Effect of varieties,densities and leaf regulation technology on soybean yield in semi-drought area

To better understand soybean high-yield regulation technology in half-drought area,the effect of three soybean varieties,three plant densities and eight leaf regulation technologies on soybean yield by split-split plot design were carried out in half-drought area.The results indicated that soybean variety and plant density affected soybean yield very significantly.The interaction of density and chemical regulation technology had important effects on soybean yield,although not significantly.Combining promoting-type plant growth regulator with foliar fertilizer could improve soybean yield very significantly.The effects of leaf regulation in different varieties and different densities were different,the regulatory effects on soybean yield by leaf regulation technology was significant in Kennong 4 with unconventional plant density(low-density or high-density).