钾对设施土壤吸附特性及西瓜阳离子吸收和品质的影响

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1、钾对设施土壤吸附特性及和西瓜阳离子吸收和品质的影响摘要试验研究了钾的不同施用剂量对设施土壤阳离子吸附特性西瓜阳离子吸收及西瓜产量品质的影响-1结果表明对照不施钾K0和低钾K1166.7kgha处理时土壤水溶性钾及交换性钾均低于施钾前的相应含量土壤各钾素形态均有一+2+定的耗竭K1处理低钾施用减少了根系对NaMg的吸收随着-1-1钾施用量的增加在K3500.0kgha和K4666.7kgha处理时++2+2+土壤交换性K含量上升交换性NaMgCa含量降低高钾K3K4处理时土壤水溶液电导率显著提高不利于西瓜对养分的平衡吸收钾对西瓜阳离子吸收效应试验表明施

2、钾显著促进了西瓜各生物组+织中K的含量钾和钠在对照及低钾K1处理时表现为生理替代作用随着施钾量的增加钠在植株体内的含量逐渐下降钾对钙的作用较为复杂在低钾处理K1时钾的施用促进钙的吸收钾施用量增加后植株体内钙含量下降钾对钙表现颉抗作用镁在西瓜体内四种阳离子中含量最低低钾K1处理时镁的含量略有回升随着钾施用量的增加植株体内镁的含量下降施钾对西瓜品质具有显著的促进作用施钾对西瓜的外形单瓜重还是对品质指标旋光性糖和维生素C含量都存在显著或极显著效应但在高钾施用时西瓜产量和品质无显著差异温室西瓜生长过程中应-1控制钾施用量在K2处理的333.3kgha以下以保

3、持土壤水溶性盐基含量不至过高这对减少设施温室西瓜土壤的次生盐害发生促进优质高产西瓜生产具有最佳的经济效应和土壤生态效应关键词钾用量设施土壤吸附性状阳离子吸收西瓜产量品质IEFFECTOFPOTASSIUMDOSAGEONADSORPTIONCHARACTERISTICSOFSOILANDTHECATIONUPTAKEANDQUALITYOFCULTIVATEDWATERMELONINGREENHOUSEABSTRACTThispaperstudiedtheeffectofpotassiumdosageontheadsorptionofthesoils

4、,cationuptakeandyield,qualityofthewatermeloncultivatedinthegreenhouseinShanghai.++TheresultshowedthatsoilwatersolubleKandexchangeableKcontentwaslowerthanthecontentbeforepotassiumapplication,undernopotassiumapplicationandK1-1treatment(166.7kgha).Wefoundthatthecontentofsoilpotass

5、iuminvariableformsdecreasedtoacertainextent.LowpotassiumdosageapplicationasK1treatmentlowed+2+theuptakeamountofNaandMgbytheroots.Withtheincreaseofpotassium-1-1applicationdosageasK3(500kgha)andK4(666.7kgha),thecontentofsoil++2+2+exchangeableKincreased,whilethecontentofexchangeab

6、leNa,MgandCadecreased.Highdosageofpotassiumapplicationsignificantlyincreasedtheelectricconductivity(EC)valueofwaterextractantofsoils,whichhadadisadvantageouseffectontheuptakebalanceofthecations.Accordingtotheexperimentoftheeffectofpotassiumdosageonthecationuptake+characteristic

7、s,wefoundthatpotassiumsignificantlyincreasedthecontentofKintheplantorgans.UndertheK0andK1treatment,sodiumtendstobesubstituteforpotassium.+ThecontentofNawasdeterminedtobethehighestintherootunderK0treatment,while+graduallydecreasedwiththeincreasingdosageofpotassiumapplication.The

8、effectofK2++ontheCauptakewasalittlecomplicatedasreport