Abstract
In 2015–2017, in the proving grounds of the Institute of Agroecology and Plant Production of Wrocław University of Environmental and Life Sciences, field studies were carried out on the different row spacing and sowing amount on the development and yielding of soybean. The test included the assessment of the impact of the varied spacing of rows (15 cm, 30 cm) and the number of sown seeds (50, 75, 90) per unit area. In both of test, the “split-plot” method was used, four repetitions, with two variable factors. The length of the growing seasons of soybean was influenced by the variable thermal and humidity conditions in individual years of the research. In the studies, the factor of differentiated row spacing (15 cm, 30 cm) significantly determined: the number of pods, the number and mass of seeds per plant, the mass of 1000 seeds. The increasing number of sown soybean seeds from 50 to 90 pieces per 1 m2 resulted in a significant increase in the height of the first pod placement, while causing a gradual decrease in the number of 1st order branches, the number of pods per plant, the number and weight of seeds per plant and the weight of 1000 seeds.
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