文档介绍：mg/kglowerthantheregion’saveragevalueof135mg/,whichis11mg/kglowerthantheregion’saveragevalueof32mg/,whichisfarhigherthanthedistrict’,theyieldperunitofrice’²,approachingthehybridrice’soutputlevelofthewholearea’,achievethestandardizationoffarmlandproductionandnormalizationoffarmlandfacilitiesandrealizethehigh-yield,high-qualityandhigh-efficiencyproductiongoal,thisthesisisaimedatfurthercultivatingasafeagro-ecosystemindustrychaintoobviouslyimprovethefarmland’ssoilpropertyinDongtan,effectivelyenhancesoilfertility,makefarmlands’engineeringfacilitiesmoreandmoreperfectandfarmlandecosystemsaferandsafer,achievethestandardofgrainfieldswithhighandstableyields,promotethesustainabledevelopmentofDongtan’:prehensiveimprovementtechnology,soilsaltcontent,pHvalue,nutrient,riceyieldIII万方数据目录摘要.....................................................................................................................................IABSTRACT........................................................................................................................II目录..................................................................................................................................IV1前言................................................................................................................................1课题的研究背景.........................................................................................................1坚守“18亿亩耕地”红线.....................................................................................1城市化进程中耕地流失,而复垦土地的土壤肥力差..........................................2土地资源的不可替代性,决定了我们必须珍惜土地资源..................................5滩涂地改良研究现状...........