番木瓜典型缺硼症的相关营养元素分析

针对玉溪市元江县番木瓜生产上发生的严重的番木瓜典型缺硼症,以根际土壤及植株各部位器官等为探索对象,采用对比分析法探讨了番木瓜典型缺硼症的相关营养元素含量状况。结果表明,番木瓜发生缺硼症后,不但外部表现典型症状,而且内部相关营养元素也发生了明显的变化。除根部含B量、果实和中上部茎的含K量、果实和下部无叶茎的Ca、Mg含量,缺硼株与正常株的差异不明显外;顶端心叶、中上部的叶和叶柄、中上部茎、下部无叶茎及果实等部位的含B量,番木瓜缺硼株均明显低于正常株;顶端心叶、中上部的叶和叶柄、下部无叶茎及根等部位的含K量,番木瓜缺硼株也明显低于正常株。而顶端心叶、中上部的叶和叶柄、中上部茎及根等部位的Ca、Mg含量,则番木瓜缺硼株明显高于正常株。从Ca、Mg与B的协调性来分析,番木瓜各个部位的Ca/B及Mg/B的比值,缺硼株均明显的高于正常株。说明番木瓜缺硼症的发生,除与土壤有效B缺乏有关外,Ca/B及Mg/B比值过高也是导致该症发生的一个重要原因。

The related nutrients analyses for boron deficient papaya plant

Abstract:The related nutrients analyses for the boron deficient papaya plants grown in Yuanjiang County, Yuxi City were conducted based on the sample comparisons. The results showed that not only did classical symptom appear phenotypically and but also the related nutrients changed when papaya plant lacked in boron. Except for no significant differences between the deficient and normal plants for B content in roots and K in fruits and upper leaves, Ca and Mg in fruits and lower stems, the B and K contents in B-deficient plants were lower the normal ones for top and upper leaves, petiole, stem and fruits, even for K in roots, reversely Ca and Mg contents were higher in B-deficient plants than B-normal ones. Ca/B and Mg/B ratios were higher in B-deficient plants than in normal ones, indicating that B-deficient symptom was related to B deficiency in soil and the higher Ca/B and Mg/B ratios.