基肥减氮增钾对烤烟光合特性及产质量的影响

为了探讨楚雄烟区基肥减氮增钾对烤烟光合特性和产质量的影响,以K326为材料,设置基肥不同氮钾运筹处理开展了大田试验。结果表明,不同程度减氮增钾均能明显影响烤烟生长发育、光合特性和产质量,其中处理N2K3(N减量20%+K增量40%)烤烟生长发育较快,农艺性状优良,净光合速率显著高于其他施肥水平,叶片SPAD值最大,各项经济指标均表现最高,产量2 737.5 kg/hm~2、产值83 020.5元/hm~2,化学成分协调。综上,推荐楚雄烟区生产K326基肥氮钾最佳施用量为氮72 kg/hm~2、钾151.2 kg/hm~2。

Effects of Reducing Nitrogen and Increasing Potassium in Basal Fertilizer on Photosynthesis Characteristics,Yield and Quality of Flue-cured Tobacco

Aiming to investigate the effects of reducing nitrogen and increasing potassium in basal fertilizer on the photosynthetic characteristics,yield and quality of flue-cured tobacco in Chuxiong tobacco area,field experiment including different nitrogen and potassium treatment were conducted by using K326 as experimental material.The results showed that different levels of reducing nitrogen and increasing potassium obviously affected the growth and development,photosynthetic characteristics,yield and quality of the flue-cured tobacco.The growth and development of the treatment N2K3 (N reduction of 20％+K increment 40％) were faster,agronomic characters were good,net photosynthetic rate was significantly higher than other levels of fertilization,the highest SPAD value,the yield and quality was the highest,the chemical composition was coordinated,production reached 2 737.5 kg/hm2,output value reached 83 020.5 yuan/hm2.Recommended the best fertilizer of production K326 is nitrogen 72 kg/hm2,potassium 151.2 kg/hm2.