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Nitrogen Mineralization in Soil Amended with Compost and Urea as Affected by Plant Residues Supplements with Controlled C/N Ratios

Nguyen Thanh Binh 1,2 and Kazuto Shima 1
1. Department of Soil Agro-Chemistry, Faculty of Agronomy, Nonglam University, Ho Chi Minh City, Vietnam
2. Department of Environmental Ecology, Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
Abstract—Plant residues supply carbon-rich source but also affect nitrogen (N) dynamic in the plant–soil system. Two consecutive incubations were conducted to examine soil net N mineralization from compost and urea as affected by additions of carbon sources with controlled C/N ratios. For incubation 1–set 1, powder of bamboo stem (BS) was incorporated into paddy soil with increasing rates from 0 to 2457.2 mg total C/kg soil that can cover a wide range of C used in the later incubations. For incubation 1–set 2, either sewage sludge compost or urea was added with BS to increase their C/N ratios up to 10 and 25. Amended materials were then incorporated into paddy soil at the same rate of 100 mg total N/kg soil. For incubation 2, we compared the effectiveness of three different carbon sources, i.e., BS, powder of residual wood for building (WB) and rice straw (RS) on potential N immobilization of compost-amended sandy soil after regulating C/N values of amendments up to 25. The major results obtained were as follows: 1) The net N mineralization rates decreased with increasing amounts of added-C, indicating the immediate availability of the BS. 2) N immobilization of nitrate was greatest in treatment of BS and compost (C/N=25), whereas, N immobilization of ammonium was found in treatments of BS and urea (both C/N=10 and C/N=25). 3) N immobilization was significantly greater in the soil incorporated with BS and RS than that with WB. Our findings suggest that the mineralization–immobilization turnover (MIT) of N in soil can be controlled by adding readily available plant residues.
Index Terms—ammonium, compost, immobilization, mineralization, nitrate, plant residues

Cite: Nguyen Thanh Binh and Kazuto Shima, "Nitrogen Mineralization in Soil Amended with Compost and Urea as Affected by Plant Residues Supplements with Controlled C/N Ratios," Journal of Advanced Agricultural Technologies, Vol. 5, No. 1, pp. 8-13, March 2018. Doi: 10.18178/joaat.5.1.8-13
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