Effects of Different Nitrogen Levels on Photosynthetic Performance, Nitrogen Accumulation and Translocation of Barley

doi:10.7668/hbnxb.20190653

Abstract

Abstract: In order to explore the effect of nitrogen levels on barley photosynthetic performance and nitrogen fertilizer utilization efficiency,and to study the mechanism of efficient formation of barley nitrogen,two varieties of Mengpi 3 and Kenpi 7 were used as test materials,with 0,90,180,270 kg/ha pure nitrogen and four nitrogen fertilizer treatments were used to analyze the differences and correlations of photosynthetic performance,nitrogen accumulation and translocation after anthesis,and nitrogen fertilizer utilization efficiency of different nitrogen efficiency barley leaves at different nitrogen application levels.The results showed that with the increase of nitrogen application rate,the accumulation rates of Chl,Pn,Gs,Tr,Fo,Fm,Fv/Fm,qP and post-anthesis nitrogen of the two varieties of barley increased first and then decreased.The trend of lowering height reached the peak when the nitrogen application rate was 180 kg/ha,and the nitrogen transport rate of leaves and stems and its contribution rate to grain,nitrogen production efficiency and nitrogen fertilizer physiological efficiency decreased first and then increased.The trend was that the agronomic efficiency of nitrogen fertilizer and the partial productivity of nitrogen fertilizer were decreasing.Compared with the varieties,Chl,Pn,Gs,Tr,Fo,Fm,Fv/Fm,qP,the contribution rate of leaf and stem nitrogen transport to grain,NAG,PFP and yield of Mengpi 3 were higher than those of Kenpi 7.On the Kenpi 7,and the difference mostly reached a significant level.The rate of nitrogen accumulation after flowering and its contribution to grain were all higher than that of Mengpi 3 and most of them were significantly different.There was no significant difference in nitrogen transport rate,NGPE and NPE between leaves and stems.Correlation analysis showed that there was a significant positive correlation between yield and various photosynthetic performance indicators. The nitrogen accumulation rate after anthesis and its contribution rate to grain were positively correlated with various photosynthetic performance indexes.Except for the negative nitrogen-transport rate of leaf and the negative correlation between Fv/Fm,the nitrogen transport rate of leaves and stems and other items.The photosynthesis performance index showed a significant negative correlation;the contribution rate of leaf nitrogen transport to grain was significantly negatively correlated with Gs and Fo,and the others were negatively correlated.The contribution rate of stem nitrogen transport to grain was Chl,Pn,Fv/Fm and qP were positively correlated,and negatively correlated with Gs,Tr,Fo and Fm.NGPE was negatively correlated with Fv/Fm,and negatively correlated with Chl,Pn and qP,and other photosynthetic performance indicators.There was a significant negative correlation;NAE was positively correlated with Chl,Gs,Fv/Fm, and negatively correlated with other photosynthetic performance indicators;PFP was positively correlated with Fv/Fm and negatively correlated with other photosynthetic performance indicators;NPE and Chl,Pn,Fv/Fm showed a significant negative correlation and was significantly negatively correlated with other photosynthetic performance indicators. After comprehensive analysis,it was concluded that the appropriate amount of nitrogen fertilizer application would help barley growth and production,but excessive nitrogen application would play a role in inhibition.Mengpi 3 had a strong responsiveness to nitrogen fertilizer and strong photosynthetic performance.The transferred nitrogen had a high contribution rate to the grain and the nitrogen fertilizer utilization efficiency was relatively high.

Key words: Spring barley, Photosynthetic performance, Nitrogen accumulation, Nitrogen use efficiency, Related analysis

CLC Number:

S143.1

DE Muqige, LIU Zhiping, WANG Lei, WANG Jinbo, QI Haixiang, GUO Chengyu, Lü Ersuo, BA Tu, XU Shoujun. Effects of Different Nitrogen Levels on Photosynthetic Performance, Nitrogen Accumulation and Translocation of Barley[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(3): 126-135. doi: 10.7668/hbnxb.20190653.

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