Forage nutritive value in crop-livestock-forestintegrated systems under tree management.
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The objective of this study was to evaluate the nutritive value of pastures in agroforestry systems after trees thinning. The experiment was carried out from October 2016 to March 2018 at Embrapa Southeastern Livestock, in São Carlos, SP, Brazil. The experiment was composed by pastures of palisade grass (Urochloa brizantha ?BRS Piatã?), under rotational stocking, in four systems: intensive (INT); crop-livestock (iCL), in which pasture was renewed annually with corn sowed simultaneously with palisade grass; livestock-forest (iLF); and crop-livestock-forest (iCLF). In the iLF and iCLF systems, eucalyptus trees (Eucalyptus urograndis clone GG100) were planted in April 2011, in single rows, with 15×2m spacing. In 2016, the trees were thinned, and the spacing was changed to 15×4m. Forage samples were obtained during six grazing cycles and crude protein (CP) and in vitro digestibility (IVDMD) were determined. The data were submitted to analysis of variance and comparison of means by the Tukey test (5%). The results showed the highest levels of CP for iLF and iCL (12.37, and 10.96%, respectively); for IVDMD there was no significant difference. It can be concluded that the pastures in the systems with trees showed higher nutritional value after the tree thinning.
Palabras clave
Crop livestock forest, ILPF, Eucalyptus, Crude protein