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The success of soybean-maize double summer crop is very dependent on the sowing date and relative maturity group of cultivars. This study aimed to evaluate the economic feasibility of the adoption of soybean-maize double cropping under different sowing periods and soybean maturity groups. The production data used were obtained from two summer growing seasons (2016/17 and 2017/18) in an experiment carried out at Dois Vizinhos-PR, Brazil. The economic feasibility of each treatment was evaluated through the indicators of gross revenue, gross margin, operating profit, and profitability index. Soybean-maize succession is viable and presents positive profitability. Soybean establishment on October 15th makes it economically unfeasible to sow maize (outside the zoning) as a 2nd summer crop. Soybean maturity groups from 5.1 to 5.3, when sown on October 1st allow profitability and better financial balance, being this combination the most suitable for a double summer crop. Soybean genotypes with maturity group 6.0 are an option for sowing in the middle of September, being the most lucrative and efficient arrangement, providing maize sowing in the middle of February, within the agroclimatic zoning of the region.

Sowing date and maturity groups on the economic feasibility of soybean-maize double summer crop system