氮素形态及ph对马铃薯块茎生长影响

《氮素形态及ph对马铃薯块茎生长影响》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、摘要以马铃薯克新一号和夏坡蒂为供试品种，通过两年氮素形态处理试验，从植株地上和地下部分的干物质积累、分配，植株光合生产率，单个块茎的库强，养分吸-+收和分配等方面，研究了不同形态氮素（NO3、NH4）及比例对马铃薯块茎形成和膨大生长的影响，通过一年的不同pH处理实验，分析了pH对马铃薯植株、匍匐茎、块茎生长的影响。试验结论如下：1氮素形态对马铃薯块茎形成及生长发育的影响因生育阶段而异。硝态氮利于马铃薯植株块茎形成之前植株地上部分建成，有利于为块茎形成；铵态氮有利于后期植株地上部分物质积累、叶面积增加、植株光合速率的提高，促进大薯的形成。2在pH3.8～pH7.8条件下，随着介

2、质pH的升高，马铃薯组培苗（克新一号）的鲜重增加，马铃薯匍匐茎长度增加，块茎重量减小，与氮素形态对马铃薯生长发育的影响有一定的一致性，因此氮素形态引起植株根际酸碱度的变化可能是影响马铃薯块茎生长发育差异的原因之一。关键词：马铃薯；氮素形态；pH；块茎形成；块茎膨大TheInfluencesofNFormsandpHonPotatoTuberGrowthAbstractToresearchtheeffectsofNformsonpotatotuberformingorgansgrowthandfurtherstudytheinvolvementmechanism,alocalp

3、otatocultivarKexin-IandShepody-+-weretheaimedmaterials.Twoorthreenitrogenforms(NO3,NH4,orNO3:+NH4=50:50)wereappliedinthepotsandcultureexperimentsingreenhousefrom2010to2011.Theplantdrymatteraccumulationanddistribution,tuberformingorgansmorphologyandplantnitrogenabsorptionanddistributiondurin

4、gtheplantdevelopmentwerestudied.OneyearexperimentwithdifferentpHtreatmentconductedin2012.Theresultsfollowedas:-1Duringthetuberformingperiod,NO3benefitedforplantdryaccumulationand-thephotosyntheticproductionrate,soNO3stimulatethetuberforming;aftertuberization,+NH4startedstimulatedtheplantdry

5、matteraccumulation,theleafareaandplantheight,aswellasphotosyntheticproductionrate,sinkstrengthandpertuberbulkingrate,and+-NH4wasbenefitfortuberbulkingcomparedwithNO3.2PlantfreshweightswereincreasedwithpHincreased,Kexin-IcultivarstolonlengthwereincreasedwithpHincreased,however,therewasonlysi

6、gnificantdifferencebetweenpH3.8andpH6.8,itshowedthatpotatocouldadaptawidepHscope,andthe-+differenceofpotatoplantgrowthcausedbyNO3andNH4wasduetothechangesof-+rhizospherepHchangesafterNO3andNH4absorptionbyplants.Keywords:Potato；N-forms；pH；Tubeforming；TuberbulkingDirectedby:Prof.FANMingshouApp

7、licantforMasterdegree:GAOYuan(Botany)(CollegeofAgronomy，InnerMongoliaAgriculturalUniversity，Huhhot010018，China)目录1引言...................................................................11.1环境因素对马铃薯块茎生长的影响.....................................11.1.1温度对块茎生长的影