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| Effects of Anaerobically Digested Slurry on Phytophthora capsici and Soil Physic-chemical and Microbial Properties |
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| KeyWord:anaerobically digested slurry; soil disinfection; ammonium; Phytophthora capsici |
| Author Name | Affiliation | | CAO Yun | Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | CHANG Zhi-zhou | Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | MA Yan | Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | LI Cai-feng | College of Life Science, Nanjing Normal University, Nanjing 210023 | | HUANG Fei | College of Life Science, Nanjing Normal University, Nanjing 210023 |
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| Abstract: |
| Soilborne diseases caused by various phytopathogens have been a bottleneck in intensive production of chilli peppers. We investigated the effects of anaerobically digested slurry（ADS, 472 mg·L-1 NH+4-N） and NH+4-intensified ADS（1000 mg·L-1 NH+4-N） on the growth of Phytophthora capsici, the culprit of Phytophthora blight of chilli pepper, and physic-chemical and microbial properties in three different soils using water as control（CK）. Compared to the original soils, water flooding or ADS application resulted in higher ammonium levels but lower nitrate levels in the soils. Applying ADS also significantly increased concentrations of water soluble carbon and water soluble nitrogen in the soils in comparison with water control. Flooding with water or ADS decreased soil bacterial and fungal populations, but had no significant impact on actinomycetic population. Of three treatments, the NH+4-intensified ADS treatment had the highest number of soil bacterial community, while no significant differences were found in fungal and actinomycetic communities. Activities of soil dehydrogenase and urease reached peak on day 2 to 4 and decreased thereafter. Flooding treatments decreased the population of P. capsici in the soils by 10 to 1000 folds. The least number of P. capsici was observed in soil treated by NH+4-intensified ADS. The pathogen population decreased greater in alkali soil than in other soils. The results show that ADS with ammonium could enhance soil′s capability and stability to suppress P. capsici. |
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