Abstract: Thegrouting characteristics of two hybrid maize varieties, Xinzhongyu 801 and Jingnongke 728, were studied by split plot design. The results showed that Xinzhongyu 801 was a big ear type variety with sparse planting, and Jingnongke 728 was a dense-tolerant type variety, through the analysis of the fresh weight of singlespike. The analysis of 100-grain fresh weight and dry weight showed that the grain size of maize was related to the heredity of varieties, but not influenced by planting density. Through the analysis of grain water content, it was found that the grain water content decreased gradually during the whole filling process. Through the analysis of the grain filling rate, it was found that the grain filling rateof Xinzhongyu 801 was also affected by planting density, but the grain filling rateof Jingnongke 728 was less affected by planting density. The fresh weight, dry weight and water content of 100-grain were related to the heredity of the variety, and were not affected by the planting density.

Key words: maize, planting density, Xinzhongyu 801, Jingnongke 728, grouting characteristics