| Decomposition law and nutrient release characteristics of green manure Vicia Villosa L. in Qinghai Plateau |
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| DOI：10.7606/j.issn.1000-7601.2022.01.22 |
| Key Words: Vicia Villosa L. decomposition characteristic nutrient release Qinghai Plateau |
| Author Name | Affiliation | | MAO Xiaohong | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | LI Zhengpeng | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | YAN Qingbiao | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China | | HAN Mei | Academy of Agriculture and Forestry, Qinghai University, Xining, Qinghai 810016, China |
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| Abstract: |
| To determine the effect of green manure Vicia Villosa L. on soil fertility and provide nutrient resources for crops in Qinghai Plateau, the decomposition trends of Vicia Villosa L. and the nutrient release characteristics of nitrogen, phosphorus and potassium were studied with nylon mesh bags in the field. The results showed that the decomposition rate of green manure was 38% within 50 days after being turned over, and the decomposition rate was slow at the later stage. After sampling, the cumulative decomposition rate was 86.39%. In the whole decomposition process, the release rate all ranked as N>P>K, showing the same trend.The release rate of N and K was 56.54% and 74.27% in 52 days, respectively, while the release rate was slow in the later stage. At the end of decomposition, the cumulative decomposition rate of nutrients reached 91.31% and 99.04%. The release rate of phosphorus (P) was slow and fluctuating, and the content of phosphorus increased during the decomposition period. After sampling, the cumulative decomposition rate was 75.71%. The relationship between dry matter cumulative decomposition rate, nutrient cumulative release rate and decomposition time was fitted by linear function and logarithmic function. This experiment predicts that 172.80 kg·hm-2 of nitrogen, 10.93 kg·hm-2 of phosphorus and 139.63 kg·hm-2 of potassium would be left in the field for the following crops. |
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