Effects of root pruning on the vegetative growth and fruit quality of Zhanhuadongzao trees
2010
Yang, S.,Shandong Forestry Academy, Jinan (China) | Xing, S.,Shandong Forestry Academy, Jinan (China) | Liu, C.,Shandong Agricultural Univ., Tai'an (China). Coll. of Resources and Environment | Du, Z.,Shandong Forestry Academy, Jinan (China) | Wang, H.,Binzhou Forestry Bureau, Shandong (China) | Xu, Y.,Binzhou Forestry Bureau, Shandong (China)
The effects of root pruning on the vegetative growth and fruit quality of six-year-old Ziziphus jujube trees were evaluated. Three root pruning treatments (severe, moderate and light) were conducted at the distance of 3, 5 and 7 times trunk diameter from trunk on both inter-row sides of the trees, respectively. The results showed that the severe root pruning decreased the length of primary branch by 27.9% and the number of primary branches by 12.1% in contrast to the control of no root pruning. Compared with the control, both severe and moderate root pruning had no apparent effects on N, P and K concentrations of leaves after 35 days, but had significant effects after 161 days. Severe root pruning had larger effectiveness of controlling vegetative growth than the moderate one. By root pruning, vitamin C and total sugar concentrations were increased but the level of cypermethrin was decreased in fruits and no effects were found on total acid concentration of fruit and yield at harvest. In the rhizosphere soil, root pruning decreased the microbial populations and enzymes activities but increased the concentrations of cypermethrin, available N, P and K. The removal of root at 3 times trunk diameter distance from trunk was efficient to regulate the vegetative growth and fruit quality of Zhanhuadongzao tree.
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