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| Microbial fertilizer effects on soil nutrients and rice growth in barren paddy fields |
| Received:January 10, 2024 |
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| KeyWord:rice field;nitrogen fixing bacteria;phosphorus solubilizing bacteria;soil nutrient;enzyme activity |
| Author Name | Affiliation | E-mail | | XU Liyang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China | | | WANG Yanan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China | wangyanan@caas.cn | | ZENG Xibai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China | | | WEN Jiong | National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China
Yueyang Agricultural Research Academy, Yueyang 414000, China | | | YAN Yunhua | National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China
Yueyang Agricultural Research Academy, Yueyang 414000, China | | | ZHENG Zhong | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China | | | AHEGULI·Nuerbulati | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
National Agricultural Environment Observatory in Yueyang, Yueyang 414000, China | |
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| Abstract: |
| In order to investigate the effects of applying different microbial fertilizers on soil nutrients and rice growth in barren paddy soil in the middle and lower reaches of the Yangtze River, three different microbial combinations of Azotobacter chroococcum + Bacillus mucilaginosus（CM）, Azotobacter chroococcum + Bacillus subtilis + Bacillus amyloliquefaciens（ABP） and Bacillus subtilis + Bacillus amyloliquefaciens（SAT）were set up in pot experiment. And at the same time, the recommended dosage of microbial fertilizer and 1.2 times the recommended dosage of microbial fertilizers were set up, and then applied them together with the conventional dosage of chemical fertilizers, 15% nitrogen reduction and 15% nitrogen and phosphorus reduction to study the effects of different fertilization treatments on the basic physicochemical properties of the soil, the activity of soil enzymes and the growth of rice. The results showed that the addition of microbial fertilizer could effectively reduce soil pH and increase soil total nitrogen content. Soil available nitrogen, available phosphorus and ammonium nitrogen content showed a decreasing trend with the extension of the growth period, and vice versa for nitrate nitrogen. The combination and dosage of microbial fertilizer had a significant effect on soil available nutrients, in which ABP combination could improve available nitrogen, available phosphorus and ammonium nitrogen content of the soil during the whole growing period. The soil nutrient content of conventional fertilizer dosage and 1.2 times microbial fertilizer dosage treatment（1.2ABP + NPK）was lower than that of the recommended dosage treatment（ABP+NPK）, and the soil nutrient content was also decreased when chemical fertilizer dosage was reduced. All treatments with CM treatments had little effect on increasing available nitrogen and available phosphorus at the filling and harvest stages, while SAT treatments did not show obvious advantage in solubilizing phosphorus. Application of ABP increased soil acid phosphatase and catalase activities by 26.79% - 46.27% and 7.85% - 15.81%, respectively, which was better than that of CM and SAT combinations. SAT could promote stem and leaf growth to a certain extent but was not effective in promoting root growth and increasing yields, and there was no significant change in plant height and dry weight of roots with the addition of CM compared with treatment of chemical fertilizer alone（NPK）, whereas the ABP combination had a significant advantage in promoting root elongation and plant growth and increasing production, in which the rice yield of ABP+NPK treatment was 1.25 times higher than that of the control treatment. This study shows that the application of nitrogen-fixing and phosphorus-solubilizing microbial fertilizers can significantly increase the nitrogen and phosphorus nutrient effectiveness of the soil, improve the enzyme activity of the soil, and promote the growth and enhance the yield of rice in barren paddy soil. |
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