Teor de macronutrientes e produtividade da soja influenciados pela compactação do solo e adubação fosfatada

Abstract

The objective of this study was to evaluate the influence of compaction and phosphorus fertilization on the macronutrient tenor and productivity of soybeans in Chapada dos Parecis-MT. The study was conducted on Latossolo Vermellho, in a randomized block design, factorial 2x4x4 and three repetitions, two forms of phosphorus fertilization (broadcasted and groove), four doses of P2 O5 (0, 50, 100 and 150 kg ha-1) and four compaction levels (PT0, PT2, PT4 and PT8 – tillage with compression-induced tractor traffic at zero, two, four and eight strides, respectively). Compaction, the form of fertilizer and P2 O5 levels influenced the availability of phosphorus in the soil and the absorption of the element by the plant, and in the more compressed systems fertilized by throwing the P levels in soybeans were below the limits considered appropriate. The compaction reduced N, P, Ca and Mg and increased or K and S and P2 O5 doses increased the Mg content of the soybean shoot. Fertilization by throwing in compacted areas reduced the efficiency of phosphorus fertilization with consequent reduction in soybean yield.