白藤苗期矿质营养的研究*

A Study on Mineral Nutrition for Solution Culture of the Seedlings of Calamus tetradact ylus

This paper deals with the choice of nutrient solutions for the solution culture of the seedlings of Calamus tetradactylus, the best ratio of N P K in nutrient solution for the growth of the seedlings, the symptoms of nutrition deficiency and the effects of nutrition deficiency on the growth of the seedling. The results showed that 1/2 Machlis nutrient solution at pH 5.0 was quite suitable for the solution culture of the seedling; the ratio of 90×10^-6(ppm) N:40×10^-6(ppm)P:160×10^-6(ppm)K was the best;the symptoms of nutrition deficiency appeared on the seedling very slowly, but after 6 months of solution culture some symptoms could be seen. During the solution culture, nutrition deficiency affected the growth of the above-ground more seriously than that of under-ground,therefore the rate of fresh weight of the above-ground to under-ground decreased.