摘要
Approximately70%oftheappliedureafertilizermaybelostintotheenvironment.Thislossisduetoleaching,decompositionandammoniumvolatilizationinsoil,waterandair.Throughcoating,theslowreleasetechnologycanbeusedtoreducelossesandtoincreasethefertilizerefficiency.Sulfurhasbeenusedasacoatingmaterial,butthecoatingcrackseasilybecauseofitsfriability,sometimesbeingpeeledofffromtheureasurface.Inthisstudy,fourtypesofmaterials,namely,gypsum,cement,sulfurandzeolite,weremixedandusedascoatingmaterialstosearchforthemosteffectiveandcheapcoatingmaterials.Theprimaryreasonsforselectingthesematerialswereimprovingfruitqualityandpreventingplantdiseases,providingaplantnutrient,increasingsoilfertilityandwaterretention.Thematerialswerealsoselectedbasedontheiravailability,processiblityandprice.Theeffectsofthecoatingmaterials,thickness,dryingtime,sievingandsealantonthecrushingstrengthanddissolutionrateofureawereinvestigated.Coatedureawiththesameproportionofgypsum-sulfurexhibitedhighcrushingstrengthandlowerdissolutionrate.However,theperformancewasfurtherenhancedbyapplyingmoltenparaffinwaxonthehotureasurface.SEMimagesdemonstratedthatthemicro-structureofgypsum-sulfurcoatedureaaftersievingresultedinasmoothercoatedlayer.Theefficiencyofthecoatedureawasimprovedby26%usinggypsum-sulfur(20%totalcoating),3%paraffinwaxandsievingthecoatingmaterialsbeforeapplication.
出版日期
2014年06月16日（中国期刊网平台首次上网日期，不代表论文的发表时间）
