钾、钙、镁交互作用对烤烟生长和养分吸收的影响

Effects of Interaction of Potassium,Calcium and Magnesium on Flue-cured Tobacco Growth and Nutrient Absorption

通过盆栽试验和田间试验,对烤烟植株体内钾、钙、镁的交互作用进行研究.结果表明,施用钾肥、钙肥或镁肥,均能显著提高烟叶的钾、钙、镁含量.钾、钙、镁之间存在交互作用,但并不是单一的拮抗作用.钾对烟株吸收钙、镁养分产生抑制作用;钙对镁的吸收产生抑制作用,而对钾的吸收有促进作用.在本试验的条件下,当烤烟叶片的钾、钙、镁含量比例为1:0.54:0.07时,烤烟产量和上等烟比例较高,分别达到2 958 kg·hm-2和57.97%;K+、Ca2+、Mg2+施用比例在1.0:1.0～2.0:0.1～0.15之间时比较适宜,可作为烤烟钾、钙、镁平衡关系的参考指标.

Trial results showed that application of potassium, calcium and magnesium remarkably increased the content and total uptake of potassium, calcium and magnesium in flue-cured tobacco. The interaction existed in potassium, calcium and magnesium, which was not simply antagonistic. Potassium antagonized calcium and magnesium absorption. Calcium antagonized the absorption of magnesium but promoted the absorption of potassium. The research indicated that yield and the ratio of high quality tobacco were increased remarkably on the condition that the ratio of potassium, calcium and magnesium in plant was 1 ： 0. 54 ： 0. 07, which were 2 958 kg·hm^-2 and 57.97%. It was suggested that optimum application ratio for K^＋, Ca^2＋ and Mg^2＋ was 1.0 ： 1.0-2.0 ： 0.1 -0.15, which was advised as reference index for the balance of potassium, calcium and magnesium in fluecured tobacco.