Variabilidade espacial da produtividade da soja e sua correlação com a qualidade da semeadura

Abstract

Soybean has stood out as the main agricultural product in the last decades, due to its continuous growth in the market. Thus, the proper deployment of the crop is important to achieve good productivity. Therefore, the objective of this work was to evaluate the quality of sowing and its correlation with the spatial variability of soybean yield from management zones. The experiment was conducted on the Santa Ana farm, in the municipality of Dourados-MS. To evaluate the quality of sowing, the distribution of sampling points was performed using a sampling grid of 0.5 ha. The indicators were the stand and the longitudinal distribution of plants, measured by the percentage of normal, poor and double spacing. Soybean yield data were automatically collected by a harvester. Descriptive statistical analysis and geostatistical analysis was performed for the data, aiming to analyze their spatial dependence. Generations of management zones for the sowing quality and yield data were performed, taking into account the fuzzy performance index and the modified partition entropy. Although the stand was uniform, the longitudinal distribution of plants at normal spacing was regular and below the ideal, which would be 90%. Soybean yield was moderately dependent but did not show significant correlation and agreement with the evaluated sowing quality indicators.