação da forragem após o corte, em condições de campo e avaliar a composição química em função da adubação nitrogenada. Utilizou-se dois níveis de adubação (50 e 100 Kg/N/ha) com o corte realizado após 28 dias de crescimento. Durante o período de secagem a campo foram realizadas amostragens no momento do corte e mais outras sete após o corte, para determinar a taxa de desidratação da planta e das frações folha e colmo. O delineamento experimental foi inteiramente casualizado com dez repetições e os dados de composição química, comparados pelo teste F (5%). A velocidade de perda de água foi maior para a folha comparada ao colmo, mostrando o mesmo padrão para os dois níveis de adubação. Na avaliação da composição química, a PB diferiu (P0,05) para o nível de nitrogênio. Da mesma forma, para a DIVMS e DIVPB não houve efeito (P>0,05) entre os níveis de adubação nitrogenada. A adubação nitrogenada proporcionou aumento no teor de PB do feno de grama-estrela, porém não afetou os componentes da fibra, não resultando em aumento na qualidade nutricional do feno.

Reference Key
canto2007semina:dehydratation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Marcos Weber do Canto;Clóves Cabreira Jobim;Moysés Calixto Júnior
Journal frontiers in neuroendocrinology
Year 2007
DOI
10.5433/1679-0359.2007v28n3p493
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/2992
Keywords
Agriculture (General) fibra

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