菠菜不同器官硝态氮与钾素的含量及关系

在采自不同地区的 8种土壤上进行盆栽试验 ,研究菠菜不同器官硝态氮与钾素的含量及关系。结果表明 ,菠菜体内的硝态氮和钾素含量因器官而异 ,且两者在不同器官的分布表现出相反的趋势 ,即叶片的钾素含量最高 ,根次之 ,叶柄最低 ;硝态氮含量的分布以叶柄最高 ,根次之 ,叶片最低。在每千克土施氮 0 .15和 0 .30 g时 ,菠菜各器官硝态氮和钾素含量的相关系数分别为 - 0 .398和 - 0 .493,说明钾素含量高的器官 ,硝态氮还原转化速度较快。

Contents of nitrate-N and K in different organs of spinach and its relationship

Pot experiments were carried out on 8 different soils sampled from different sites using spinach as indicating crop,to study the contents of nitrate N and K in different organs of spinach and its relationship.The obtained results showed that both the contents of nitrate N and K were different with organs,and their distribution among different organs showed an opposite tendency.The K contents of blades were the highest,then of the roots,and those of stems were the lowest,but the nitrate N contents of blades were the lowest,then of the roots,and those of stems were the highest.Correlation analysis indicated that the coefficient ( r ) was -0.398 and -0.493 at 0.15,0.30 g/kg soil respectively.This kind of tendency between K and nitrate N in different organs indicated that higher potassium content could promote the transformation and reduction of nitrate.