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《Journal of Gansu Agricultural University》 2015-01
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Effects of nitrogen forms on growth characteristics of alfalfa at different growth stages

YE Fang;LIU Xiao-Jing;ZHANG Jin-Xia;College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S.Centers for Grazingland Ecosystem Sustainability;  
Under the condition of complete nutrient solution,the cultivation of the whole growth period by sand culture,the effects of three kinds of nitrogen forms(nitrate nitrogen,ammonium nitrogen and nitrate nitrogen,ammonium nitrogen is 1∶1)and three nitrogen levels(0,105 and 210mg/L)were studied on growth characteristics of alfalfa‘Gannong No.3'at different growth stages.The results showed that different nitrogen treatments had significantly higher on plant height,aboveground biomass,underground biomass,nodule number and nodule weight than those of CK,NO-3-N and NH+4-N mixed culture showed the best,then NH+4-N training,and NO-3-N training was the lowest.Along with the increase of nitrogen level,various forms of plant height,aboveground biomass,underground biomass,nodule number,nodule weight showed a trend of increasing.The plant height,aboveground biomass,underground biomass,nodule number,root nodule weight reached a maximum in NO-3-N NH+4-N when the concentration at 210mg/L.Theindexes of plant growth under different treatments showed significantly different in seedling,budding,flowering periods;however,not significant different was found in seed podding and podding periods.It is suggested that the growth index of alfalfa have different degree of correlation.
【Fund】: 甘肃省财政厅项目“外源氮素供应对紫花苜蓿产量和品质形成影响研究”;; 草业生态系统教育部重点实验室(甘肃农业大学)项目“供氮水平及氮素形态对紫花苜蓿养分吸收及根瘤特性的影响研究”(CYZS-2011012)
【CateGory Index】: S541.9
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