Pedosphere 10(4): 363--372, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Genotypic variations in potassium absorption and utilization by Amaranthus spp. |
| TU Shu-Xin, SUN Jing-He, GUO Zhi-Fen, HUANG Min-Gi and ZHANG Pin-Gi |
| Atomic Energy Application Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064 China, Nuclear Agronomy Institute, Zhejiang University, Hangzhou 310O29 (China) |
| ABSTRACT |
| The kinetics of K+ absorption and the utilization of both applied K and K in a calcareous alluvisol with low available K by different genotypes of grain amaranth (Amaranthus spp.), an ancient pseudo-cereal that produces a large biomass and a rich source of healthy nutrients and mineral elements, were studied by means of ion depletion technique and pot experiments. Grain amaranth had a high affinity for K+ uptake in comparison with corn and cotton. However, there were differences among Amaranthus spp. in K absorption and utilization. Some cultivars such as R104, CX-4, Du001, Hy015 and Hr029 which had a higher rate of K absorption and stronger affinity for K+ were typical varieties with high K-use efficiency (KUE). The results showed that high KUE cultivars grew quickly, possessed stronger ability to take up soil slowly available K and mineral K, and did not respond to K fertilization in the soil with low available K. Correspondingly, grain amaranth cultivars CX-77, Cr024, Vd001, Re003 and Sn003 were relatively low in KUE. Compared with high KUE cultivars, they took up more soil available K and both of their dry matter accumulation and K uptake responded to K applied significantly. |
| Key Words: grain amaranth, kinetics, potassium absorption and utilization |
| Citation: Tu, S. X., Sun, J. H., Guo, Z. F., Huang, M. G. and Zhang, P. G. 2000. Genotypic variations in potassium absorption and utilization by Amaranthus spp.. Pedosphere. 10(4): 363-372. |
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