Effects of Different Nitrogen,Phosphorus,and Potassium Ratios on the Yield and Quality of Yunyan 99 in Luonan Tobacco Region
[Objective]To study the effects of different nitrogen,phosphorus,and potassium ratios on the agronomic traits,yield and quality of Yunyan 99 in the Shangluo tobacco growing area of Shaanxi.The reserch would clarify the optimal economic fertilization amount for Yunyan 99 in the Shangluo tobacco planting area and provide theoretical and technical support for its production.[Method]Nine treatments were set ac-cording to L9(34)for orthogonal test,including nitrogen application rates(97.2,108.0 and 118.8 kg/hm2),phosphorus application rates(83.7,93.0 and 102.3 kg/hm2),and potassium application rates(179.55,199.50 and 219.45 kg/hm2).[Result]The results showed that when the nitrogen application rate was 118.8 kg/hm2,the dry matter accumulation of tobacco plants was the highest,and the total amount of a-roma substances in cured tobacco(B3F and C2F grades)was the highest,what's more,the yield,output value and the proportion of first-class tobacco were the highest.When the phosphorus application rate was 93.0 kg/hm2,the chemical composition score of C3F grade tobacco was the highest,the total amount of aroma substances in B2F grade tobacco was the highest,and the yield,output value were the highest.When the potassium application rate was 199.50 kg/hm2,the chemical composition score and total aroma matter of C3F grade cured tobacco leaves were higher,while total aroma matter of B2F grade tobacco leaves were the highest,yield,output value and the proportion of top grade tobacco leaves were the highest.[Conclusion]When the nitrogen application rate was 118.8 kg/hm2,phosphorus application rate was 93.0 kg/hm2,and po-tassium application rate was 199.50 kg/hm2,the agronomic traits,quality of cured tobacco,yield and quality of Yunyan 99 are better.
万方数据
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