The effect of different row spacing and sowing amount on the development and yielding of soybean (Glycine max (L.) Merrill). Part III. Economic aspects of seed production

Abstract

In Poland, the production of soybean seeds fluctuates significantly from year to year due to the instability of yields and variable profitability of cultivation. The aim of the research was to determine the profitability of soybean (Glycine max (L.) Merrill) production under the influence of different row spacing and the increasing number of sown seeds per 1 m². The cost-effectiveness analysis was carried out on the basis of research results from a field experiment carried out in 2015–2017 on the experimental fields of the Institute of Agroecology and Plant Production of the University of Environmental and Life Sciences in Wrocław. Field studies were carried out on the different row spacing (15 cm, 30 cm) and sowing amount (50, 70, 90 pcs.) on the 1 m². Own research showed that the direct costs incurred for the cultivation of soybean for seeds were shaped by the varied number of sown seeds per 1 m², but did not depend on the row spacing used. The largest share in the structure of direct costs was the total cost of tillage operations and the cost of seed purchase, which depended on the variable number of sown seeds per area unit.