秸秆覆盖条件下钾肥用量对土壤钾含量和烟叶钾含量的影响

通过盆栽试验研究了秸秆覆盖条件下秸秆向土壤释放钾的情况,以及施用不同用量钾肥对土壤速效钾、缓效钾含量以及烟叶钾含量的影响。结果表明,在烤烟生长阶段,秸秆持续向土壤中释放钾,呈前期、后期慢,中期快的特点。土壤速效钾和缓效钾含量随施钾量的增加而增加,随烤烟的生长而逐渐减少。随着施钾量的增加,烟叶中钾含量上升。秸秆覆盖可以提高土壤速效钾和缓效钾的含量,有助于提高烤烟青烟叶的钾含量。

Effects of Different Application Measures of Potassium Fertilizer on Potassium Contents in Flue-cured Tobacco Leaves and Soil under Straw Mulching Conditions

Basin experiments were conducted to study the effects of different application measures of potassium fertilizer on potassium contents in flue-cured tobacco leaves and readily available potassium content & slowly available potassium content of soil in straw mulching conditions.The results showed that potassium of straw had a sustained release to soil and release speed hadslow-fast-slow characteristics in the flue-cured tobacco growth stages.Available potassium content and slowly available potassium content of soil increased with potassium fertilizer application,but they had a decrease with growing of flue-cured tobacco.Application of straw mulching could improve available potassium content and slowly available potassium content of soil.With increasing ofpotassium fertilizer application,potassium content of green leaves also increased,application of straw mulching was conducive to increasing of potassium content of green leaves.