Effects of different plant densities obtained in skip row system of earlier and late sown double crop soybean on seed yield and yield components

Optimization of plant density for different environments and planting dates is very important for maximum yield. This study was conducted to determine the differences in seed yield and yield components with respect to various plant densities in skip row system of early and late sown soybean in the double cropping system in Çukurova Region. The research plots were established in the experimental field of the Fields Crops Department, Faculty of Agriculture, University of Cukurova in 2009 and 2010. A split plot design was used with sowing date (15 June, 30 June) as the main plot and plant density as subplot. Arısoy soybean variety was used in this study.It was determined that planting dates had no significant effect on seed yield. Among the plant densities, the highest seed yield was obtained from 30.1 plant/m2 with 4145.0 kg/ha and the lowest was obtained from 50 plant/m2 with 3617.0 kg/ha in 2009. In 2010, seed yield values varied between 3607.3 and 4241.3 kg/ha. When the average seed yield values were considered the highest seed yield values were obtained from 30.1 plant/m2 (4195.7, 4071.7 kg/ha in 2009 and 2010, respectively) and the lowest seed yields were obtained from 50 plant/m2 (3723.0 kg/ha, 3616.8 kg/ha in 2009 and 2010, respectively).