Effect of planting pattern on grain yield of late maturity hybrid corn (ksc 704) in kermanshah province

A study was conducted in Mahidasht Research Station to determine the effect of plant density on yield of late maturity hybrid corn (KSC 704), in 1997and 1998.Row spacing examined was 75 centimeter in four plant spacing in row (21, 19, 16.5 and 14.5 cm), and 60 centimeter in four plant spacing in row (25.5,23.5,20.5 and 18 cm) ranged from 63,000 to 93,000 plants per hectares. Experiments were carried out on randomized complete block design with eight treatments (plant density or planting pattern) in four replications including control treatment. The collected data were analysed statistically based on combined variance analysis on yield components and yield for two years. Effect of year was not significant for most of agronomic characteristics and showing that conditions of two years were the same. Effect of treatments for grain yield was significant at 5% level. According to the results, the highest grain yield of 9680 and 9960 kgha-1 were obtained from 75 cm row spacing in 19 cm plant spacing in row and 60 cm row spacing in 23.5 cm plant spacing in row, respectively. Grain yield of 60 cm row spacing and 75 row spacing were 9337 and 8883 kgha-1 respectively.