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Use of Cation Exchange Membrane in Soil Potassium Release and Wheat Response to PotassinmEnglish Full Text

LI GUI-BAO; J. J. SCHOENAU; K. J. GREER and P. Y. QIAN( Soil and Fertilizer Institute , Henan Academy of Agricultural Sciences. Zhengzhou, Henan 450O02 ( China)(Soil Sciences Depariment, Uniuersity of Saskatchewan, Saskatoon, SK. S7N0W0 ( Canada)

Abstract: A pot experiment was conducted in the growth chamber on Saskatchewan soils with dfferent texture todeterniine the K release status and wheat K demand. The relationship between K uptake and soil availableK extracted by cation exchange membrane (CEM-K) and the effect of K fertilizer on wheat growth and soilavailable K was also evaluated. Theatments of 0, 60 and 120 mg K/kg were applied to sandy, low and highK loamy and clay soils. The highest yields were achieved with the application of 120 mg K/kg in sandysoil and 60 mg K/kg in other soils. On the whole, the clay soil contributed K more than other soils fromslowly available fraction. Regression revealed a linear relationship between the soil available K extractedby NH4OAc(Ka) and CEM-K in suspensions (r=0.93). Results also showed that CEM-K in burial and insuspensions were different not only in the amount but also in correlation with Ka or K uptake.
  • Series:

    (D) Agriculture

  • Subject:

    Crop

  • Classification Code:

    S512.106

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