打顶时不同追钾对云南烤烟含钾量的影响

Effcts of different application measures of potassium fertilizer by topping on potassium contents in flue-cured tobacco plants in Yunnan Province

摘要: 田间试验研究打顶时不同追K对云南烤烟含K 量的影响结果表明，打顶时追施K 肥可提高烤烟叶片含K量和烟株吸K量。烤烟田间土壤补施K肥(包括根部集中施用K₂SO₄、KNO₃和缓效钾)处理其提高烟叶含K量效应明显优于叶面喷施K 肥(包括叶面喷施KH₂PO₄、KNO₃和K₂SO₄)处理，而3种土壤追施K肥处理以施K₂SO₄和KN0₃效果最佳，烤烟生育后期追施K肥提高中、上部叶片含K 量效果最佳，顶叶含K量由对照的2．6％增至3．2％。

Abstract: Field experiments were conducted to study the effects of different application measures of potassium fertilizer by topping on K contents and K absorption in flue-cured tobacco in Yunnan Province．The results indicate that the effect of applying K₂SO₄，KN0₃ or slow-released KCI is better than that of foliar-spraying KH₂PO₄，K₂SO₄ or KN0₃ on the improvement K content in leaves，especially in upper leaves．K content in upper leaves increases from 2．6％ (CK)to 3．2％(K₂SO₄ or KNO₃).