水分调控对烟叶钾及钙、镁含量的影响

在褐土和棕壤上进行了盆栽试验,研究土壤含水率与烟叶钾以及钙、镁含量之间的关系。结果表明:在两种土壤上种植的烟株生长中期适度干旱、后期充分灌水均可以提高烟叶的钾、钙含量,提高褐土上种植的烟叶镁含量。两种土壤含水率低的处理烟叶钙、镁含量较高,其原因可能与土壤溶液中阳离子之间的交换以及对根吸收位点的竞争有关。烟叶中钾的含量与钙、镁的含量之间总体负相关,钙和镁之间呈正相关。回归分析表明,移栽后30~60d、61~90d的土壤含水率(W1、W2)、烟叶钙和镁含量这4个因子对两种土壤上种植的烟叶钾含量的影响程度不同,在褐土上Mg>Ca>W2,棕壤土上Ca>W1。

Effects of Water Manipulation on K, Ca and Mg Contents in Tobacco Leaves

The relationship between soil moisture content and the contents of K,Ca and Mg in tobacco leaves was experimented with cinnamon soil and brown soil in pots.The results showed that the contents of K and Ca in tobacco leaves grown in the two soils and Mg content in leaves grown in cinnamon soil(increased) while the tobacco was under moderate stress of water at middle stage and enough irrigated at later stage.Ca and Mg contents were higher in tobacco leaves in soil with low moisture content,it might be(related) with the exchange between mineral cations in soil solution and the competition for the absorptive points of roots. The content of K was negatively correlated to Ca and Mg contents by and large,Ca(content) was positively correlated to Mg content.Regression analysis indicated that the four factors: Mg and Ca contents in tobacco leaves,soil's moisture contents in 30-60 and 61-90 days after transplant(W1 and W2),affected K content in tobacco leaves differently in degree,Mg>Ca>W2 in cinnamon soil and Ca>W1 in brown soil.