节水灌溉下旱稻水肥利用的研究与oryza2000模型的应用 (1)

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1、望主查些查兰堡主兰堡堡苎!!!i生!旦——AbstractThesubjectisbasedonthewater-savingirrigationforriceandhadmadeastudyontheeffectofdensityandN．-fertilizeranddifferentwater-savingmethodsonuplandricewithasplit-plotexperiments．111eexperimentswereperformedinHuibeiwaterresourcesscienceexperimental

2、stationinKaifeng，Henanprovincein2004．Themaintreatmentwasirrigationregimes(Wl：water—savingirrigation(Flushingirrigationat一30kPa)，W2：Rainfedwithsurvivalirrigation)．Thesub—treatmentisN—fertilizerapplicationratefNl：225kgN／hm2；N2：300kgNIbm2)．Thesub—subtreatmentwasdensity(DI：s

3、pacingbetweenrOWSwas30cm；D2：spacingbetweenrowswas24cm)．ThevarietiesoffertilizersareN—urea，P-Ca(H2P04)2，K—KCl，Zn—ZnS04，Fe—FeS04．Themainresultswerebelow：1．Inthisstudy,leafareaindex，panides／m2，biomassofleavesandstemswerehigerinhighdensitythaninlowdensity．However,therootleng

4、th．biomassofrootandratioofroottoshootwerehigherundertheW2treatmentwimrelativelesswaterthanthoseundertheWItreatmentwithrelativemorewater．Therearcnodifferencesforplantheightamongthealltreatments．2．ThereWasauendthatnitrogencontentofroot，stemandleafintheW2treatment埘t11relati

5、velesswaterwerehigherthanthoseintheWItreamaent、vimrelativemorewaterrespectly,especiallyinthevegetativegrowthstage．However,therespectiveN—cumulantinroot，stemandleafwerehigerinthehighdensitythaninthelowdensitytreatment，AmongtheN·fertilizertreatments，nitrogencontentandN-cum

6、ulantwerehighcrinhi曲N-fertilizertreatmentthaninlowN·fertilizertreatment，duringtheearlygrowthseasonsbutnOdifferencesduringthelategrowthseasons．ThepercentageofNingrainwashigerinlowN—fertilizertreatmentthaninhighN-fertilizertreatment．3．Comparingtheyieldcomponents，thepanicle

7、sNo．／m2Washigherinhighdensitytreatmentsthaninlowdensitytreatments；andhigherinlowN-fertilizertreatmentthaninhighN—fertilizertreatment．Howeverthefilledgrainsnumbersperpaniclewasjustcontrary．耵legrainyieldhadasimilarregulationtothatofpaniclenumbers／m2．butthethousandgrainweig

8、htandthefilledgrainratehadnodiffierencesbetweendifferenttreatments．Inthisstudy,theoptimumN-applicationr