Two-year-old split-root potted apple trees （Royal Gala） were used for studying the effects of partial rootzone alternative irrigation on the content of endogenous hormones in leaves and growth of shoots and leaves. There are five experiment groups of irrigation： complete irrigated part, 3/4, 2/4, 1/4 and no irrigation part. The results showed that the content of ABA in leaves increased but contents of IAA, GA3 and ZR in leaves were decreased, the growth of shoots and leaves were markedly inhibited under the treatments of 1/4 and 2/4 irrigation groups. We supposed the reasons for the growth of shoots and leaves inhibited markedly were the common effects of ABA increasing, CTK decreasing in roots synthesizing and IAA and GA3 slowing down in shoots and young leaves synthesizing.
Acta Horticulturae Sinica
Partial rootzone irrigation
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