Doses de calcários Filler e efeitos na fertilidade do solo, desenvolvimento e produção da soja

Abstract

This study aimed to evaluate the effects of doses from two limestones that were finely ground (calcite and dolomite) in soil chemical properties and soybean plants that were grown in the pots after application. The work was conducted in a greenhouse at the Federal University of Mato Grosso. Soil samples were collected in the layer 0-20 cm deep in native forest, whose soil is classified as Red-Yellow Dystrophic Latosol. The soil was sieved through a sieve of 4.0 mm and incubated with PRNT limestone equal to 86.71% to 93.57% calcite and to the dolomite, both of which were milled through sieve 0.30 mm before incubation, the experimental design was completely randomized (DIC) in a factorial 2x4 with four replications and the treatments consisted of two limestone (calcite and dolomite) and four doses: 0.0; 3.0; 6.0; 9.0 Mg ha-1. The plots consisted of plastic pots 10.0 dm3, maintaining the humidity at 80% of field capacity by weighing. After incubation at 90 days Soil samples were collected and analyzed, and the fertilization and subsequent seeding of soybean still held. At 105 days after sowing, the plants were harvested and again the soil sampled and analyzed. The results showed that doses influenced the values of all traits, and calcareous influenced Ca; Mg; Ca / Mg; CTC pH 7.0 and vegetative characteristics of plants as dry matter of root and shoot dry matter ratio /root dry matter. There was interaction between limestone X doses for Ca; Mg and the ratio Ca / Mg.