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Effect of Different Intercropping Types on the Growth of Replanted Apple Tree and Soil Environment
MA ZiQing, DUAN YaNan, SHEN Xiang, CHEN XueSen, YIN ChengMiao, MAO ZhiQuan
Scientia Agricultura Sinica
2018, 51 (19):
3815-3822.
DOI: 10.3864/j.issn.0578-1752.2018.19.018
【Objective】Taking the soil of the old apple orchard as the object, this study is to explore the effects of mixed planting of different crops and replanted young apple trees on replanting plants and soil environment, select the more effective mixed plant to reduce the apple replant disease, and to provide technical support for the renewal of old orchards.【Method】The experiment included 5 treatments, which were CK (the old apple orchard soil), T1 (the methyl bromide fumigation old apple orchard soil), T2 (grafted apple seedlings mixed with Allium fistulosum), T3 (grafted apple seedlings mixed with Triticum aestivum), T4 (grafted apple seedlings mixed with Brassica juncea). the effect of mixed planting of different crops on the aboveground biomass, soil enzymes activity, soil microbial quantity, and soil phenolic acid content was detected. The copy number of the major harmful fungi in soil of old orchard was detected by real-time quantitative PCR technology.【Result】Mixed the three kinds of crops and young apple tree obviously enhanced the young apple tree plant height, ground diameter, fresh weight, dry weight, average fresh shoot length, and total fresh shoot length, and the treatment of mixed planting with A. fistulosum (T2) had the most beneficial effect, which plant height, ground diameter, fresh weight, dry weight, average fresh shoot length, and total fresh shoot length were 1.12, 1.31, 1.71, 1.65, 1.25 and 2.09 times of the control, respectively. mixed planting three crops could increase the number of soil bacteria and reduce the number of soil fungi. Compared with the control, the number of soil bacteria increased by 37.93%, and the number of soil fungi reduced by 41.33% under the treatment of mixed planting with A. fistulosum, the number of soilbacteria increased by 31.03% under the treatment of mixed T. aestivum, the number of soil bacteriaincreased by 13.79% under the treatment of mixed B. juncea. The ratio of bacteria to fungus in the soil increased by 135.11%, 128.55% and 89.66% when mixed A. fistulosum, T. aestivum, B. juncea, respectively. Compared with the control, the gene copy number of Fusarium genus in the mixed three kinds of crops decreased, and showed significant differences. The gene copy number of F. moniliforme, F. oxysporum, f. solani and F. proliferatum declined by 61.01%, 37.11%, 40.97% and 53.11% under the treatment of mixed planting with A. fistulosum, respectively. Mixed the three kinds of crops and young apple tree could increase the activity of main soil enzymes, among which the mixed planting of B. juncea had the obvious promotion effect of urease activity compared with the control, which increased by 44.59%. the mixed planting of T. aestivum increased the activity of phosphatase and sucrose by 59.26% and 50.37%, respectively. The content of phlorzin in mixed planting A. fistulosum, T. aestivumcrops and B. juncea soil decreased by 81.23%, 20.56% and 86.11%, respectively, the total amount of phenolic acid in the soil of the mixed planting of A. fistulosum decreased by 28.27% compared with the control, and the effect was better than other treatments.【Conclusion】Mixed planting of A. fistulosum, T. aestivum and B. juncea has great influence on soil environment and biomass of replanted young trees. All of the three mixed crops can promote the growth of replanted young trees, optimize the structure of microbial community and increase the activity of main enzymes in replanted soil, decrease the content of phlorzin in soil, and reduce the apple replant disease. Among them, the effect of mixed with A. fistulosum is the best.
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