每亩穗数、每穗粒数和粒重是构成玉米产量的三个因素,三者具有相互制约的关系。一般认为,在构成玉米产量的三个因素中,穗数和每穗粒数是较活跃的因素,二者构成单位面积的粒数。因此,有必要了解玉米籽粒数量在不同生态条件下的变化规律。本项研究探讨了玉米籽粒数量的变化规律及其与产量之间的关系,提出了进一步提高产量的可能途径。一、材料与方法试验于1984年在沈阳农业大学校内试验基地进行,试材为沈单3号。试验设密度处理、施肥处理和阶段干旱处理。其中种肥为500公斤, The number of spikes per acre, the number of grains per spike and grain weight are the three factors that make up the corn production, and the three have a mutually restrictive relationship. It is generally believed that among the three factors that make up corn yield, the number of spikes and the number of grains per spike are more active factors, both of which constitute the number of grains per unit area. Therefore, it is necessary to understand the variation of maize grain under different ecological conditions. This study explored the changing rules of corn grain quantity and its relationship with yield, and put forward the possible ways to further increase the yield. First, the material and method test in 1984 in Shenyang Agricultural University Experimental Base, the test material Shen No. 3. Test set density treatment, fertilization and stage drought treatment. Which kind of fertilizer is 500 kilograms,