A model for the yield losses estimation in an early soybean (Glycine max (L.) Merr.) cultivar depending on the cutting height at harvest
Krzysztof Rębilas , Agnieszka Klimek-Kopyra , Magdalena Bacior , Tadeusz Zając
AbstractGrowing interest in soybean (Glycine max (L.) Merr.) cultivation, especially in the temperate climate zone, necessitates the search for high-yielding varieties with an optimal growing period. In Europe, it is recommended to cultivate early (00) and very early (000) varieties, which due to their biology form the first pair of pods very low, just above the ground. This unfortunately generates losses during harvest. The literature lacks information on the sowing density at which pod-setting in early varieties soybean is highest and what losses this entails during cutting. The objective of this work was to create a mathematical model for estimating seed yield losses depending on varying cutting height applied during harvest and the sowing density. To achieve the goal the position of fruiting nodes and productivity of pods depending on sowing density for the early soybean variety was determined. Availability of water during vegetation period was an important factor having impact on the pods position on stem and therefore strongly influenced seed weight losses caused by the cutting process. According to the model estimations the lowest losses were obtained for the years with the sufficient precipitation during vegetation period and in essence they never exceeded the value of 15 g m−2 even for the highest level of cutting (15 cm) applied during harvest. For all sowing densities (20–140 seeds m−2), the increase of cutting height from 5 up to 10 cm caused increase of seed yield losses typically about two- and threefold. However at the cutting height of 15 cm the losses increased even seven- and eight-fold, especially for the very high sowing densities. The highest percentage seed yield losses (11%) were demonstrated at the lowest sowing density (20 seeds m−2). In the case of favourable distribution of rainfall, high sowing density (80–140 seeds m-2) is recommended because it ensures high yield of soybean. Sowing density of 80 seeds m−2 can be recommended as optimal density from an economic point of view because it provides a relatively high seed yield with the lowest percentage losses and smaller seed costs compared to higher densities giving similar yield.
|Journal series||Field Crops Research, ISSN 0378-4290, e-ISSN 1872-6852, (N/A 140 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Harvest losses, Fruiting nodes, Seed yield, Seeds density|
|Publication indicators||= 0; : 2018 = 1.871; : 2018 = 3.868 (2) - 2018=4.683 (5)|
|Finansowanie||This work was supported by funds of Ministry of Science and Higher Education granted for University of Agriculture in Kraków for the year of 2019.|
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