1Assessing Soil Available Potassium by Cation Exchange Membrane and Conventional Chemical ExtractionsEnglish Full Text

LIU ZHAOHUI; J. SCHOENAU; QIAN PEIYUAN and NIE YAN (China Agricultural University, Beijing 100094,China)(Department of Soil Science, University of Saskatchewan, Saskatoon S7N 5A8,Canada)(Center Lab., Shandong Academy of Agricultural Sciences, Jinan 250100

Abstract: Four testing methods using canon exchange membrane （CEM）, ammonium acetate, ASI （0.25 mol L-1 NaHCO3+0.01 mol L-1 EDTA +0.01 mol L-1 NH4P） and 1.0 mol L-1 boiling nitric acid, respectively, were used to evaluate soil available K. The soil K tested by CEM was significantly correlated with that by the other （conventional） methods （r2=0.43**~0.95***）. The soil K tested by CEM saturated with NH4HCO3 （15 min extraction） was most closely correlated with that by the other methods （2 =0. 60***~0.95***）. Potassium availability, as predicted by soil test, was comparable to actual K uptake by canola and wheat grown on the soils in growth chamber. Regression analyses showed that plant K uptake was more closely correlated with K extracted by CEM （r2=0.56***~0.81***） than that by the conventional methods （r2=0.46***^;0.81***）, most closely correlsted with that by NH4HCO3-saturated CEM for 15 min （r2=0.81***）, and worst correlated with that by HNO3 （r2=0.45**~0.72***）.

Keywords：

canon exchange resin membrane; conventional chemical extractions; soil available potassium;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

1Assessing Soil Available Potassium by Cation Exchange Membrane and Conventional Chemical ExtractionsEnglish Full Text

LIU ZHAOHUI; J. SCHOENAU; QIAN PEIYUAN and NIE YAN (China Agricultural University, Beijing 100094,China)(Department of Soil Science, University of Saskatchewan, Saskatoon S7N 5A8,Canada)(Center Lab., Shandong Academy of Agricultural Sciences, Jinan 250100

Read on your phone instantly

Citation Network

Related Literature