Chinese Journal OF Rice Science >
Effects of Rhizosphere Oxygen Concentration on Rice Grain Yield and Nitrogen Utilization
Received date: 2014-11-05
Revised date: 2015-03-10
Online published: 2015-07-10
Hydroponic experiments were conducted to reveal the effect of rhizosphere oxygen concentration on rice grain yield and nitrogen absorption and utilization with IR45765-3B(deep water rice), Zhongzheyou 1 (lowland rice)and Zhonghan 221 (upland rice) as material at four rhizosphere oxygen concentration levels, 1.0 mg/L (T1, hypoxia),3.0 mg/L (T2),5.5 mg/L (T3) and 7.5 mg/L(T4, saturated oxygen concentration).The results showed that under various rhizosphere oxygen concertrations the grain yield and dry matter accumulation significantly differed among cultivars, and followed a trend of T2>T1>T3>T4. For IR45765-3B and Zhonghan 221, the impact on grain yield was mainly due to grain number per panicle and seed-setting rate. For Zhongzheyou 1, it was due to the above two factors and effective panicle number. In case of nitrogen accumulation and utilization, the nitrogen absorption under T1 and T2 was enhanced during early growth stage. Aeration could increase N accumulation during late grain filling stage,but hinder N transferring to grain under excessive oxygen concentration. In addition, nitrogen utilization efficiency (NUE) in T2 was the highest, 6.9%,12.8%,13.8% higher than those in T1, meanwhile N dry matter production efficiency was enhanced due to rhizosphere aeration during vegetative growth stage. In all, rhizosphere oxygen concentration of 3.0mg/L effectively enhance grain yield and N absorption and utilization of three rice genotypes.
Key words： rice; rhizosphere oxygen concentration; grain yield; nitrogen utilization
Zhi-hua HU, Lian-feng ZHU, Yu-jiong LIN, Ji-jie HU, Jun-hua ZHANG, Qian-yu JIN . Effects of Rhizosphere Oxygen Concentration on Rice Grain Yield and Nitrogen Utilization[J]. Chinese Journal OF Rice Science, 2015 , 29(4) : 382 -389 . DOI: 10．3969/j．issn．1001G7216．2015．04．007
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