Effects of planting date and cultivar on the yield and yield components of soybean in north of Iran

摘要

In order to study the effect planting date and cultivar on yield and yield components of soybean, an experiment was conducted for two seasons (2009-2010) at kateshal research station, Lahijan, northern Iran. Three cultivars, Hill, Sahar and Zan were sown on four sowing dates of Apr 20, Apr 30, May 10 and May 20 during the two consecutive crop seasons. The design was a split-plot replicated three times with sowing date as main plots and cultivar as sub-plots. Data were collected on number of pods per plant, seeds number of main stem pods, pod length, maturity period duration, oil percent, protein percent, 1000- seed weight and seed yield. Mean comparison had been done by Duncan’s test that showed there were significant differences among means of traits at different planting date treatments. Also, there were significant differences among interaction of date of planting and cultivars for all traits at 1% level. The data were analyzed statistically, which showed that the cultivars with early sowing produced gave higher yield and quality as compared to the late sowing date. The results revealed that higher numbers of pods per plant and seeds number of main stem pods were produced by April 30 and Sahar cultivar. Similarly maximum seed yield (4176.09kg ha-1 and 3219.96 kg ha-1) were produced by Apr 20, Sahar and Apr 30, Sahar, respectively.