摘要
Fourtestingmethodsusingcationexchangemembrane(CEM),ammoniumacetate,ASI(0.25molL^-1NaHCO3+0.01molL^-1EDTA+0.01molL^-1NH4F)and1.0molL^-1boilingnitricacid,respectively,wereusedtoevaluatesoilavailableK.ThesoilKtestedbyCEMwassignificantlycorrelatedwiththatbytheother(conventional)methods(r^2=0.43^**-0.95^***).ThesoilKtestedbyCEMsaturatedwithNH4HCO3(15minextraction)wasmostcloselycorrelatedwiththatbytheothermethods(r^2=0.60^**-0.95^***),Potassiumavailability,aspredictedbysoiltest,wascomparabletoactualKuptakebycanolaandwheatgrownonthesoilsingrowthchamber.RegressionanalysesshowedthatplantKuptakewasmorecloselycorrelatedwihtKextractedbyCEM(r^2=0.56^**-0.81^***)thanthatbytheconventionalmethods(r^2=0.46^***-0.81^***),mostcolselycorrelatedwiththatbyNH4HCO3-saturatedCEMfor15min(r^2=0.81^***).andworstcorrelatedwiththatbyHNO3(r^2=0.45^**-0.72^***)
出版日期
1999年01月11日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
