钾素营养对防治番木瓜叶枯病的影响

Influence of Potassium on the Resistance of Carica papaya L.to Leaf Blight

对番木瓜叶枯病与植株营养、土壤相关养分的关系等进行研究,结果表明,番木瓜叶枯病是由于土壤有效钾缺乏而导致的一种生理性缺钾症;施用钾肥能有效控制该症的发生并获得较高产量。在发生缺钾叶枯病的番木瓜根、茎、叶片、叶柄等器官中镁含量均明显升高,说明番木瓜植株钾镁间存在拮抗作用。

The experiments of potassium nutrition in papaya （Carica papaya L.） showed that leaf blight was caused by available potassium deficiency in soil where papaya was planted. Application of potassium fertilizer could effectively control such disease and get higher yield. In the roots, stems, leaves and petioles of papaya with leaf blight which was caused by potassium deficiency, the contents of magnesium were obviously increased, indicating the antagonistic effect between the two elements in papaya plants.