为探明枸溶性钾肥配施在烤烟栽培上的应用效果,通过连续种植2季烤烟的盆栽试验,研究了枸溶性钾肥与硫酸钾配施对烤烟生物量、钾素吸收量、烤烟-土壤系统钾素平衡以及土壤速效钾、缓效钾含量变化的影响.结果表明,枸溶性钾肥配施硫酸钾较单施硫酸钾显著提高2季烤烟生物量和钾素吸收量,以T3处理(75％枸溶性钾肥+25％硫酸钾)效果较好,其中钾素吸收总量比单施硫酸钾增加33.05％;枸溶性钾肥配施硫酸钾处理烤烟生长后期枸溶态钾的分解供应缓解了土壤钾素亏缺,维持土壤钾素平衡,有利于烤烟生长,其中T3处理钾素平衡系数为1.06,优于其他配施比例;2季烤烟收获后,枸溶性钾肥配施硫酸钾处理土壤速效钾和缓效钾含量均高于单施硫酸钾肥处理.因此,枸溶性钾肥配施硫酸钾能更好地补充土壤中的有效钾素,缓解土壤钾素不足,促进烤烟生长,建议烤烟生长连作时配施一定比例的枸溶性钾肥,尤以75％枸溶性钾肥+25％硫酸钾配施比例较好.%In order to define the application effect of combined application of citrate soluble potash on tobacco culture,the effects of combined application of citrate soluble potash and potassium sulfate on biomass,potassium uptake,potassium equilibrium of flue-cured tobacco-soil system and content change of available potassium and slowly available potassium of soil were studied under the successive planting of two seasons flue-cured tobacco.The results showed that compared with the single application of potassium sulfate,combined application of citrate soluble potash and potassium sulfate could significantly increase biomass and potassium uptake of two seasons flue-cured tobacco,among which the treatment T3 (75％ citrate soluble potash + 25％ potassium sulfate) had better effect,the potassium uptake increased by 33.05％ in comparison with the single potassium sulfate treatment;the treatments with citrate soluble potash and potassium sulfate at late grow stage could relieve the deficiency of potassium in soil,keep potassium equilibrium,facilitate the growth of flue-cured tobacco.The equilibrium coefficient of T3 treatment was 1.06,which was better than others proportional applications.After harvest of two seasons fluecured tobacco,the contents of available potassium and slowly available potassium of soil of the treatments with citrate soluble potash and potassium sulfate was higher.Therefore,the combined application of citrate soluble potash and potassium sulfate could supplement the potassium in the soil,relieve the deficiency of potassium effectively,promote the growth of flue-cured tobacco,so suggesting that applying citrate soluble potash in a certain proportion when flue-cured tobacco was cropped continuously,the proportion of 75％citrate soluble potash + 25％ potassium sulfate was better.
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