[Effect of light from flowering to maturity stage on dry matter accumulation and nutrient absorption of summer maize]

Using Denghai 605 (DH4605) as the experimental material, shading (S) and increasing light (L) treatments from flowering to maturity stage were designed in a field experiment to explore effects of light on dry matter accumulation and nutrient absorption of summer maize. Results showed that grain yield, dry matter accumulation and nutrient absorption decreased significantly after shading but increased after increasing light. Yields in S treatment from 2011 to 2013 were reduced by 59.4%, 79.0% and 60.6% compared to those in CK, while that in L treatment were increased by 16.3%, 12.9% and 6.8%, respectively. The relative N and P absorption increased to a certain extent because of the greater effect of shading on dry matter accumulation than that of N and P absorption. After shading, K absorption of whole plant corn decreased significantly to a greater extent than that of dry matter accumulation decrease. The proportion of nutrient allocated to grains decreased significantly after shading. Dry matter accumulation and N and P absorption rates increased significantly after increasing light, and effects of increasing light on N and P absorption were greater than that of dry matter accumulation. Nutrient accumulation and the proportion allocated to grain increased significantly after increasing light.