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1、钾素水平对绿豆产量及养分吸收积累的影响李莉1展茗2万正煌1仲建锋1陈宏伟1(1.湖北省农科院粮食作物研究所,武汉430064;2.华中农业大学植物科学技术学院,武汉430070.)摘要:通过田间试验与采样分析研究了钾肥施用对绿豆氮磷钾吸收积累量和产量构成因子的影响。结果表明:绿豆植株中钾养分积累量随钾肥施用量的增加呈抛物线变化趋势,施钾提高了籽粒和茎杆中钾的积累量,其中钾素用量为90-135kg/hm2时,养分积累量最高。施钾(K20)45、90、145和180kg/hm2与不施钾相比平均籽粒产量分别增加40.4%、44.4%、50.1%和28.7%,荚果含钾量增加39.8%、80.5%、9
2、0.8%和39.2%,植株地上部钾素总累积量提高32.4%、39.2%、54.3%和30.7%。说明施钾能提高绿豆产量、提高荚果对钾素吸收和累积。施用钾肥效应方程为Y=838.25+7.5979X-0.0354X2(R2=0.954),说明合理施用钾肥,可以提高钾肥利用率和绿豆产量,施用过量则出现报酬递减。关键词:绿豆;钾肥;氮磷钾;产量EffectofPotassiumApplicationonYieldandNutrientAccumulationofMungBeanLiLi1,ZhanMing2,WanZhenghuang1,ZhongJianfeng1,ChenHongwei1(1I
3、nstituteofFoodCrops,HubeiAcademyofAgriculturalSciences,Wuhan430064;2CollegeofPlantScienceandTechnology,HuazhongAgriculturalUniversity,Wuhan430070,China.)Abstract:Throughthefieldexperimentandthesamplinganalysis,effectofpotassiumapplicationonN,PandKaccumulationandyieldcomponentofmungbeanwasstudied.Th
4、eresultsindicatedthattherewasaparabolaregularpatternofthenutrientaccumulationwhiletheapplicationrateofKincreased.ThetotalaccumulationofKinthemungbeanstemsandpodsincreasedwiththeapplicationofpotassiumfertilizer,andthemaximumwasat90-135kgha−1Kfertilizer.ComparedtonoKtreatment,theaverageyieldofthetrea
5、tmentwithK2Orates45,90,135and180kg/hm2increasedby40.4%,44.4%,50.1%and28.7%,andaverageKcontentinpodsincreasedby39.8%、80.5%、90.8%and39.2%,totalKuptakebytheabovegroundpartsofmungbeanaverageincreasedby32.4%、39.2%、54.3%and30.7%,respectively.TheresultsillustratedthatKapplicationincreasedtheyield.Theregre
6、ssionequationisy=838.25+7.5979X-0.0354X2(R2=0.954),showthatproperpotassiumapplicationcouldincreasemungbeanyieldandinprovetheutilizationefficiency,butexcessiveamountoffertilizerapplicationshouldreducethefertilizerusageefficiency.Keywords:Mungbean;Kapplication;N,PandK;Yield绿豆是湖北省丘陵和山地重要的杂粮作物之一,与其他作物相
7、比具有生育期短、适播期长、适应性广等明显的生理生态优势[1]。绿豆中的蛋白质是全价蛋白质,人体必需直接从食物中摄取的八种氨基酸在绿豆中含量十分丰富,是人们理想的营养保健食品[2]。近年来随着人们生活水平提高,绿豆作为医食同源作物,其需求量和消费量呈现出日益增加趋势。钾在作物生理代谢过程中功能特殊被赞誉为“品质元素”。钾在土壤中以KCL、K2SO4、KNO3等盐类形式存在,在水中则解离成K+而被根吸收[3]。在