Communications in Plant Sciences, vol 8, p. 69-74, 2018 (2018010) – EARLY VIEW
Author: Ana Kelly Chornobay, Luiz Antonio Odenath Penha, and Renato Yagi
Abstract: In soybean production in Brazil, the ends often justify the means. The high marketing prices of grains have motivated producers to adopt new techniques for cultivation of the legume in an empirical way or without adequate scientific support. Thus, we hypothesized that soybean cross-sowing in equal populations or twice (as used in conventional sowing in parallel rows) may increase soybean yield and decrease weed infestation in crops. In this study, we aimed to evaluate the spatial arrangements of plants associated with the presence or absence of chemical treatment for weed control in the soybean crop. A randomized block design was used with five treatments (four replicates per treatment): 1) uncrossed with the recommended plant population; 2) crossed with the recommended plant population; 3) crossed with double the plant population; 4) crossed with the same plant population and without herbicide; and 5) crossed with double the plant population and without herbicide. Soybeans cross-sowed with the recommended plant population had the same growth as uncrossed soybeans in terms of height and dry matter of shoot and roots, but had a higher leaf area index. Moreover, root nodulation increased in number with soybeans cross-sowed with the recommended plant population and in mass for soybeans cross-sowed with double the plant population, without differences in indirect measures of chlorophyll. Thus, our findings suggested that cross-sowing with the recommended plant population or double the recommended plant population did not aid in weed control and did not increase the yield of soybean grains.
Soybean cross-sowing with the recommended or double the recommended plant population does not aid in weed control or increase soybean grain yields.
Keywords: Glycine max (L.) Merr., Spatial arrangement, Plasticity. (more…)