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Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (30): 127-132.doi: 10.11924/j.issn.1000-6850.2014-1543

Special Issue: 水稻

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Effects of Nitrogen Rate on Yield and Nitrogen Use Efficiency of Super Rice‘Songjing 9’

  

  • Received:2014-05-30 Revised:2014-05-30 Accepted:2014-06-17 Online:2014-10-31 Published:2014-10-31

Abstract: The effects of different nitrogen rate on yield and nitrogen use efficiency of super rice‘Songjing 9’were studied using‘Songjing 9’as material by experimental plot comparative field, in order to discuss the relationship of nitrogen rate with dry matter accumulation, yield and nitrogen use efficiency of‘Songjing 9’, make the optimum amount of nitrogen fertilizer clear and explore its potential in yield increase of super rice production. The results indicated that, the dry matter accumulation of aboveground plant and nitrogen uptake increased with the increase of nitrogen rate during rice full heading time. Dry matter accumulation of aboveground plant and nitrogen uptake increased first and then decreased with nitrogen rate increased during maturation period. Nitrogen use efficiency decreased with nitrogen rate increased. The yield increased first and then decreased with nitrogen rate increased. Yield had highly significant positive correlation with rice and dry weight of plant at maturation period, rice nitrogen in full heading stage and nitrogen content of spikes and plant in mature stage, and had significant positive correlation with nitrogen physiological efficiency. The highest yield of‘Songjing 9’could be realized when nitrogen rate was 195 kg/hm2.