Resumo

JIMENEZ, O.M.M. et al. Nutritive value of Brachiaria humidicola with organic and inorganic fertilization in acid soils. Arch. zootec. [online]. 2010, vol.59, n.228, pp.561-570. ISSN 1885-4494.

The objective of this study was to evaluate the effect of organic and inorganic fertilization on nutritive value of Brachiaria humidicola during three climatic seasons at the 21, 28 and 35 days old of growth. The study was carried out on grassland in acid soil. The main effects were climatic season (E), dry, rainfall and winter; kind of fertilizer (TF), without fertilizer, inorganic fertilizer (150-60-00 NPK) and organic fertilizer (15-4,8-8.4 NPK); age of harvest (21, 28 y 35 days) and their interactions. Three replicate were used by treatment. The response variables were crude protein (PD), digestibility in situ of the dry matter (DIMS), neutral detergent fiber (FDN) and digestibility of the FDN (DFDN). The main effects studied and their interactions affected (p<0.0001) the PD and DIMS of B. humidicola. The FDN was affected (p<0.05) by TF, age and the interactions TF x age and E x TF x age. The DFDN of B. humidícola only was affected (p<0.05) by E. In conclusion, the use of organic fertilizer on acid soil didn't increase the nutritive value of B. humidicola with respect to inorganic fertilizer through of one year of study and with different age of harvest. The digestibility of the dry matter and the neutral detergent fiber of B. humidicola were similar between organic fertilizer and without fertilizer.

Palavras-chave : Tropical grass; Compost; Crude protein; Digestibility; Acrisol; Humid tropic.

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