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Effects of root pruning on the vegetative growth and fruit quality of Zhanhuadongzao trees

机译：根系修剪对沾化冬枣树木营养生长和果实品质的影响

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摘要

The effects of root pruning on the vegetative growth and fruit quality of six-year-old Zhanhuadongzao (Ziziphus jujuba Mill.) trees were evaluated. Three root pruning treatments (severe, moderate and light degree) were conducted at the distance of 3,5and 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 to the control, both severe and moderate root pruning had no apparent effects on nitrogen, phosphorus and potassium contents 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, the contents of vitamin C and total sugar were increased but the content of cypermethrin was decreased in fruits and no effects were found on total acid content offruit and yield at harvest. In the rhizosphere soil, root pruning decreased the microbial populations and enzymes activities but increased the concentrations of cypermethrin, available nitrogen, phosphorus and potassium. It is proposed that the removalof root at 3 times trunk diameter distance from trunk was feasible to regulate the vegetative growth and fruit quality of Zhanhuadongzao tree.
机译：评估了根系修剪对六岁的詹华冬枣（Zipiphus jujuba Mill。）树的营养生长和果实品质的影响。在树木两行侧距树干直径的3.5、5和7倍的距离处分别进行了三种根部修剪处理（严重，中等和轻度）。结果表明，与没有根修剪的对照相比，严重的根修剪使主要分支的长度减少了27.9％，使主要分支的数量减少了12.1％。与对照相比，重度和中度根修剪对35天后的叶片氮，磷和钾含量无明显影响，但对161天后有显着影响。严重的根部修剪比中度修剪具有更大的控制营养生长的功效。通过根部修剪，果实中维生素C和总糖的含量增加，而氯氰菊酯的含量降低，并且对果实中的总酸含量和收获时的产量没有影响。在根际土壤中，根系修剪降低了微生物种群和酶活性，但增加了氯氰菊酯，有效氮，磷和钾的浓度。提出以3倍于树干直径的距离去根是可行的，以调节沾化冬枣的营养生长和果实品质。

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