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《China Rice》 2016-01
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Effects of the Combined Application of Silicon and Nitrogen Fertilizer on Photosynthetic,Chlorophyll fluorescence and Yield of Rice

WANG Benfu;HUANG Jinpeng;ZHAO Feng;CHEN Shaoyu;LI Yang;Key Lab of Huazhong Crop Production, Physiology and Ecology of Ministry of Agriculture , Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement;  
In order to investigate regulating effects of combined application of nitrogen and silicon fertilizer on photosynthesis and chlorophyll fluorescence parameters, and intrinsic physiological basis about silicon-nitrogen fertilizer regulation of photosynthesis in rice, using super rice Guangliangyou 476 as material, two nitrogen levels and three levels of silicon fertilizer in field experiment were applied. The results showed that increasing nitrogen and silicon can improve rice leaf chlorophyll content, photosynthesis under low nitrogen high silicon levels and higher nitrogen middle silicon levels processing strongest, appropriate nitrogen fertilization in favor of reduced non-radiative energy dissipation of rice, will absorb more light energy for photochemical reaction. Increasing silicon fertilizer can effectively improve the chlorophyll fluorescence parameters of indicators and the performance photosynthesis of rice leaf under low nitrogen levels, but under high nitrogen conditions, along with the amount of silicon increased the initial fluorescence(F0), non-photochemical quenching coefficient(NPQ)were increased after the first cut, and PSⅡ potential activity(Fv/F0), the actual photochemical efficiency(ΦPSⅡ)were increased and then decreased. This showed that silicon overdose photochemical efficiency will lead to a decline. Effects of silicon-nitrogen interaction were significantly on rice photosynthetic indexes, silicon fertilizer can effectively im-prove the performance of rice leaf photosynthesis under low nitrogen levels, and the appropriate amount of silicon is 37.5 kg/hm2 under high nitrogen levels, then the light use efficiency is highest, and conducive to the formation and accumulation of photosynthetic products for high-yield cultivation.
【Fund】: 湖北省农业科学院青年基金(2013NKYJJ01)
【CateGory Index】: S511
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