Abstract: In order to understand the spatial variation characteristics of leaf light response during the grain-filling stage of summer maize in North China, taking summer maize in North China as the research object, the light response curves of different leaf positions and different parts of the leaf during the grain filling period of summer maize were observed through field experiments. The results showed that there were significant differences in the response of photosynthetic characteristics to photosynthetically active radiation in different leaf positions and different parts of leaves during the grain filling stage of summer maize, and the photosynthetic parameters obtained by the light response model were significantly different in the spatial distribution of plants. The research results can provide reference for improving the growth and development environment of summer maize during grain-filling period in North China.

Key words: summer maize, pustulation period, photoresponse, different leaf positions, different parts of leaves