Effects of Nitrogen Application on Yield and Photosynthetic Characteristics of Double Cropping Late Rice

doi:10.7668/hbnxb.2018.03.032

Abstract

Abstract: To be explicit about Hunan double cropping "early storage late irrigation" water saving light and simple cultivation conditions suitable for rice production of nitrogen application pattern,the "early storage late irrigation" effects of 7 different nitrogen ratio models of water saving light and simple cultivation conditions on photosynthetic characteristics and yield of late rice were analyzed. The results showed that the maximum of Yuzhenxiang was showed in the nitrogen application ratio of tillering stage:booting stage:heading stage as 4:3:3 with 7 930 kg/ha,higher 3.12%-15.94% than nitrogen treatment,higher 44.44% than without nitrogen treatment;Fengyuanyou 299 in the nitrogen application ratio of tillering stage:booting stage:heading stage as 5:3:2 with record of 7 980 kg/ha,compared with high nitrogen 2.57%-9.47%,compared with the treatment without nitrogen application 40.74%. Different nitrogen ratio on net photosynthetic rate of rice decreased gradually in the growth period and the trend of reducing the tillering stage to the booting stage was the biggest,Yuzhenxiang decreased to 29.92%-45.38%,Fengyuanyou 299 decreased to 28.62%-36.51%;and from booting stage to milk stage to reduce the amplitude of Yuzhenxiang 5.01%-17.47% and Fengyuanyou 299 1.28%-13.28%.Yuzhenxiang showed a net of light of different treatments on rice photosynthesis had their own characteristics in each growth period,Fengyuanyou 299 at early stage in the treatment of A(one-time application of compound fertilizer as basic fertilizer) highest. The best treatment of E(tillering stage:booting stage:heading stage=4:3:3)at booting stage-milk ripening period. The rate of transpiration increased with the proportion of nitrogen transfer Yuzhenxiang and Fengyuanyou 299 in the growth stage of rice had gradually decreased in the main growth period of rice,two varieties without nitrogen fertilizer,booting,heading and milk ripening stage were dealt with C(tillering stage:booting stage:heading stage=6:3:1)optimum fertilization ratio. Therefore,the reasonable ratio of nitrogen application can effectively improve the photosynthetic utilization and improve the efficiency of rice production.

Key words: Double cropping late rice, Nitrogen application, Yield, Photosynthetic characteristics

CLC Number:

SU Shan, FU Zhiqiang, LONG Wenfei, LI Hailin. Effects of Nitrogen Application on Yield and Photosynthetic Characteristics of Double Cropping Late Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(3): 218-223. doi: 10.7668/hbnxb.2018.03.032.

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