RELEASE OF NON-EXCHANGEABLE SOIL POTASSIUM BY RESIN-EQUILIBRATION AND ITS SIGNIFICANCE FOR CROP GROWTH
[摘要] Thenon-exchangeablepotassiumreleasedbysoilafterequilibrationwithcation-exchangeresinwasdeterminedbyextractionofthemixturewithneutralammoniumacetateatroomtemperatureandcomparedwithasimilarextractionintheabsenceofresin.Thedifferenceobtainedfollowinga2-dayequilibrationperiodwascalledmoderately-availablepotassium.Simplelinearregressionofyieldonexchangeablepotassiumorexchangeableplusmoderately-availablepotassiumaccountedforonly16and27percentrespectivelyofthevariabilityinyieldresponseofcorn,wheat,oatsandpotatoestopotassiumfertilizerinthefield.Multiplelinearregressionofyieldonexchangeableandmoderately-availablepotassiumaccountedforanaverageof37percentofthevariationincropresponse;butamultiplequadraticregressionofLog(100-percentyield)onexchangeableandmoderately-availablepotassiumaccountedforanaverageof56percentofthevariabilityinLog(100-percentyield).Multiplequadraticregres...
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[效力级别] [学科分类] 农业科学（综合）
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