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《Acta Prataculturae Sinica》 2009-03
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Effects of phosphate fertilizer on utilization of non-structural carbohydrate in resident tissue of Medicago sativa during the early regrowth stage

JIANG Hui-xin1,2,SHEN Yi-xin1,ZHAI Gui-yu2,LIU Xin-bao1,YUAN Pei-xun2(1.College of Animal Science and Technology,Nanjing Agricultural University,Nanjing 210095,China;2.General Station of Animal Husbandry of Shandong Province,Ji'nan 250022,China)  
A field experiment was conducted to study the effects of phosphate fertilizer on utilization of non-structural carbohydrate(NSC) stored in the main root,crown,and stubble of alfalfa(Medicago sativa) during early regrowth after defoliation.NSC is mainly stored in the root and crown.A great deal of starch,the major component of stored NSC,was utilized during early regrowth.With increasing rates of phosphate fertilizer,starch reserves increased in the main root and crown and at 270 kg P2O5/ha starch reserves were 73.5% and 31.1% higher respectively than those in the control.Phosphate fertilizer improved the activity of α-amylase and accelerated the hydrolyzis of starch in the main root and crown,thus promoting regrowth by enhancing mobilization of starch reserves for emergence of dormant buds and new shoots after defoliation.The dry weight of plants treated with 270 kg P2O5/ha was significantly(P0.01) greater than the control 13 days after defoliation.NSC in the main root and crown of alfalfa is the main source of nutrients during early regrowth and phosphate fertilizer improved the storage and conversion efficiency of NSC thus accelerated regrowth of alfalfa after defolition.
【Fund】: 山东省农业良种产业化项目(2005LZ13-03 2006LZ12-03)资助
【CateGory Index】: S541.9
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