Mapeamento da semeadura de soja

Abstract

In order to have a satisfactory plant stand and as a result agricultural productivity it is necessary to make an evaluation of the quality of the sowing. The objective was to evaluate and map the stand and the distribution of plants in the soybean crop. Data were collected at the Experimental Farm of Agricultural Sciences of the Federal University of Grande Dourados, in an area of 16, 34 hectares, where 87 sampling points were collected, and at each point 3 replications were performed. The quality of sowing was evaluated, to be able to indicate the necessity or not of management and adjustments in the sowing operation. Statistical and geostatistical statistical tools were used, which served as a subsidy for interpolation and spatialization of the stand, normal, faulty and double spacing indicators of soybean plants. The indicator plant stand per meter was considered satisfactory, being slightly below the recommended population. Fatigue and double spacing showed high variability, which reduced the longitudinal distribution of soybean plants at normal spacings, below the target of 75% expected for mechanical fertilizer sowers. Geostatistics shows high spatial dependence of the indicators, however, it evidences predominance of high classes of percentage of normal and faulty spacings, in practically the whole area. The results point to the need for greater monitoring of the operation to identify possible causes, aiming at the correct control with periodic maintenance and maintenance.