关键词: 玉竹, 玉竹, 根际土壤, 化感物质, 连作障碍, 气相色谱-质谱联用技术

Abstract: The aim is to screen the suitable mechanical harvest maize varieties in the spring maize planting zone of Shanxi Province. 30 new maize varieties were collected in this experiment. The random block arrangement, interval contrast design and the whole mechanical management were used in this study, and the differences of agronomic traits and yield were compared. The results showed that only variety‘Heyu 301’ could meet the approval criteria for mechanical harvest maize, with a growth period of 118 days, 17.2% grain moisture content at harvesting, and the yield increased by 5.7% compared with the control. The other varieties did not meet the ideal requirements of mechanical harvest. The yield of maize was closely related to the growth period and grain moisture content. How to balance the relationship between grain performance and the growth period, grain moisture content as well as yield and breed the suitable mechanical harvest maize varieties still need more researches in the following years. The breeding and screening of suitable mechanical harvest maize varieties should focus on moderate growth period, quick dehydration and lodging resistance, on the basis of ensuring yield.