Arad natural phosphate and lime and the growth of Brachiaria brizanta yellow latosol degraded pasture in the Amazon

Abstract

Pasture degradation in the Amazon has been a problem of great
environmental impact, it has led to increased deforestation of native forests.
The objective of this research was to estimate the dry matter production of shoot, root and
tillering of Brachiara Brizantha, according to Arad Rock phosphate in the presence and
absence of liming, as well as agronomic efficiency in Oxisol under pasture
degraded Amazon. The research was conducted in the greenhouse of the Institute of Sciences
Agrarian the Federal Rural University of Amazonia. The soil was collected in an area with grazing Braquiarão with over 15 years of use. The experimental design was completely randomized in a 4x4x2 factorial design with three replications and additional treatment
with soluble source (triple superphosphate), the factors being four doses of phosphorus (0, 50, 100 and 150 mg dm-3 of P2O5), using as a source of P Arad phosphate rock (33% P2O5) in the absence and in the presence of limestone for four cuts. The doses of natural phosphate Arad showed significant effects on dry weight of shoot and root and tiller number. The natural Arad phosphate was more effective for dry matter production than triple superphosphate from the second cut
forage, with or without a soil amendment.