Sistemas de manejo do solo e velocidade de semeadura na cultura do milho

Abstract

The quality of sowing allied to the proper management of the soil are indispensable factors aiming the good establishment of the corn crop, as well as the development and satisfactory yield indexes. The objective of this study was to evaluate soil management systems and sowing speeds on agronomic characteristics, longitudinal distribution of corn crop and soil resistance to penetration. The experiment was carried out at FAECA - Experimental Farm of Agrarian Sciences of the Federal University of Grande Dourados - UFGD, using a randomized complete block design with four replications. The soil management systems were: without mobilization, subsoiling at 0.35 m, subsoiling at 0.35 m plus the destroying grader, 0.35 m cross-subsoiling plus a destroying grader, destroying grader, plowing at 0.40 m with moldboard plow followed by two grader-leveling harrows. And the sowing speeds were: 3.1; 5.1; 5.8; 7.9 km h-1. Soil resistance to penetration and plant height, stem diameter, first ear height, final stand, longitudinal distribution of plants in normal, faulty and double spacing, as well as 1000 grain mass and yield were evaluated. Soil management systems and sowing speeds did not influence soil resistance to penetration, as well as agronomic characteristics and longitudinal distribution of corn crop, thus suggesting no soil mobilization associated with higher sowing of corn (7 ,9 km h-1). The soil of the experimental area was a dystroferric Red Latosol.