Studies On Effects Of Carbohydrate By Nitrogen To Potassium Ratio For Flue-curetobacco

Experiments were conducted on tobacco variety Yunyan85 to study effects of nitrogen to potassium ratio fertilizing on carbohydrates, chemical components and economic properties. The purpose was to discuss the influence of flue-cued leaves' quality and discover a rational combination which could enhance the quality and output.1. The effect of intrinsic chemical content. The result of different fertilizers dosage treatment indicated that it obviously advantageous to accumulating nicotine of every part tobacco's leaf in every growing stage when increasing nitrogen dosage and enhance the ratio of nitrogen to potassium. It was significant influence of accumulating the nicotine content by different ratio of nitrogen to potassium and basic & supplement fertilizers, the relation of nitrogen dosage and nicotine accumulation was positive, the potassium was not obvious to the nicotine accumulate , nicotine was suitable when nitrogen dosage was 8kg/667m~2,ratio of nitrogen to potassium was 1:2 and ratio of basic to supplement was 1:1.5.The relation of potassium dosage and potassium content of flue-cured leaves was positive which potassium dosage from 24 kg/667m~2 to 32 kg/667 m~2,ratio of nitrogen to potassium was from 1:2 to 1:3 and ratio of basic to supplement was 1:1.In the other treatment, the influence of potassium dosage and potassium content of flue-cured leaves isn't significant; total sugar content in flue-cured leaves was C3F>X2F>B2F, The relation of nitrogen dosage and total sugar, reducing sugar, starch in flue-cured leaves in positive. Starch of flue-cured leaves all lower than 3%,carbohydrate was rational when the nitrogen dosage was 8 kg/667m~2, ratio of nitrogen to potassium is 1:4 and ratio of basic to supplement was 1:1.2. the influence of economic properties. In the treatment of nitrogen dosage was 7kg/667 m~2,the output was lower, in this level, its output value, the average price and the high-quality ratio are the medium levels; The economic properties is better that nitrogen dosage was 8kg/667m~2 and potassium dosage was 32kg/667m~2. The treatment of nitrogen dosage was 9kg/667m~2,which output, output value, average price and high-quality ratio was worse than 8kg/667m~2.Synthesizes each processing intrinsic chemical composition and the economical character considered, The combination was best that nitrogenous dosage was 8 kg/667m~2, ratio of nitrogen to potassium was 1:4 and ratio of basic to supplement was 1:1.