怀牛膝氮磷钾吸收、分配及积累特点的初步研究

Primary study on absorption,translocation and accumulation of N,P and K of Achyranthes bidentata

目的:研究怀牛膝氮、磷、钾吸收、分配和积累特点。方法:采用过氧化氢-硫酸消化法、钒钼黄比色法、火焰光度法测其氮、磷、钾的含量。结果:植株中氮、磷、钾的含量随生育期的推移而下降,其含量顺序为钾>氮>磷;植株对氮、磷、钾的吸收速率呈双峰曲线变化,吸收的最大速率期均处于10月中旬;每生产100 kg怀牛膝根需要氮、磷、钾分别为8.59,1.36,7.40 kg。结论:在9中旬和10中旬是养分吸收的关键时期,应保证养分的充足供应,注重氮肥和钾肥。

Objective： To study the absorption, translocation and accumulation of N, P and K on Achyranthes bidentata . Method： The contents of N, P and K were determined by mean of sulfuric acid-hydrogen peroxide assimilating method, vanadium-am- monium molybdate colorimetric method and flame photometric method, respectively. Result： The contents of N, P and K in the plant were decreasing during the growth period. The absorption rates of the three nutrients by A. Bidentata showed double-peak curves in the whole growth period, maximum absorption rate appeared in the middle ten days of October. About 8.59 kg of N, 1.36 kg of P and 7.40 kg of K were needed to produce each 100 kg root. Conclusion： The key nutrients absorption period is in the first ten days of September and in the middle ten days of October.