Evaluation of different seed rates effects on yield components, seed and oil yields in soybean varieties conditions in Mazandaran province

Abstract

In order to evaluation of different seed rates on yield components, seed and oil yields of soybean varieties, an experiment was laid out in split-plot based on randomized complete block design with four replications at Dashtenaz region of Mazandaran province in 2013. Main plot was seed rates including 55, 70 and 85 kg.ha -1 and sub sub plots were six soybean cultivars including Sari (JK), Telar (BP), Caspian (033), Nekador(032), Katul(DPX) and Sehar(Pershing). Results showed that seed rates had significant effects on all the traits except seeds per pod. The varieties were different for all the traits. Non-significant interaction effects of seed rates and cultivars for most of the traits indicating that variations of the traits of each cultivar had similar trend in different seed rates. The varieties including Sari and Nekador with high mean values of seed number had high mean values of seed yield. Average seed yield of the genotypes for 55, 70 and 85 kg.ha -1 were 2999, 3246 and 2700 kg.ha -1 , respectively. Among the genotypes, the cultivar of Nekador performs a better the highest seed yield due to its seed yield components. The seed yield amount of this value in three seed levels in 55, 70, and 85 kg/ha are respectively 3766, 3643, and 3496 kg/ha which its value was in the same class for 55 and 70 kg/ha seed rates. Seed rates had not significant effects on days to maturity. Sahar and Katul with 135.3 and 156.9 days to maturity, respectively which were considered as early and late maturity genotypes. Significant positive correlation of seed yield with the characteristics including pods per plant and 1000-seed weight, indicating the important role of these two yield components for seed yield increasing.