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《Agricultural Research in the Arid Areas》 2008-05
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Effects of different nitrogen fertilizer ratio on key enzymes activities of carbon metabolism and forage rice yield under water-saving condition

XIE Gui-xian,LIU Qiang,RONG Xiang-min,SONG Hai-xing,PENG Jian-wei,ZHU Hong-mei(College of Resource & Environment,Hunan Agriculture University,Changsha,Hu'nan 410128,China)  
Field experiment combining with laboratory analysis were conducted to study the effects of three different nitrogen ratio fertilizer methods(medium nitrogen ratio fertilizer method—the ratio of N,P2O5,K2O is 190,90,100 kg/hm2,high nitrogen ratio fertilizer method—N,P2O5,K2O is 210,90, 100 kg/hm2 and low nitrogen ratio fertilizer method—N,P2O5,K2O is 170,90,100 kg/hm2) on key enzymes activities of carbon metabolism and forage rice(Weiyou 198) yield under water-saving condition in 2003 in Changsha city.The results showed that,the activities of sucrose phosphate synthase(SPS),sucrose synthase(SUS) and ADP-glucose pyrophosphorylase(ADPase) in flag leaves and grains,the net photosynthesis rate in flag leaves,the content of sucrose in flag leaves and grains,the ability of sucrose was converted into starch were improved significantly by medium nitrogen ratio fertilizer method compared with those of High Nitrogen Ratio fertilizer method and Low Nitrogen Ratio fertilizer method.In compared with the high nitrogen ratio fertilizer method treatment and low nitrogen ratio fertilizer method treatment,the effective spikes under medium nitrogen ratio fertilizer method were increased by 7.70% and 10.32%,and grains yield were increased by 12.02% and 8.47%,respectively.The medium nitrogen ratio fertilization method was suitable for high protein forage rice cultivation.
【Fund】: 国家十五攻关项目子专题(2001BA507A)
【CateGory Index】: S511
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