[Primary study on absorption, translocation and accumulation of N, P and K of Achyranthes bidentata].
OBJECTIVE
To study the absorption, translocation and accumulation of N, P and K on Achyranthes bidentata.


METHODS
The contents of N, P and K were determined by mean of sulfuric acid-hydrogen peroxide assimilating method, vanadium-ammonium molybdate colorimetric method and flame photometric method, respectively.


RESULTS
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.


CONCLUSIONS
The key nutrients absorption period is in the first ten days of September and in the middle ten days of October.
Zuo
Xiao-yan
XY
Henan Agricultural University, Zhengzhou 450002, China.
Liu
Hui
H
Xue
Shi-yue
SY
Han
Yan-lai
YL
Zhang
Yan-li
YL
Wang
Lei
L
Zhang
Zhong-yi
ZY
Tan
Jin-fang
JF
D029044:Achyranthes / Q000378:metabolism*; D001692:Biological Transport; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*
D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium