Effect of Root Pruning and Fertilization on the Twice Branch Growth, Fruit Output and Quality of Zizyphus jujube Mill.

doi:10.11924/j.issn.1000-6850.2012-2256

Abstract

Abstract: In order to estimate the effect of root cutting and fertilization on the growth, fruit output and quality of Zizyphus jujube Mill, the root system of 6-year-old Zizyphus jujube Mill. trees was manually cut with a sharp spade at 3 times trunk diameter distance along both inter-row sides prior to buds break in Binzhou Chinese jujube orchards. Effect of root pruning and fertilization on the twice branch growth, fruit output and quality of Zizyphus jujube Mill. was studied. The results showed that half amount of fertilization in germination stage decreased the growth of twice branch. However, there was no great influence of half amount of fertilization after fruit setting. Reduction of fertilizer decreased the fruit output of Zizyphus jujube Mill. Under the same fertilization conditions, the root cutting of 3 times trunk diameter decreased the growth of twice branch, which was equal to half amount of fertilization. Besides, after root pruning, reduction of fertilizer increased the inhibition effects of growth of Zizyphus jujube Mill. Additionally, under the same fertilization conditions, the fruit output of Zizyphus jujube Mill. was significantly increased, compared with their respective un-root-pruning control. The yield-increasing effect of was equal to half amount of fertilization. Moreover, reduction of fertilizer after root pruning could increase the annual fertilizer utilization efficiency. The contents of Vc and water-soluble sugar in the fruits of Zizyphus jujube Mill. were increased by root cutting, significantly. As a result, 3 times trunk diameter distance root cutting combination with the reduction of fertilizer was beneficial to the fruit output and quality of Zizyphus jujube Mill.

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