Study on the Middle-micro Element Fertilizer of the Fflue-cured Tobacco in the Yellow Mountain Soil

The effect of the middle-micro-element (Mg.B.Mo) fertilizer on the yield, quality, and chemistry composition of the tobacco leaf were studied. The studied. The results that yield could be increased by 4.2% to 5.5%,the ratio of high-grade tobacco leaf could be increased by 2.67 to 3.65 percent points and the output value could be increased 13. 30% to 15. 95% by adding Mg.The ratio of high-grade tobacco leaf could be increased 5.68% by adding Mo. The effect of this kind of fertilizations was somehow discounted by using the mixture fertilizer of Mg and B. The chemical composition of tobacco was influenced in a certain range by using the middle-micro-element fertilizer.The best model of using fertilizer for getting high-grade tobacco leaf was suggested.