| Effects of soil layer exchange on rhizosphere soil enzyme activities and late blight disease index in potato |
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| DOI：10.7606/j.issn.1000-7601.2016.06.26 |
| Key Words: soil layer exchange potato phosphate fertilizer organic fertilizer soil enzyme activity late blight disease index |
| Author Name | Affiliation | | ZHANG Hong-lei | Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Land Reclamation Bureau of Heilongjiang Province, Nengjiang, Heilongjiang 161441, China | | ZHANG Ding | Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | WANG Qiu-ju | Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150090, China | | LIU Feng | Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150090, China | | GAO Zhong-chao | Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150090, China | | JIAO Feng | Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | ZHAI Rui-chang | Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Compared with the conventional fertilization without soil layer exchange, the effects of different treatments, including 0～20 cm and 20～40 cm soil exchange, soil exchange with 15% phosphate or organic fertilizer application, and soil sterilization by 25% carbendazim wet powder, on the soil enzyme activity and the disease index of potato late blight in different soil layers(0～10 cm, 10～20 cm, 20～30 cm, 30～40 cm) were studied in this paper. Results showed that the activity of soil urease, invertase and phosphatase in rhizosphere was affected by the soil layer exchange, soil exchange with 15% phosphate or organic fertilizer, and soil sterilization. At 35 days after sowing, the soil layer exchange and sterilization treatment decreased the urease activity in 0～10 cm soil layer. The soil invertase activity in each soil layer was significantly increased by soil layer exchange with 15% organic fertilizer. Soil exchange with phosphate or organic fertilizer application could maintain the phosphatase activity in the rhizosphere, and the effect of applying phosphorus fertilizer was more obvious. Moreover, soil exchange with phosphate application and soil sterilization reduced the incidence of potato late blight. At 77 days after sowing, the disease index for soil exchange with organic fertilizer was increased by 17.5%, 47.1%, 60.8%, and 66.6%, compared with CK, soil exchange, soil exchange with 15% phosphate, and soil sterilization, respectively, suggesting that application of organic fertilizer after soil exchange was not helpful to reduce the incidence of potato late blight. |
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