Effects of Thermal-Disturbed Vermicompost on Soil Quality and Crop Growth
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Supported by the National Key Research and Development Program of China (No. 2016YFD0200305) and the National Natural Science Foundation of China (Nos. 41771287 and 41671255) and the Central University Business Fees (No. KYYJ201702)

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    Abstract:

    【Objective】This study is oriented to explore effects of thermal-disturbed vermicompost on soil quality and crop growth in expectation that all the findings may help guide large-scale processing and application of the manure and promote high-efficient recycling and utilization of organic waste. 【Method】 Fresh vermicompost was placed into an incubator for 20 hrs of incubation under a set temperature (30, 40, 50, 60, and 70 °C) separately, The incubated vermicomposts were sampled for analysis of changes in basic property, and then packed into pots separately for pot experiment in a well-lit greenhouse to explore effects of the incubated vermicompost on soil properties and tomato growth.【Result】Results show that with the temperature in incubation rising from 30 ℃ to 70 ℃, pH, and the contents of dissolved organic carbon and ammonium in the vermicompost increased and reached the highest at 70 ℃, but the content of nitrate and available potassium declined and the activities of the enzymes involved in carbon and nitrogen recycling did, too, while microbial biomass carbon and nitrogen increased first (at 40 ℃) and then declined (at 70 ℃). Microcosm study shows that compared to CK (vermicompost incubated at room temperature (30 ℃), the vermicomposts incubated at higher temperatures significantly increased shoot and root biomasses of the tomato in the pot experiment by about 200% and 56% ~ 115%, respectively. With incubation temperature rising, the plant uptake of NPK increased steadily. NKP supply (the sum of soil available nutrients and effective nutrient uptake of the plant) of the vermicompost increased first and declining with the incubation temperature rising, and was the highest in Treatment 50 (where the vermicompost was incubated under 50 ℃). Soil pH and dissolved organic carbon in the vermicompost increased gradually with rising incubation temperature. Soil microbial biomass carbon and nitrogen increased first and then declined and was the lowest in Treatment 70. Activities of the soil enzymes involved in carbon and nitrogen recycling varied from treatment to treatment, but on the whole did exhibit a rising trend.【Conclusion】To sum up, thermal disturbance may cause vermicompost to decline in bio-activity, but increase in nutrient availability. So application of thermal disturbed vermicompost can significantly promote plant uptake of NPK. Obviously thermal disturbance may help vermicompost bring its nutrient availability into full play. It is, therefore, concluded that thermal disturbance of vermicompost is beneficial to building up of soil fertility in a short term and to plant growth as well. However, future studies should shift their focus on long-term effect of the application of thermal-disturbed vermicompost on larger spatial and temporal scales.

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ZHOU Xing, CHEN Cheng, CHANG Haina, WANG Dongsheng, ZHENG Yong, JIAO Jiaguo, HU Feng, LIU Manqiang. Effects of Thermal-Disturbed Vermicompost on Soil Quality and Crop Growth[J]. Acta Pedologica Sinica,2020,57(1):142-152.

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History
  • Received:November 19,2018
  • Revised:May 10,2019
  • Adopted:June 03,2019
  • Online: August 27,2019
  • Published: