morfofisiologia e valor nutritivo do capim-braquiária sob sombreamento natural e a sol pleno morphophysiology and nutritive value of signalgrass under natural shading and full sunlight
morfofisiología y valor nutritivo del pasto braquiaria bajo sombreado natural y a pleno sol morfofisiología y valor nutritivo del pasto señal bajo sombreado natural y a pleno sol
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Abstract
The objective of this trial was to evaluate the morphophysiological traits and nutritive value of Brachiaria decumbens, during 2003 and 2004 rainy seasons, in a silvopastoral system, with grass alone (30 m width), alternated with grass plus trees (Acacia mangium, A. angustissima, Mimosa arthemisiana, Leucaena leucocephala x L. diversifolia, Eucalyptus grandis) strips (10 m width). The experimental design was a randomized block arranged in a split plot design (morphophysiological traits) or split-split plot (nutritive value traits), and replicated four times. The level of shading was 65% of incident radiation out of the wood in 2003, and 35% in 2004 after harvesting of some Eucalyptus trees. Under shade, tiller population leaf area and forage mass index were higher in the second year than in the first. Forage neutral detergent fiber value was higher at full sunlight than in the shade, while the crude protein content and in vitro dry matter digestibility were higher under the trees. Moderate shading increases crude protein and reduces neutral detergent fiber, therefore improving forage digestibility of grasses growing under trees.
El objetivo de este ensayo fue evaluar los rasgos morfofisiológicos y el valor nutritivo de Brachiaria decumbens, durante las estaciones lluviosas de 2003 y 2004, en un sistema silvopastoril con franjas de solo gramínea (30 m de ancho), alternadas con franjas de gramínea más árboles (Acacia mangium, A. angustissima, Mimosa arthemisiana, Leucaena leucocephala x L. diversifolia, Eucalyptus grandis) (10 m de ancho). El diseño experimental fue de bloques al azar dispuestos en parcelas divididas (rasgos morfofisiológicos) o parcelas subsubdivididas (rasgos de valor nutritivo), con cuatro repeticiones. El nivel de sombreamiento fue del 65% de la radiación incidente fuera del bosque en 2003, y del 35% en 2004, tras la corta de algunos árboles de eucalipto. Bajo sombra, la población de macollos, el índice de área foliar y la masa de forraje fueron mayores en el segundo año que en el primero. El valor de fibra detergente neutro del forraje fue mayor a pleno sol que a la sombra, mientras que el contenido de proteína bruta y la digestibilidad in vitro de la materia seca fueron mayores bajo los árboles. El sombreamiento moderado incrementa la proteína bruta y reduce la fibra detergente neutro, mejorando así la digestibilidad del forraje de las gramíneas que crecen bajo los árboles.
| Reference Key |
paciullo2007pesquisamorfofisiologia
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|---|---|
| Authors | ;Domingos Sávio Campos Paciullo;Carlos Augusto Brandão de Carvalho;Luiz Januário Magalhães Aroeira;Mirton José Frota Morenz;Fernando César Ferraz Lopes;Roberto Oscar Pereyra Rossiello |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 2007 |
| DOI |
10.1590/S0100-204X2007000400016
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| URL | |
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