در استان كرمانشاه )ksc746( اثر آرايش كاشت بر عمكلرد دانه هيپريد متوسط رس ذرت

Effects of planting pattern on the grain yield of medium maturity hybrid corn (KSC 647) in Kermanshah province

In order to determine the hest row spacing and plant to plant in row on the grain yield of medium maturity hybrid corn (KS(ʹ 647) in Mahidasht Research Station in Kermanshah province, a field experiment was carried out for two years (1999-2000) in Randomized Complete Block Design with 8 treatments In this investigation two row spaces (60 and 75 centimeters) and four plant to plant distances were used. Plant densities ranged from 70,000 to 104,000 plants per hectares. Combined variance analysis showed that the grain yield for 60 cm in row spacing with 8733 kg/ha was higher (9%) than 70 cm in row spacing with 8007 kg/ha respectively. The highest grain yield was obtained from 75cm row spacing with 17cm plant to plant in row and 60cm row spacing with 23.5cm plant to plant in row with 9090 and 9120 kg/ha respectively. Simple correlation coefficient of plant height, kernel deep, weight of thousand seed, number of seed row per ear, number of seed in row and yield in relation to number of plant in unite surface area was equal to -0.393, -0.680***, -0.558***, -0.500, - 0.673*** and -0.373 respectively. The majority parameters to yield and yield component showed negative correlation with increasing of plant number in unite surface area. So, grain yield in unite surface area is reduced and it may he related to yield component decreasing in cornfield with 77000 plant per hectare in temperate region. Backward regression analysis was also done for plant density (dependent variable) and other characters as independent. Finally, the correlation between five remaining characters in the model was divided into direct and indirect effects by path analysis. The results derived from correlation and path analysis indicated that cob percent and kernel deep direct effects 1.083* and --0.967* were greatest factors affecting plant density respectively.