寧夏枸杞氮磷鉀營養(yǎng)與合理施肥技術(shù)研究.pdf

1、102276l寧夏大學(xué)學(xué)位論文寧夏枸杞氮磷鉀營養(yǎng)與合理施肥技術(shù)研究ResearchofN，P，KNutritionandRationalFertilizatioⅡTechniquesforMedlarofNingxia研冤生：奎壁指導(dǎo)教師r扭藍(lán)盎熱援申游學(xué)位『1類級別：盤生耍虧業(yè)名稱：拄物藏籃堂皇越掛堂研究方向佳物藍(lán)日B塹l鏖所正學(xué)院：垂生喧——2006年4月AbstractFertilizerfieldexperimentandtes

2、tinganalysiswereconductedtostudythevariationsofnitrogen，phosphorusandpotassiumcontentsinmedlarplantsinyearlycycle，theabsorptionratesofN，P，KnulrientsinperforminglOOkgfruitsindryweight，therationalapplyingrates，proportionsa

3、ndapplicationtechniquesofN，P，KfertilizersinZhongningcountyofNingxiaTheresultsobtainedareasfollows1ThecontentsofNPKnutrientsinfiadts，branchesandlcavesofmedlarweremeasuredatdifferentstagesinyearlycycleThechangingcharacters

4、ofNPKcontentswerepreliminarilygainedFromthefLrsttendaysofAprilt0theendofMay，NPKcontentsinbranchesandleaveswerehigher，theaveragecontentsofNP20sandK20reached279％，006％099％DuringthemiddleofJunetothebeginningtendaysofJuly，the

5、treeblossomedandfruited，NPKnutrientstransfcnedfrombranchesandleavestofruits，thecontentsofNPKinbranchesandleavesdecreased，andwhichinfruitswereincreased(thecontentofN，P2如，K20reached182％，O56％，100％respectively)：InJuly，becaus

6、eofblossomingandfruitingaloLlotsofnutrientswereconsumed，Sothecontentsinfruit，branches，andleavesdeclinedgraduallyFromtheendofJulytoAutumn，therootsystemsenteredthesumlnerdormancystate，thecontentsinbranchesandleaveswerelowe

7、rAtthebeginningofSeptember，therootsystemsbegantorecovery，thecontentsinbranchesandleavesincreasedDuringthelasttendaysofSeptembertothefirsttendaysofOctoberitwasproductivephaseinfall，thecontentsinfruitwerehigher，thecontents

8、ofN，Pz％，K20were147％，024％，083％respectivelyonaverageThecontentsofN，P20s，K20f159％，048％，077％)infruitonaverageinsuminerwerehigherthanthat(127％，016％，057‰infall230medlartreeswhichhadsimilargrowthcharacterswereselectedandthebran

9、chesleaves，andfruitsprunedinthisyearwerecollected，atthesametimethenitrogen，phosphorusandpotassiumcontentsinthemweremeasuredTheresultsshowedthatthequantityofN。P20s，K20absorbeAbyabovegroundinperforming100kgdryfruitofmedlar

10、were225kgt105kg，117kgrespectively，theproportionofNtoP20stoK20was100toO46to0523TheresultsoffertilizereffectexperimentsshowedthattherelationbetweenapplicationratesofNPKandyieldsofmedlarwasaparabolicform，namely，increasedfas

11、tanddecreasedlaterasawhole，thecurvecouldexpressbyquadricequationinonevariableWheninordertopursuehigllyield，therecommendedfertilizationramsofN，P20s，K20were7346kg／hm2，3492kg／hm2，2812kg／hm2。respectively111eratioofNtoP205toK

12、20was100toO48t0038Wheninpursuitofeconomicefficiencyasgoals，recommendedusingtheoptimumeconomicfertilizationasthetoplimit，namelyapplicationratesofN，P205，K20were6864kgthra2，3262kghm2，2641kg／hm2respectively耵leratioofNtoP205t

13、oK20was100to047toO38inpracticetinordertoobtainmaximumeconomicefficiencyrecommendadoptingtheoptimumeconomicfertilizationButoptimumeconomicfertilizationalwayswasinfluencedbyprizeofproducts，fertilizersandsoilconditionsandso

14、onSo，theoptimumeconomicfertilizationshouldbeadjustedaccordingt0thespecificconditions4TheresultsofthesoilprofilesobservedexperimentindicatedthattherootmorphologywasobviouslydifferentbetweendifferentagesWiththeincreaseofag

15、es，thenumber，depthoftoprootsandfibrousrootsystems，distributionlayers，thediameteroftreecrownwereincreasedThesoilnutrientcontentsatdifierentagesinMedlarOrchardsweremeasured，theresultsshowedthatwiththeincreasingofages。thenu