打顶时不同追钾对云南烤烟含钾量的影响

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

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K2 SO4、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KH2 PO4、KNO3 和K2 SO4)处理 ,而 3种土壤追施K肥处理以施K2 SO4和KNO3 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 %。

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 K_2SO_4, KNO_3 or slow-released KCl is better than that of foliar-spraying KH_2PO_4, K_2SO_4 or KNO_3 on the improvement K content in leaves, especially in upper leaves. K content in upper leaves increases from 2.6%(CK) to 3.2%(K_2SO_4 or KNO_3).