对钾作为橡胶树主要养分的重要性已有充分的评价。在胶树生活周期中,有大量的钾被不断地固定下来,每公顷445株的一年生植株固定的钾为7公斤,每公顷267株33龄的植株固定的钾则增加到1,233公斤。从胶乳移走的钾,其数量取决于胶树的产量及其营养状况。对8个常用无性系的一个试验表明,在第二、三割面正常割胶的条件下,每 The importance of potassium as a major nutrient in rubber trees has been well documented. During the life cycle of the gum tree, a large amount of potassium was continuously immobilized. The annual potash yield of 445 plants per hectare was 7 kg, and that of 267 plants and 33 plants per hectare increased to 1,233 kg. The amount of potassium removed from the latex depends on the yield of the gum tree and its nutritional status. A test of eight commonly used clones showed that under the conditions of normal tapping of the second and third cutting planes,