Abstract
Soybean [Glycine max (L.) Merr.] yield is responsive to changes in plant population and row spacing. The objective of this study was to compare some agronomic traits of soybean cultivated in two different row spaces in a field in St Pauls, NC. Among the traits, total seed weight showed the highest level of variation than others in both 25 cm (97.31%) and 50cm (60.23%) row space. The lowest co-efficient of variation, 5.06% at 25 cm and 11.54% at 50 cm were found for days to flowering. Mean value showed that plants grown in 25 cm row space have a higher 100-seed and total seed weight than those grown in 50 cm row space. Plants grown in 50 cm row space had a slightly increased mean plant height compared to those grown on 25 cm. Plants grown in 50 cm row space had greater pod and seed numbers compared to those grown on 25 cm. Comparisons of the agronomic parameters between 25 and 50 cm row space employed by two-tailed t test (type 2; α = 0.05) showed that there are significant differences in days to germination, days to flowering, number of seeds, and total seed weight between plants grown in 25 cm vs. 50 cm row space; while plant height and number of pods were not differ significantly. However, further research may reveal a system for soybeans cultivation in the future which would increase the probability of obtaining maximum yields with narrow rows.
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