巨峰葡萄晚秋叶施^15N—尿素的吸收,运转,贮藏和再分配

Effect of Autumn Foliar Application of ~(15)N-Urea on Absorption, Translocation, Storage and Redistribution of Fertilizer N in o' Grapevine

Three-year-old Kyoho grapevines ( Vitis vinifera ? V.labrusca) were used in this experiment. The results indicated that fertilizer utilization rate in Kyoho grapevine with foliar spray of ~(15)N-urea in Autumn was 26.09%.It needed 12~24 hours for fertilizer N, after absorbing by leaves, to translocate to fine roots. Fertilizer N was partly transformed into protein as soon as it reached the fine roots.Total N and fertilizer N were mainly stored in roots, especially in large roots of Kyoho grapevine in dormant season, and most of them existed in form of non-protein. Arginine was the dominant free amino acid in fine roots in dormant season.More proportion of fertilizer was used for leaf and fruit growth than that of total N after the grapevine sprouting in Spring of the next year. Compared to the control, all of the treatments had effects on promoting total N and fertilizer N to redistribute to the clusters and leaves opposite the clusters, increasing dry weight of the berries, and enhancing fruit-setting ratio, among which heavy pinching treatment had the most significant effect.