Rendimento de sementes produzidas na sucessão soja – milho safrinha na região noroeste do Paraná

Abstract

An work was carried out in the cropping season of 2001/02 with the purpose of evaluate the seed yield under the crop sucession of soybean and corn cultivated during the autumn-winter period, as well as to compare the seed production of early sowed soybean and late sowed corn with the sowing in the conventional dates for both cultures, in Maringa, State of Parana, Brazil. In this regard, an assay was conducted with three precocious soybean cultivars (BRS 183, CD 207 e M-SOY 6101) and three hybrids of corn (CD 304, OC 705 e CD 3121), in complete randomized blocks design, with four replications. Each assay was sowed at different dates. The early sowing date of soybean was in 10/20 and the delayed sowing date of corn was immediately after the harvest of the three soybean cultivars. The early and delayed sowing dates of the two cultures were compared with sowing at 10/15 and 11/15 for corn and soybean, respectively. The evaluated characteristics were seed yeld in kg ha, seed moisture content (wet basis) and a thousand seeds weight of soybean and corn. The obtained results allowed concluding that the early sowing date of soybean did not affect seed yield and thousand seeds weight of the three precocious soybean cultivars. The autumn-winter sowing date of corn reduced the yield of the three evaluated hybrids in comparison with the summer sowing date. A thousand seeds weight characteristic of the corn hybrids had significant reduction in the autumn-winter sowing date. Differences among corn hybrids to the seed yield potential were observed due to the delayed sowing date, however, the same behavior was not observed between the soybean cultivars. The autumn-winter sowing date of corn was not an adequate option of crop management considering the great reduction of seed yield in this period.