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通过对三个常规小麦陕１６０、陕２２９、西农１３７６和三个杂种小麦９５Ｆ１０、９５Ｆ９３０２、９５Ｆ９３０３在７５万·ｈｍ－２～２２５万·ｈｍ２三个密度水平的裂区试验，研究了密度对不同小麦产量的影响以及绿叶面积和光合产物的动态变化规律。结果表明，密度对产量的效应大于品种对产量的效应，杂种小麦产量水平较高，绿叶面积较大，叶功能期较长是杂种小麦高产的重要生理基础；杂种小麦与常规小麦在干物质分配率方面比较，灌浆前期，常规小麦西农１３７６在籽粒中的分配率大于杂种小麦，但在灌浆后二者差异不大。
The density of three conventional wheat Shaan 160, Shaan 229, Xinong 1376 and three hybrid wheat 95F10, 95F9302 and 95F9303 were studied in the split zone test at three densities ranging from 750,000 hm -2 to 22500 hm 2. The effects of different wheat yields and the dynamic changes of green leaf area and photosynthate. The results showed that the effect of density on yield was greater than the effect of variety on yield. The yield of hybrid wheat was higher, the area of green leaf was larger and the leaf function period was longer, which was the important physiological basis for high yield of hybrid wheat. In terms of rate, the allocation rate of conventional wheat “Xinong 1376” was higher than that of hybrid wheat in the early filling stage, but the difference was not obvious after grouting.