简介：Anincubationexperimentwascarriedoutinlaboratorytostudytheeffectoftemperature,moisture,phosphorus,organicmatter,croppingandpreviouselementalsulfurapplicationonelementalsulfuroxidationinfourselectedsoils,fluvo-aquicsoil,blacksoil,yellow-brownsoilandredsoil,Inallthesoilstested,sulfuroxidationratewasinfluencedbytemperatureandthetemperaturecoefficient(Q10)valuesattherangefrom10to30℃were4.41,,6.19and3.71forthefoursoils,respectively.Therateofsulfuroxidationwasparabolicallyrelatedtosoilwatercontent.Theoptimummoisturecontentforthemaximumoxiationratewasdifferentamongsoils,Phosphorusincreasedtheoxidationrateofelementalsulfurby57.7%,33.1%,21.7%and26.4%fortheabovefoursoils,respectively,comparedwiththecontrol(nophosphorusapplied).Organicmaterialofcornstrawwhichwasgoundandpassedthrougha0.5-mmsievealsoincreasedthoxidationrateofelementalsulfurinthefoursoilsby59.8%,7.8%,39.2%and540.4%,respectively.Elementalsulfurwhichwasappliedpreviouslytosoilssignificantlyenhancedtheoxidationofelementalsulfursubsequentlyaddedandincreasedsulfur-oxidizingpopulationssuchasautotrophicelementalsulfuroxidizerswithpHoptimum6.8,autotrophicthiosufateoxidizerswithpHoptimum6.8,heterotrophicthiosulfateoxidizersandheterotrophicsulfateproducers.Croppinghadlittleeffectonelementalsulfur-oxidizingpotentialityofsoils.

简介：Overaperiodoftwoyears,fieldexperimentswereconductedontwosiltyloamsoilsgrownwithfoursolanaceousvegetablecropsofeggplant(var.serpentinumBailey),tomato(var.communeBailey),sweetpepper(var.grossumBailey)andchilli(var.lengumBailey),respectively.Eachexperimentincludedfourtreatmentswithfromlowtohighdoses,0～450kgha-1foreggplant,tomatoandsweetpepper,and0～270kgha-1forchilli,ofKfertilizersintheformofsulfateofpotash(SOP)appliedtogetherwithNandPfertilizers.OneCKtreatmentwithoutK,NandPfertilizersappliedandonetreatmentofKfertilizerintheformofmuriateofpotash(MOP)appliedatthehighlevel(450kgha-i)togetherwithNandPfertilizerswereincludedintheexperimentsofeggplant,inordertocomparetheeffectsofSOPandMOP.ThefruityieldsofthetestedcropsincreasedsignificantlywiththeincreasingrateofKapplication.ThecropssuppliedwithKfertilizersyieldedmorestablyastheCV%oftheiryieldsdecreasedwiththerateofKapplication.ThedrymatterandvitaminCcontentsinfruitsoftomato,sweetpepperandchilli,andthesugarcontentandthetitratableacidityleveloftomatofruitswereincreased,andtheS/Aratio(ratioofsugarcontenttotitratableacidity)oftomatofruitsweredecreasedbyKfertilization,indicatingthatKfertilizationcouldimprovethefruitqualityofthesolanaceousvegetablecrops.However,thehighrateofKfertilizermightlowerthedrymatterandvitaminCcontentsoftomatofruitsandsweetpepperfruits.SOPwasmoreeffectivethanMOPinincreasingtheyieldandqualityofeggplantfruitsatthehighfertilizationrate;therefore,thechoiceofapplyingSOPmaybebetterforhighlevelsofKfertilization.