Sistemas de preparo do solo e de semeadura no rendimento de grãos de soja em área de várzea

Abstract

The presence of soil compaction next to the soil surface and the variability of soil chemical properties can affectthe soybean yield. The objective was to evaluate the influence of soil tillage systems and seeding on two sites area (cut and fill) onsoybean grain yield. The experiment was conducted in lowland areaof the Federal University of Santa Maria in 2013/14 and 2014/15harvest. The design was a randomized block with four replications,with split plots. The main plots: the cuts area (A1) and fills area(A2). The subplots were tillage systems and seeding: deep tillage(D1); planter using shank (D2); planter using double disc (D3).The cultivar used was BMX Tornado and sowing on November 26and 14 from 2013 and 2014, respectively. The treatment with deeptillage and planter using shank reduced the penetration resistanceand provided greater content of Mg and S on 2013/14 and N, P,K, Ca, Mg e S on 2014/15. Those systems enables higher soybeanyield, without difference between cut and fill area.