Yield components of soybean cultivars under sowing densities

ABSTRACT The aim of this study was to assess yield components and grain yield of soybean cultivars in response to sowing densities. For this, two soybean cultivars and five sowing densities were tested, in a two-factor scheme. The following yield components were measured by the end of the cycle: plant height; insertion height of the first pod; number of nodes per plant; number of pods with one, two, three and four grains; number of pods per plant; number of grains per plant; weight of a thousand grains; humidity and grain yield. Sowing densities did not cause significant variations of grain yield (bags ha-1) for any cultivar, however, higher populational densities promoted a reduction in the number of pods with two and three grains, as well as a reduction in the total number of pods and grains per plant for both cultivars. Cultivar NS 5700 IPRO was the most productive, with a higher number of pods with two and three grains and number of pods and grains per plant.

摘要 本研究旨在探究不同播种密度下大豆品种的产量构成因子与籽粒产量表现。为此，本试验采用双因子设计，共设置2个大豆品种与5个播种密度梯度开展处理。于生育期末对以下产量构成因子进行测定：株高、第一荚着生高度、单株节数、含1粒、2粒、3粒及4粒籽粒的荚果数、单株荚数、单株粒数、千粒重、籽粒含水率与籽粒产量。结果显示，播种密度对任一供试品种的籽粒产量（单位：袋/公顷）均无显著影响；但较高的群体密度会导致两个供试品种的含2粒、3粒籽粒的荚果数减少，同时单株总荚数与单株总粒数均出现下降。供试品种NS 5700 IPRO的籽粒产量最高，其含2粒、3粒籽粒的荚果数、单株荚数与单株粒数均表现更优。