| Effects of rhamnolipid modified biochar on resistance and nitrogen absorption of Chinese cabbage in saline soil |
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| DOI：10.7606/j.issn.1000-7601.2022.05.09 |
| Key Words: rhamnolipid modified biochar saline soil Chinese cabbage stress resistance nitrogen absorption |
| Author Name | Affiliation | | WANG Minge | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | LIU Yiwen | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | ZHANG Dandan | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | XU Junze | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | GOU Cong | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | GU Yiming | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China | | WANG Xudong | College of Natural Resources and Environment, Northwest A＆F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and the Agro\|environment in Northwest China,Ministry of Agriculture, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To explore the effects of rhamnolipid modified biochar on saline soil, a pot experiment of Chinese cabbage was set up. Four different treatments of rhamnolipid modified biochar (rhamnolipid volume (V) with concentration of 250 mg·L-1 accounts for 15%, 10%, 5% and 0%) were added to saline soil according to the proportion of 1% and 2% to soil mass. The effects of rhamnolipid modified biochar on the properties of saline soil, nitrogen nutrient absorption, growth and enzyme activity of Chinese cabbage were studied. The results showed that compared with the control, rhamnolipid modified biochar increased the content of soil organic carbon, ammonium nitrogen and nitrate nitrogen, but had no significant effect on soil pH. Among them, the content of organic carbon in the treatment with rhamnolipid modified biochar was significantly increased by 55.05%~142.67% compared with the control, and the content of ammonium nitrogen in the treatment with rhamnolipid modified biochar of 10% was significantly increased by 156.69% compared with the control. Compared with the control, the content of nitrate nitrogen increased significantly by 37.94% and 41.46% in the treatment with 15% and 10% of rhamnolipid modified biochar. The biomass and nitrogen uptake of Chinese cabbage were significantly increased. The treatment with 10% modified ratio increased by 47.13% and 43.64% respectively compared with the treatment with biochar alone. The activity of glutamine synthetase and peroxidase in leaves were increased, the content of soluble protein was increased, and the content of malondialdehyde was reduced. The best effect was from the 10% modification ratio since the treatment significantly increased the activities of glutamine synthetase and peroxidase by 113.64% and 30.87% respectively compared with the control, and the soluble protein content of 10% and 5% treatment was increased by 7.59% and 37.60% respectively. The malondialdehyde content for the 10% treatment with rhamnolipid modified biochar was significantly reduced by 80.60% compared with the control. In general, the biochar modified by rhamnolipid improved the resistance of Chinese cabbage in saline soil and promoted its absorption of nitrogen, and the modified ratio of 10% was the best. |
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