Pedosphere 5(3): 203--214, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Use of cation exchange membrane in soil potassium release and wheat response to potassium
LI Gui-Bao1, J. J. SCHOENAU2, K. J. GREER2 and P. Y. QIAN2
1 Soil and Fertilizer Institute , Henan Academy of Agricultural Sciences. Zhengzhou, Henan 450O02 (China)
2 Soil Sciences Depariment, Uniuersity of Saskatchewan, Saskatoon, SK. S7N0W0 (Canada)
ABSTRACT
      A pot experiment was conducted in the growth chamber on Saskatchewan soils with different texture to determine the K release status and wheat K demand. The relationship between K uptake and soil available K extracted by cation exchange membrane (CEM-K) and the effect of K fertilizer on wheat growth and soil available K was also evaluated. Treatments of 0, 60 and 120 mg K/kg were applied to sandy, low and high K loamy and clay soils. The highest yields were achieved with the application of 120 mg K/kg in sandy soil and 60 mg K/kg in other soils. On the whole, the clay soil contributed K more than other soils from slowly available fraction. Regression revealed a linear relationship between the soil available K extracted by NH4OAc(Ka) and CEM-K in suspensions (r=0.93). Results also showed that CEM-K in burial and in suspensions were different not only in the amount but also in correlation with Ka or K uptake.
Key Words:  cation exchange membrane, potassium, wheat
Citation: Li, G. B., Schoenau, J. J., Greer, K. J. and Qian, P. Y. 1995. Use of cation exchange membrane in soil potassium release and wheat response to potassium. Pedosphere. 5(3): 203-214.
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