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IntroductionInricepaddyecosystem,theresearcheshavebeenfocusedonthefollowingfields:1.Changeofriceplantingsystemsinricepaddyecosystems2.Changetrendofricetotalyieldnear50yearsinHunanprovince3.Changetrendofricegrainyieldofunitareanear50yearsinHunanprovince4.Changeoffertilizerapplicationamountnear50yearsinHunanprovince5.Therelationshipofbetweenfertilizerapplicationandtotalricegrainyield6.Therelationshipofbetweenricegrainyieldofunitareaandfertilizerapplicationquantity7.Changeofricegrainyieldunderfertilizerapplication8.Riceyieldbenefitunderdifferentfertilizationmodel9.Riceyieldbenefitunderdifferentfertilizationmodels10.Theannualvariationofirrigationeffectinthegrowthofdouble-croprice(1989~1998,inTaoyuan,Hunan)11.Thecumulativeeffectofcolonyphotosynthesisinricebootinginthedifferentwatermanagement(in2000)12.TherelationshipofplanttranspirationrateandleafporousconductanceConclusionThankyouverymuch!
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