缓控释钾肥对土壤钾含量及烤烟生长和品质的影响OA

The application of slow-controlled-release potash fertilizer can reduce labor and fertilizer input,but the mechanism of its effects on soil potassium content and the growth and quality of flue-cured tobacco is still not clear.In this study,the microscopic morphology,release properties of slow-controlled-release potash fertilizer and its effects on soil potassium content,dry matter accumulation in tobacco plants and quality of flue-cured tobacco were explored by laboratory and field experiments.The results showed that the initial potassium release efficiency of slow-controlled-release potash fertilizer in soil and water was 1.49%and 10.07%,respectively.The cumulative potassium release efficiency in soil and water at 28 d was 9.69%and 72.55%,respectively.Compared with traditional potassium fertilizers,the equal amount of slow-controlled-release potassium could increase the content of available potassium and slow-release potassium in the soil by 26.42%and 41.99%,respectively,increase the accumulated potassium contents in the tobacco leaves by 18.36%,increase the saccharine ratio of the upper tobacco leaves and the apparent utilization rate of potassium.Correlation analysis results showed that available potassium content in soil was significantly and positively correlated with potassium,total sugar and reducing sugar contents in tobacco leaves.The application of slow-controlled-release potash fertilizer could effectively enhance the soil potassium supply capacity,promote root development and tobacco growth,increase potassium content in the upper leaves,and effectively improve the quality of flue-cured tobacco.