关键词: 春小麦, 春小麦, 产量, 氮肥利用率, 氮平衡

Abstract: In this experiment, with the 2-year-old red globle grape under open field cultivation as test material, tree distribution of photosynthetic products of 14C was studied by feeding on the fruiting branches in different sections of bits of leaves and girdling treatment. The results showed that the relative position of leaf effects the transportation and distribution of assimilates to the fruits. The ipsilateral ear leaf is the main assimilation source of fruit with coloring phase, while the opposite side especially the upper ear leaf is the main assimilation source of dendrite below and the distribution rate is related to organ weight. Girdling treatment eliminated the effects made by the relative position of leaves on the distribution of photosynthetic products to fruit and other organs.