Effect of Cotton and Soybean Intercropping on the Production Indicators of the Two Crops

Abstract

The results of the competitive indicators between cotton and soybean showed that the Land Equivalent Ratio (LER) for soybean crop (Lb) was greater than that of cotton (La) in the distance of 10 cm and for all IS’S as well as the planting distances of 15, 20 and 25 cm at the IS of 1 cotton: 2 soybean. While planting at a distance of 15, 20, and 25 cm, when IS (1: 1) and (1: 2) cotton: soybean, LER for cotton (La) was greater than for soybean (Lb). It also gave Crop Performance Ratio (CPR) for cotton higher than soybean when planting at a distance of 15, 20 and 25 cm in all IS’S, as well as when planting at a distance of 10 cm when IS’S were (1: 2) and (2: 2) cotton: soybeans. The values of Relative Crowding Coefficient (RCC) were higher for the soybean than for cotton under IS of 1 cotton: 2 soybean when planting at a distance of 10, 15, 20, and 25 cm, while the Land Equivalent Coefficient (LEC) values gave yield advantage in IS of 2 cotton: 2 soybeans, for all planted distances, and it ranged between, 0.25-0.33. The values of the Competition Ratio (CR) for cotton were higher than one in the IS of 2 cotton: 2 soybean at all planting distances. While the values of (CR) were greater than one for soybean at the IS of 1 cotton: 2 soybean and for all planting distances. The aggressivity (A) for cotton was positive in the IS of 2 cotton: 2 soybean and negative for the IS of 1 cotton: 2 soybean at all planting distances.