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《China Rice》 2016-01
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Study on Accumulation Characteristics of Nitrate-N and Ammonia-N in Grain of Rice and Regulation of N-fertilizer

SUN Lulu;ZHU Linan;ZHENG Guanlong;ZHU Fangxu;GUO Xuedong;Lugo Oke;ZHANG Zhongchen;JIN Zhengxun;Agricultural College, Northeast Agriculture University;  
Based on the field and pot culture experiment of five japonica rice varieties, the content and distribution character of nitrate-N and ammonia-N in the endosperm, their variable trend during the grain filling period and the correlations of N-fertilizer with the enzyme activity of GS among different varieties were analyzed. The results indicated that there was a difference between nitrate-N and ammonia-N content in the mature grain among the rice varieties. The content of ammonia-N is higher than nitrate-N, which both mainly located in rice bran and showed a decline trend from outside to inside. Increasing the N-fertilizer amount led to the increase in the nitrate-N and ammonia-N level by 114.1%~203.0% depending on different varieties; As application of N-fertilizer level raised,each content showed a significant growth. During the filling period, the nitrate-N content in endosperm kept raising until the mature stage, while the accumulation amount of nitrate-N and the content of ammonia-N showed a unimodal curve trend with peak value appearring at the 25 th day after heading. Comparing with low nitrate-N content varieties, the daily average growth of nitrate-N was extremely higher than the high content varieties. However, the daily average growth of ammonia-N was lower than the high ammonia-N content varieties at early grain filling stage, but higher at late stage than the low Ammonia-N content varieties. The enzyme activity of GS showed significant difference among different variaties at each stage, having a outstanding positive linear correlation to the content and accumulation rate of ammonia-N and nitrate-N.
【Fund】: 科技部“十二五”科技支撑计划项目(2011BA D16B11-02YJ02);; “十二五”农村领域国家科技支撑计划项目(2013BAD20B04-2S)
【CateGory Index】: S511.22
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