The effects of plant density formed from different between and within row distances on quantitative and qualitative traits of three Soybean cultivars at Urmia region

In order to investigate the effect of between and within row distance on the quantitative and qualitative traits of three soybean cultivars, a field study was conducted at research field of the Faculty of Agriculture, urmia university. The factorial-split plot design of the study comprised of randomized complete block with three replication. Main plots were including two row spaces(45 and 60 cm) and three within row distance (5, 10 and15 cm) that located in factorial arrangement. Subplots were allocated to three cultivars; WILIAMS, AS3925 and CLARK-63 (maturity group II, III, IV) respectively. Results showed that increasing between and within row spacing about all cultivars caused to decreasing in plant height and height of first pod, but increased the number of nods, number of pods per main stem, branches and per plant, diameter of stem and number of branches per plants. The highest total dry matter, yield and harvest index were obtained from between and within row spacing 45*5 cm. In comparison with other cultivars, AS3925 with 3510.8 kg/ha showed superiority over the two other cultivars. The between and within row distance did not show significant effects on oil and protein content, but there were significant difference among cultivars. Williams and AS3925 cultivars with 36.85 % and 19.36 % respectively showed the highest protein and oil content.