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1、州南人學(xué)碩十學(xué)位論文ABSTRACTStudyonLeakagelossandutilizationofPotassiuminPurplesoilDiscipline：PlantnutritionAuthor：MengTaoSupervisor：ShiXiao-junProfessorABSTRACTPotassiumisoneofthethreenecessaryelementsforplants．Therearcimportanteffectsonincreasingyields，improvingq
2、uality，intensifyingstressresistanceofcropsbyreasonablefertilizationofpotassium．Ourcountryisshortofpotassiumresourc∞．The90percentofpotassiumfertilizerdependonimportant．Andthe糊soffarmlandswhicha∞shortofpotassiumarcincreasing．Howtoincreasepotassiumutilizatio
3、nanddecreasethelossofitattractthecommonlyattentionofpeople．Thelossofsoilpotassiumincludesrunofflossandleakageloss．Researchesabouttherunofflossarcexcessive．TheleakagelossofpotassiumwassmdiedinlatosolandredsoilWhileresearchabouttheleakagelossofpotassiuminpu
4、rplesoilwithrice-wheatrotationsystemisinsufficienLInordertoprovidescientificfoundationforthereasonableapplicationofpotassium,andreducelossofitinrice—wheatrotationsystem．Thispaperstudiestheleakageleachingofpotassiuminrice-wheatrotationsysteminthreetypesofp
5、urplesoilbyusingnutrientpercolationpondfacilities．Italsoanalysisestheeffectsofdifferentpotassiumratesonyield，qualityandpotassiumutilizationofficeandwheat．Themainresultsareasfollows：hthegrowthstageofwheat,theleakagelossconcentrationofpotassiumde．clinedwith
6、thegrowthofwheat．hitheearly70days,theleakagelossconcentrationofpotassiumwashigh,thengraduallyreduced．Thechangeregulationabouttheleakagelossconcentrationofpotassiuminneutrasoil，acidicsoiland．calcareoussoilwerethesame．Inthegrowthstageofwheat,theleakagelossc
7、oncentrationofpotassiumwasintherangeof3．0kg／hlu2～8．8kg／hm2，theevemgeWas5．1kg／hm2．Soilpropertiesaffectedtheleakagelossofpotassium．Theleakagelossconcentrationofpotassiumwcre3．Tkg／lml2，3．4kg／hm2and8．4kg／hm2ollaverageinacidicpurplesoil，inneutralpurplesoilandi
8、ncalcareouspurplesoil，respectively．Theleakagelossconcentrationofpotassium111州南人學(xué)碩十學(xué)付論文ABSTRACTwashigherinacidicpurplesoilthaninneutralandcalcareouspurplesoil．theincreasedegreewas147％，1270．respectively．Theapplication
