Effects of Reduced Nitrogen Fertilizer Application on Photosynthesis Characteristics and Carbon Metabolism of Maize after Anthesis under Shallow Buried Drip Irrigation with Water and Fertilizer Integration
The effects of reduced nitrogen fertilizer application on photosynthetic characteristics and carbon metabolism of maize after flowering were studied in the West Liaohe Plain during 2019-2020.The results showed that the photosynthetic characteristics of CK during the grain-filling stage were significantly higher than those of N2,but the difference from N1 was not significant.The photosynthetic production capacity of the post-flower popu-lation was not significantly different between CK and N 1,but both were significantly higher than N2.The activity of carbon-metabolizing enzyme CK and N1 after flowering was not significantly different,but both were significantly higher than N2.The dry matter accumulation,stem sheath and leaf grain contribution rate were not significantly dif-ferent,but the difference between CK and N1 was significantly higher than that of N2.Over the two-year period,N1 and N2 production decreased by 3.76％,14.88％,3.11％and 11.47％respectively compared to CK.Under the inte-gration of shallow burial drip irrigation and fertilizer,the photosynthetic characteristics,group photosynthetic pro-duction capacity and carbon metabolism enzyme activity of maize after 30％reduction of conventional nitrogen top-dressing in the West Liaohe Plain were high,which could provide a theoretical reference for the efficient manage-ment of maize yield and nitrogen resources in the region.
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