Abstract: In this study,different N application timing and levels were applied for understanding the effects on maize canopy structure and photosynthesis traits. The results showed that:canopy structure indexes (leaf angle above ear layer LOV,and LAI,etc.),photosynthesis capability indexes (Pn) of ear layer could be used as standards for the evaluation of high yielding canopy structure. The nitrogen application affected those indexes. When nitrogen fertilizer application rate was 180 kg /ha,it should be applied before sowing as basal fertilizer,by which leaf angle ahove the ear was smaller LAI in the prophase increased faster while reduced slower after Bilking stage,and LOV and Pn were larger in the Bilking stage. When the nitrogen fertilizer rate was 75 kg/ha}8}eaf stage was suitable for achieving good canopy structure. Under N amount of 75 kg/ha} leaf angle above the ear was smaller while LOV was larger and LAI was ideal,and thus Pn was high,therefore this canopy structure was highly efficient.

Key words: Summer Maize, Canopy structure, Leaf oriented value(Lov), Photosynthesis

CLC Number: 

• S143.1