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1“”“”2.N:P2O5:K2O1965:10.05201979:10.130.0331995:10.450.691998:10.50.2450%“”90%199830%0.540%21.3.“”C319992938tN2500t(P2O5)499t(K2O)32t?1.200010kg/kg7kg/kg5kg/kg1)1.41.3)3040—200045%90019001.2.NONO53%COCO2199238Cd5NO3-NO2-NO3-+2H++2eNO2-+H2O1520min6“”“”“”“”“”“”“”“”“”7Pesticides“”economicpoison“”agrochemicals“”“””biorationalpesticidesidealenvironmentalchemicalsbioregulatorsinsecticideanti-insectagentsenvironmentacceptablepesticidesenvironmentfriendlypesticidesØ5060803Ø5060t42mu()50%60%10%20%Ø10.8kg/hm210.41kg/hm2ØHgAsØ30ØØ19838Ø20aØØ1992199624734924612DDTØØØØØ91946DDT1951DDT7••“•••••10••••111.2070DDTs1.68mg/kg0.80mg/kg1980DDTs0.742mg/kg0.419mg/kg1985DDTs0.181—0.254mg/kg0.2220.273mg/kgDDT19501954195819621966197019741978198219861990199419982002050100150200250p,p'-DDEp,p'-DDTS-HCHS-DDTug/kgdw50505002.16598.5625.36DDT7.46628.6037.59OCPs0.92234.286.67p,p’-DDT11.35303.0511.35p,p’-DDE5002.4835.689.93HCHND7.024.40-HCHgg/kg/kggg/kg/kggg/kg/kggg/kg/kg2.••203.••1995533.4hm2•“”124.•••350.10.41(1980)0.0001-0.00450.02-0.01(1978)1.361.12(1980)0.10.44(1977)0.760.76(1980)0.370.37(1980)DDTDDTmg/kg)•qqqq