| The characteristics of decomposing and nutrients releasing of three green manures in orchard in Southern Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2021.03.16 |
| Key Words: green manure decomposition nutrients release orchard extreme arid area |
| Author Name | Affiliation | | HE Wanrong | College of Animal Science, Tarim University, Alar Xinjiang, 843300, China | | HAN Lu | College of Plant Science, Tarim University | | XI Linqiao | College of Animal Science, Tarim University, Alar Xinjiang, 843300, China | | WANG Haizhen | College of Plant Science, Tarim University |
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| Abstract: |
| In order to investigate the nutrient decayed and released rules of green manures in the arid and saline area of Southern Xinjiang, Trifolium repens, Vicia villosa, and Brassica campestris were used as the experimental material in jujube orchard, Alar reclamation area. The nylon mesh\|bag embedding method was used to study the nutrient release of three green manures buried in 15 cm soil for 150 days, so as to provide theoretical basis for soil fertilization and interplanting grass in orchard. The results showed that three green manures were decomposed fast in the first 21 days after incubation, and the decomposition rates were more than 60%, then slowed down. After 150 days of incubation, the cumulative decomposition amounts of T.repens, V.villosa, and B.campestris reached 33.32 g, 15.91 g, and 22.87 g and the cumulative decomposition rates were 83.17%, 72.88%, and 69.92%, respectively. Among them, T.repens had the highest indexes in decomposition. The characteristics of different nutrients release from three green manures had significantly difference. Carbon (C), nitrogen (N), and potassium (K) were released rapidly in the initial 21 d, then slowed down until the end of experiment. Phosphorus (P) release showed a trend of continuous increase and had no obvious inflection point. The cumulative release rates of C, N, and K from the three green manures were 73.14%~86.23%, 68.18%~85.23%, and 77.92%~88.82% after 150 d, respectively. The residual rates of K were all lower than 2%, which were released quickly and thoroughly. The release rates of nutrients were in the order of K＞P＞C＞N, respectively. The cumulative release rates of C, N, P, and K of T.repens were the highest among all and reached 86.23%, 85.23%, 88.82%, and 99.61%, respectively. The residual rates of all nutrients had significantly difference with other two green manures (P＜0.05). V.villosa had the lowest release rate of C, N, and K except P, which were 15.18%, 20.01%, and 1.29% lower than that of the T.repens, respectively. The cumulative release amount and release speed of the three green manures were in the order of C＞K＞N＞P. The release amount and release rate of C, N and K of T.repens were significantly higher than that of other two green manures (P＜0.05), but the release amount and release rate of P in B.campestris were the highest and reached 16.71 mg·d-1 and 0.111 mg·d-1, respectively. Based on the above analysis, the dry matter decomposition and nutrient release of T.repens were better than that of V.villosa and B.campestris. The effect of fertilizing soil with T.repens was better, and it was worth popularized as raw grass in orchard in Southern Xinjiang. |
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