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《Journal of Northeast Agricultural University》 2015-03
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Effect of different nitrogen and potassium fertilizer applications on rice yield and lodging resistance

JIN Zhengxun;ZHENG Guanlong;ZHU Linan;SUN Lulu;ZHANG Zhongchen;LIU Haiying;XU Zhenhua;QU Ying;School of Agriculture, Northeast Agricultural University;  
Rice lodging usually occurs in the middle and the end of grain filling, and it is one of the major elements to affect high and stable yield and good quality. The experiment took Songjing9, a super kind of rice in cold region, as a sample to test the results of different usages of nitrogen and potassium fertilizer towards rice yield and its lodging resistance. The results showed that it was effective to increase the panicles and the grain weight per plant and the number of grains per ear when more nitrogen was used in the early stage of rice growth with the nitrogen application amount 90 kg· hm-2. And it was more effective when less nitrogen was used in the same stage with the amount 135 kg · hm-2. Internode length of the first and the second stems noticeably increased and the flexural strength of stem decreased when more nitrogen was applied in the early stage of rice growth. The influence would be more effective when the nitrogen amount adds up. However, it would be beneficial to strengthen the flexural strength of stems when more potassium and less nitrogen were used in the early planting stage. The nitrogen content of stems obviously increased when more nitrogen were used in the late stage of rice growth; the potassium content thus increased when nitrogen were applied in the early stage, which helped the rice to absorb and accumulate more potassium.The nitrogen content of stems was passively correlated to the internode length, and negatively to the flexural strength. On the contrary, the potassium content of stems was negatively and positively correlated to the internode length, and passively to the flexural strength.
【Fund】: 科技部“十二五”科技支撑计划项目(2011BAD16B11-02YJ02);; “十二五”农村领域国家科技支撑计划项目(2013BAD20B04-2S)
【CateGory Index】: S511
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