番木瓜植株镁钾含量变化与缺钾叶枯病的关系  

Relationship Between the Mg and K Contents and Potassium-deficient Leaf Blight of Papaya Plant

作　　者：杨绍聪[1] 吕艳玲[1] 段永华[1] 饶敏[1] 张艳军[1] 

机构地区：[1]云南省玉溪市农业科学研究所,玉溪653100

出　　处：《中国农学通报》2005年第9期388-391,451,共5页Chinese Agricultural Science Bulletin

基　　金："玉溪市番木瓜生理性缺钾叶枯病研究"(YN02)的部分内容

摘　　要：采用田间调查、采样及其室内分析与田间试验相结合的方法,在低钾而高镁的土壤上,从植株各个部位探索番木瓜植株镁、钾营养变化对其生理性缺钾叶枯症的影响。结果表明,番木瓜叶枯症的发生,除与土壤有效钾缺乏有关外,Mg/K比值过高也是导致该症发生的一个重要原因。发生缺钾叶枯病的番木瓜植株,其根、茎、叶片、叶柄等器官含镁量均明显提高,施用钾肥后不但提高了植株的含K量,而且能抑制番木瓜植株对镁的吸收,从而协调平衡Mg/K比值,生理性缺钾叶枯症得到有效控制。The effect of Mg and K contents on physiologically potassium-deficient leaf blight of papaya plant was studied by investigation and sampling in the fields with low K and high Mg and chemical analyses in the laboratory. The result indicated that the disease severity was related to high Mg/K ratio except for absolute K deficiency in soil. The root, stem, leaf and petiole had high Mg content when the plant was deficient in K. K application controlled the disease effectively because it inhibited Mg absorption of the plants and balanced Mg/K ratio.

关 键 词：番木瓜 缺钾叶枯病 Mg/K值 叶枯病 缺钾 植株 高镁 含量变化 土壤有效 田间调查 

分 类 号：S667.9[农业科学—果树学] S436.33[农业科学—园艺学]