钾肥种类与用量对烤烟产量品质的影响

用四川典型的植烟土壤研究了钾肥种类与用量对烤烟产量和品质的影响。结果表明，在速效钾水平较低的中性紫色土上，施钾效果明显，最佳施量为Ｋ２Ｏ１８０ｋｇ／ｈｍ＾２，养分与比为Ｎ：Ｐ２Ｏ５：Ｋ２Ｏ＝１：１：１．５。而在速效钾水平较高的钙质紫色土上，烤烟的最佳施钾量为Ｋ２Ｏ１２０ｋｇ／ｈｍ＾２，养分配比为Ｎ：Ｐ２Ｏ５：Ｋ２Ｏ＝１：１：１，并可以氯化钾部分代替硫酸钾为烤烟提供钾素，当烟叶钾氯比等于４时，氯化钾

EFFECTS OF DIFFERENT AMOUNTS AND TYPE OF POTASSIUM FERTILIZERS ON YIELD AND QUALITYOF FLUE-CURED TOBACCO

Experiments were conducted to study the effects of different amounts of K2SO4and KCl on the yield and quality of flue-cured tobacco.The results indicated that in theneutral purple soil,while the potassium content is low,the effect of applying K2O on flue-cured tobacco was significant.The best amount of K2O was l80 kg/hm2 and the optimumcombination was expressed as N:p2O5:K2O=1:1:1.5.In the calcareous purple soil,while the potassium content is high,the effect of applying K2O on flue-cured tobacco wasvery little,The better amount of K2O was l20 kg/hm2 and the optimum combination wasexpressed as N:P2O5:K2O=1:1:l.Then KCl could partly replace K2SO4,the yieldand output value of tobacco leaf would be increased When the ratio of Cl and K2O was 4,the best percentage of KCl replaced for K2O was 56.5%in the neutral purple soil and 96.88%in the calcareous soil.