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| Prevention and control of phosphorus leaching in soil irrigated with biogas slurry by lanthanum modified biochar |
| Received:September 06, 2021 |
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| KeyWord:lanthanum modified biochar;inhibiting;biogas slurry;phosphorus;leaching loss |
| Author Name | Affiliation | E-mail | | ZHAO Di | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Lisheng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LUO Yuan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | ZHANG Keqiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Dali Agro-Environmental Science Station, Ministry of Agriculture and Rural Affairs, Dali 671004, China | wangfeng_530@163.com |
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| Abstract: |
| To explore the leaching characteristics and control effects of phosphorus in soil under irrigation conditions of lanthanum-modified biochar combined with biogas slurry, the soil column simulation test was used to compare the resistance and control characteristics of lanthanum-modified biochar, gypsum, and zeolite traditional inhibitors on phosphorus leaching, and the effects of the addition amount(1%, 3%, and 5%)and application method(0~20 cm and 0~10 cm mixture)of lanthanum-modified biochar. The results showed that the control effect of phosphorus leaching loss was lanthanum-modified biochar > gypsum > zeolite, and the control effect of lanthanum-modified biochar was the best(P<0.05). Compared with the control treatment, the total phosphorus leaching loss of lanthanum-modified biochar was reduced by 16.3%~58.3%, and the reduction effect was more evident with an increase in the amount of adsorbed phosphate and organophosphorus. The amount of leached total phosphorus was reduced by 23.4%~58.3% and 16.3%~45.0%, respectively, and the effect of mixed reduction of the whole soil layer was more significant(P<0.05). The adsorption mechanism of lanthanum-modified biochar for orthophosphate and organophosphorus was primarily precipitation and complexation. Results indicate that under the organic-inorganic composite phosphorus input, the application of lanthanum-modified biochar can prevent and control phosphorus leaching loss. |
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