期刊
APPLIED SOIL ECOLOGY
卷 108, 期 -, 页码 211-220出版社
ELSEVIER
DOI: 10.1016/j.apsoil.2016.08.017
关键词
Anion exchange resins; Canavalia brasiliensis; Mineralizable N; P mineralization; Technosols; dTithonia diversifolia
类别
资金
- Volkswagen Foundation (Volkswagen Stiftung, Hannover, Germany) under the Coltan Environmental Management Project
- German Academic Exchange Service (DAAD)
Nitrogen (N) and phosphorus (P) remain the most limiting plant nutrients in most mine soils, particularly in the tropics. We estimated the potential mineralizable N of the biomass of Canavalia brasiliensis and goat manure and P mineralization of Tithonia diversifolia biomass and goat manure in tantalite mine soils of western Rwanda. The mineralizable N was estimated through a four-week incubation of amended soil sand mixtures followed by fortnightly leaching with 200 ml of 0.01 M CaCl2. Conversely, Phosphorus mineralization was estimated from four-week incubation of amended soil-resin mixtures. The resins were separated from the soils and eluted with 0.5 M HCl to estimate phosphate content. Among the treatments, Canavalia had the highest mineralizable N (130 mu g g(-1) soil, P < 0.01) in the Kavumu Technosol while the native forest soil had the lowest (-20 mu g g(-1) soil). Goat manure had negative mineralizable N in all soils but was 30-70% less severe in the cultivated soils. P mineralization in goat manure was triple that of Tithonia, constituting 61-71% of total P applied. Each amendment uniquely contributed to N and P supply, suggesting optimum benefits of N and nutrient release as well as soil organic matter accrual through combined application in specific ratios or co-composting. (C) 2016 Elsevier B.V. All rights reserved.
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