茶树的钙镁营养及土壤调控

通过多年的大量分析结果表明，正常生长的茶树各器官中的钙、镁保持有一定的含量和比例，钙随组织老化而积累，而镁总是趋向新生的幼嫩组织，Ｃａ／Ｍｇ值则随组织老化而急速增大。叶中的Ｃａ／Ｍｇ值＞ｌ，根中的Ｃａ／Ｍｇ值＜１。茶叶品级随Ｃａ／Ｍｇ值升高而降低。茶树对土壤钙、镁的吸收，不仅取决于土壤活性钙、镁的绝对含量，同时也取决于钙镁的比例平衡。缺钙、缺镁或两者比例失调，对茶树生长和茶叶产量、品质均有一定的影响。文中还对钙、镁的土壤调控进行了讨论。

Calcium and Magnesium Nutritions for Tea P1ants and Their Soil Controls

According to 5 years’plant analyses and soil tests, the contents of Ca and Mg and the Ca/Mg value dif-fered in various organs of the normally growing tea plants. Ca usually accumulated in aged tissues whereas Mg tended to exist in young tissues, The Ca/Mg value got higher rapidly as the tissues got older. The Ca/Mg value was above l in leaves but below l in roots。 The graded quality of made tea dropped with the in-creasing of the Ca/Mg value in fresh leaves. The uptakes of the two elements by tea plants from the eoil de-pended not only on the contents of active Ca and active Mg in the soil solution but also on the balance of the two elements in the soil. Deficiency of either element or imbalance of the two elements would decrease the growth and the quality of tea shoots, resulting in the low yielding of tea production and inferiorquality of made tea. Soil controls of the two nutritions were discussed in this pape。