| Effects of biogas slurry application on organic carbon and nitrogen components of alfalfa cultivation soil |
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| DOI：10.7606/j.issn.1000-7601.2024.03.10 |
| Key Words: biogas slurry organic carbon organic nitrogen alfalfa calcareous soil |
| Author Name | Affiliation | | RU Liyang | Agricultural College of Henan University of Science and Technology, Luoyang, Henan 471023, China | | CHANG Huiqing | Agricultural College of Henan University of Science and Technology, Luoyang, Henan 471023, China
Henan Xinda Animal Husbandry Co., Ltd, Zhengzhou, Henan 450001, China |
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| Abstract: |
| A field trial was used to determine the effects of biogas slurry on organic carbon and nitrogen components of calcareous soil planted with alfalfa. The study included treatments of control without fertilizer, conventional fertilizer nitrogen, 20% fertilizer nitrogen content of biogas slurry+80% fertilizer nitrogen, 50% fertilizer nitrogen content of biogas slurry+50% fertilizer nitrogen and biogas slurry based on conventional application of fertilizer nitrogen of 100% and 200%. The results showed that the contents of amino acid nitrogen and total acid hydrolysis nitrogen in soil increased with the increase of the combined application ratio of biogas slurry. Compared with single application, the contents of amino acid nitrogen and total nitrogen were significantly increased by 13.93%~37.21% and 8.22%~21.71%, respectively. Application of 20%~50% biogas slurry was beneficial to the increase of soil non\|acidolysis nitrogen. Compared with 100% biogas slurry application, the contents of unknown nitrogen and total nitrogen in 200% biogas slurry application decreased by 9.01%~37.00% and 0.89%~7.87%, respectively. The application of biogas slurry was beneficial to the increase of soil acidolysis nitrogen, especially amino acid nitrogen. Total nitrogen was positively correlated with total nitrogen, amino sugar nitrogen and unknown nitrogen. The contents of humic acid, fulvic acid, free humic acid and organic carbon in soil increased with the increase of biogas mixture ratio. Compared with single fertilizer application, 100% and 200% application of biogas slurry significantly increased the fulvic acid content, 50% application of biogas slurry significantly increased the humic acid content, and the ratio of humic acid to fulvic acid decreased with the increase of biogas slurry application ratio. Organic carbon was positively correlated with humic acid, free humic acid, residual carbon and fulvic acid. In summary, under the conditions of this study, it is suggested that when the amount of biogas slurry is 100% nitrogen fertilizer, it is more conducive to the accumulation of soil organic carbon and nitrogen components. |
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