Study of seed yield and some agronomic characters in sole and intercropping of two soybean cultivars under khoy conditions

Intercropping of two cultivars of soybean, especially those of different growth types, may cause increase in production, mainly due to better use of required sources for growth. In a field experiment, seed yield of two soy bean cultivars which differed in some morphological characteristics were investigated at Khoy Agricultural Research Station. A split plot design with 3 replications was used. Main plots were consisted of 3 plant densities of 20, 33 and 50 plants m-2, sub-plots were allocated to 5 intercropping ratios of Williams and Clark cultivars. The results indicated that plant height, number of sub branches and first pods height were affected by plant density and intercropping ratio of 2 cultivars. Pod number per plant and 1000 seed weight were the most important yield components and showed a positive correlation with plant density and intercropping ratios, but number of seeds per plant was not affected. The highest seed yield (4615 kgha-l) was obtained from 50:50 ratio of two cultivars in 50 plants m-2 density which had a land equivalent ratio (LER) above 1.10.