简介：1.BackgroundFarmers’fieldschoolisamethoddevelopedbyFAOregionalpestintegratedmanagementproject,itprovidesfarmers,inconnectingwithfarmers’needsandaimingatexistingproblems,withopportunitiesof"learningfrompractice",enablingthemtoparticipateinfieldtests,seminars,decision-makingandplanning,strengtheningth

简介：Amongthefourskillsofllstening,speaking,readingandmentasquicklyasPOssible,theactualsconngdtbetesthaswnting,theskillofspeakingmaybe

简介：Theeffectsofnitrogen,phosphorusandpotassiumapplicationlevel,seedrateandtransplantingdensityonthegrowthanddevelopmentofriceplantswerestudiedtofindoutnutrientstatusinhigh-yieldingriceplantsandtoincreasegrainyieldbyadequatefertilization.Therewasanequilibriumrelationshipamongnutrientelementsforhigh-yieldingriceplantpopulations.Theequilibriumindexofnutrientamount,contentanddistributioninhigh-yieldingriceplantsshouldbegenerallygreaterthan-2butlessthan2.Theoptimumnutritiveproportionofnitrogen:phosphorus:potassiumassimilatedbytheplantswasabout10:2:9attheripeningstage.Butthecontentandtheproportionvariedwiththegrowthstages,Therefore,thenutrientinriceplantpopulationsshouldbeinadynamicequilibrium.Soastoachievehighyield.

简介：Twonewlybredhybridricecombinations,superhigh-yieldingLiangyoupeijiu(Pei'ai64S×9311)andPei'ai64S/E32(Pei'ai64S×E32)wereusedtoinvestigatethephotosyntheticcharacteristicsunderhightemperatureincomparisonwithhybridriceShangyou63.Hightemperaturecausedadecreasedphotosyntheticefficiencyandaggravatedphotoinhibition.TheoptimumtemperatureforphotosyntheticelectrontransportationandphotosyntheticCO2fixationwereabout28℃and35-40℃respectively.Linearelectrontransportationismoresensitivetohightemperaturethanthephotochemicalprocess.Themechanismofhightemperatureadaptationwaspossiblyasfollows:superhigh-yieldingricehasquicklyincreasingcarotenoid,whichactedasamorefavorableantioxidantsystemtoreducetheactiveoxygenproductionandavoiddamagetothephotosynthesissystem;superhigh-yieldingricehasahigherefficiencyofxanthophyllscycletodissipateexcessheatenergy;superhigh-yieldingricehasamorestablephotosyntheticfunction,higherphotosyntheticefficiencyandmoreheatstableproteincontent.

简介：Thechangesofclaymineralassociationafterhigh-gradientmagneticseparation(HGMS)treatment,andtheeffectsofchemicalandphysicaltechnologiesonconcentratingFeoxidesformiansoilsincentralandsouthernChinawereinvestigatedbymeansofX-raydiffraction(XRD)andchemicalanalysismethods.ResultsindicatedthattheconcentratingtimesofFeoxidesbyHGMStreatmentwerethelargestfor0.2-2μmsizefractionintheexaminedsoils.Forthesoilsinwhich2:1phyllosilicatesweredominant,concentratingtimesofironoxidesbyHGMStreatmentwerelargerthanby5molL^-1NaOHtreatment.Phyllosili-catesweredecreasedafterHGMStreatment;however,thedecreasewaslessthanthatofkaolinite,Thegoethite/(goethite+hematite)valuesinFeoxidesofthesoilskeptvirtuallyconstantafterHGMStreatment.

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简介：Effectsofcolumntemperatureandflowrateonseparationoforganicacidswerestudiedbydeterminingninelow-molecular-weightorganicacidsonreversed-phaseC18columnusinghighperformaceliquidchromatography(HPLC)withawavelengthofUV(ultraviolet)214nmandamobilephaseof18mmolL^-1KH2PO4buffersolution(pH2.1).Thethermalstabiltiyoforganicacidswasdeterminedbycomparingtherecoveriesoforganicacidsindifferenttemperaturetreatments.Therelationshipsbetweencolumntemperature,flowrateorsolventpHandretentiontimewereanalyzed.AtlowsolventpH,separatioinefficiencyoforganicacidswasincreasedbyraisingtheflowrateofthesolventbecauseofloweringtheretentiontimeororganicacids.Highcolumntemperaturewasunfavorablefortheseparationoforganicacids.Theseparatingeffectcanbeenhancedthroughreducingcolumntemperatureinorganicaciddeterminationduetoincreasingretentiontime.Highthermalstabilityoforganicacidswithlowconcentrationswasobservedattemperatureof40℃-45℃,SensitivityandseparationeffectoforganicaciddeterminationbyHPLCwereclearlyimprovedbyacombinationofraisingflowrateandloweringcolumntemperatureatlowsolventpH.

简介：Methodsfordeterminingnienelowmolecular-weightoragnicacidsinrootexudatesweredevelopedbyusingreversed-phasehighperformanceliquiedchromatographywithUV(ultraviolet)detectionat214nm.Themobilephasewas18mmolL^-1kH2PO4adjustedtopH2.25withphosporicacidndtheflowratewas0.3mLmin^-1,Theanalyticalcolumnwasareversed-phasesilicabasedC-18column(shim-packCLC-ODS).Therootexudateswerecollectedthroughsubmergingthewholerootsystemintoaerateddeionizedwaterfor2hours,Thefilteredexudatesolutionswereconcentratedtodrynessbyrotaryevaporationat40℃,dissolvedin10mLmobilephase.Thechromatoraphicconditionsoforganicaciddeterminationwereanalyzed.Theresultsshowedthattherewasahighselectivityandsensitivityintheorganicaciddeterminationbyreversed-phasehighperformanceliquidchromatography.Coefficientsofvariationfororganicacieddeterminationwerelowerthan10%exceptlacticacid.Therecoverieswereconsistentlybetween80.1%to108.3%.Detectionlimitswereapproximately0.05to4.5mgL^-1fororganicacidsexceptsuccinicacidwiththedetectionlimitof7.0mgL^-1.Phosphorusdeficiencymaycontributetothereleaseoforganicacidsinsoybeanrootexudatesespeciallymalic,lacticandcitricacids.

简介：在flowering舞台被使用二装饰用的梨树米饭变化Koshihikari和Sasanishiki在天赋和高温下面学习以后，蔗糖，fructose，蔗糖synthase的葡萄糖内容和差别迟钝，vacuolar转化酶，和细胞壁的动态变化在米饭谷物绑了转化酶。在米饭谷物，蔗糖synthase活动比转化酶的高，它显著地与淀粉累积率被相关，显示蔗糖synthase起了在蔗糖降级和淀粉合成的一个重要作用。在高温下面，没有fructose和葡萄糖的任何增加的谷物蔗糖内容的重要增加满足，建议高温处理提高了蔗糖累积，当减少时在米饭谷物的蔗糖降级。与控制植物相比，在蔗糖synthase，vacuolar转化酶，和有高温的细胞壁界限转化酶的活动的减少对待显示的植物蔗糖降级的减速与在蔗糖synthase和转化酶的活动的减少有关。

简介：二细菌的老家(BB)抵抗基因，Xa21和Xa4，从IRBB24被介绍进杂交稻restorer线Mianhui725，它高度产生BB，由使用杂交和分子的帮助标记的选择技术。四根相应恢复系线通过与分子的标记测试R目标基因并且分析父母遗传背景被获得。有特定的紧张ofXanthomonasoryzaepv的四根线和他们的混血儿的接种。oryzae，P1，P6和七个代表汉语拉紧病理型，CⅠ-CⅦ，证明所有四根线和他们的混血儿是到BB的高度抵抗、介绍的宽广抵抗光谱。G46A/R207-2的混血儿显示了好农学的人物和高产潜力，并且R207-2被称为Shuhui207。