玉米是吉林省主要农作物,在杂种优势利用中,每年都需生产大量的自交系和杂交种种子。在玉米种子生产过程中,确定既能保证种子质量又可获得较高产量的适宜收获期,具有较大的实际意义。本试验的目的是研究不同收获期对玉米种子质量的影响,为确定玉米种子的适宜收获期提供依据。材料和方法试验于1987、1988年在吉林农大教学实验场进行。供试材料为吉823自交系和四单8杂交种,于1987年的4月30日和1988年的5月2日人工播种。田间管理按正常管理措施进行。授粉后25～60天在同一地块随机取样,每隔5天收一批,每批收10个果穗,共收8批。收后立即扒皮,从每个果穗上随机取一行,混合后烘干,测定种子含水量,然后 Maize is a major crop in Jilin Province. In the utilization of heterosis, large quantities of inbred and hybrid seeds are required to be produced each year. In the process of corn seed production, it is of great practical significance to determine the suitable harvest period which can ensure both the seed quality and the higher yield. The purpose of this experiment is to study the effect of different harvest time on the quality of maize seeds and provide the basis for determining the suitable harvest time of maize seeds. Materials and methods test in 1987, 1988 in Jilin Agricultural University Experimental Field. The tested materials were Ji 823 inbred and four single 8 hybrids, and sown manually on April 30, 1987 and May 2, 1988. Field management according to normal management measures. After pollination 25 to 60 days in the same block random sampling, received a batch every 5 days, each ear received 10 ear, received a total of 8 batches. Immediately after harvesting flatter skin, randomly selected from each ear row, mixed and dried to determine the seed moisture content, and then