Effects of Soil Moisture Regulation on Growth and Dry Matter Accumulation and Nutrient Absorption of Flue-cured Tobacco

A rain-proof experiment was conducted to study the effects on form and dry matter accumulation and nutrient absorption of flue-cured tobacco by controlling the water at different growth periods.The results indicated that the soil moisture lower limit maintains separately in 60%、80%、70% may guarantee the normal growth of flue-cured tobacco during different growth periods,if the soil water content was lower than 45% in root spreading stage and lower than 65% in vigorous growing stage,the height,the stem surrounds and the leaf area would be influenced remarkably,it would be more advantageous to yield to increase the supply of water in vigorous growing stage;the moisture regulation influenced the dry matter accumulation of the root and the leaf remarkably;the concentration of K was the most,and then the N,the concentration of P was the least in all the moisture content regulations.The content of N,P and K at the root and the stem increased significantly in the maturing stage by moisture regulation,there are not obvious rules in other stages.