Variabilidade espacial de atributos do solo e características do capim mombaça em sistema rotacionado com búfalas na Amazônia Oriental.

Abstract

Intensive and inadequate management of pastures over the years implies conditions unfavorable to the quality and structuring of the soil and consequently the supply of fodder to the animal. Nowadays, precision animal husbandry has been adopted with the adoption of geostatistics as a tool to aid in the study of these changes to obtain a more profitable livestock. The objective of this study was to evaluate the spatial variability of soil attributes and forage characteristics in grazing under a rotational system in the Eastern Amazon. The study was carried out in the city of Parauapebas, Southeastern region of Pará, in a pasture cultivated with forage Panicum maximum (Jacq.) Cv. Mombaça, in a rotational grazing system with buffaloes, implanted five years ago. To collect the data, a sample grid with a spacing of 10 x 10 m was installed, totaling 392 points distributed in 34.300 m2. Soil attributes were evaluated at 0.0-0.4 m depth subdivided into four 0.1 m layers. The variables evaluated were soil mechanical resistance to penetration (RMSP), soil water content (TAS), soil hydrogenation potential (PH), forage height (AF) and number of tillers (NP). It was concluded that the RMSP and the TAS presented a moderate to strong spatial dependence structure, adjusting to the Exponential and Spherical models. In the spatial dependence criterion, NP presented predominantly strong dependence and fit to the Gaussian model. In the points with higher values of RMSP there was a reduction in TAS and a predominance of pH with value six, without compromising the characteristics of the forage AF and NP.