C, N, and S mineralization of crop residues as influenced by crop species and nutrient regime
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
The mineralization of C, N, and S from residues of three different crop species (wheat, lentil, and rape) grown under diverse nutritional regimes was measured over a 12-week incubation period under controlled conditions. The rate of decomposition, as measured by CO2 evolution, varied considerably among treatments and appeared to be controlled almost entirely by N content of the residue (R2=0.98). Similarly, N mineralization was strongly tied to N concentration. The critical N concentration, below which significant immobilization of N occurred, declined over time, ranging from 1.9% at day 14 to 1.1% at day 84. Mineralization of S was positively correlated with initial S concentration (R2=0.95) and negatively related to N concentration, apparently because of a dilution effect. The results demonstrate that decomposition and N and S mineralization of crop residues, under conditions prevalent in the experiment, are primarily a function of their nutrient concentrations rather than biochemial composition related to crop species. As a result, it should be possible to enhance rate of residue decomposition, increase quantities of N and S mineralized, and avert detrimental immobilization losses in the following year by governing the nutritional regime under which the crop is grown.
- Bartholomew W V 1965. Mineralization and immobilization of nitrogen in the decomposition of plant and animal residues.In Soil Nitrogen. Eds W V Bartholomew and F E Clark. pp 285–306. Agronomy 10.
- Bremner J M 1965. Inorganic forms of nitrogen.In Methods of Analysis. Part 2. Eds. C A Blacket al. pp 1179–1237. Agronomy 9.
- Dormaar, J F, Pittman, U J (1980) Decomposition of organic residues as affected by various dryland spring wheat-fallow rotations. Can. J. Soil Sci. 60: pp. 97-106
- Harper, S H T, Lynch, J M (1981) The chemical components and decomposition of wheat straw leaves, internodes and nodes. J. Sci. Food Agric. 32: pp. 1057-1062
- Herman, W A, McGill, W B, Dormaar, J F (1977) Effects of initial chemical composition on decomposition of roots of three grass species. Can. J. Soil Sci. 57: pp. 205-215
- Parr J F and Papendick R I 1978. Factors affecting the decomposition of crop residues by microorganisms.In Crop Residue Management Systems. Ed. W R Oschwald. pp 101–129. Am. Soc. of Agron. special publication No. 31, Madison, WI.
- Reinertsen, S A, Elliott, L F, Cochran, V L, Campbell, G S (1984) Role of available carbon and nitrogen in determining the rate of wheat straw decomposition. Soil Biol. Biochem. 16: pp. 459-464 CrossRef
- Stanford, G, Smith, S J (1972) Nitrogen mineralization potentials of soils. Soil Sci. Soc. Am. Proc. 36: pp. 465-472
- Thomas, R L, Sheard, R W, Moyer, J R (1967) Comparison of conventional and automated procedures for nitrogen, phosphorus, and potassium analysis of plant material using a single digest. Agron. J. 59: pp. 240-243
- Tiessen, H, Bettany, J R, Stewart, J W B (1981) An improved method for the determination of carbon in soils and soil extracts by dry combustion. Comm. Soil Sci. Plant Anal. 12: pp. 211-218
- C, N, and S mineralization of crop residues as influenced by crop species and nutrient regime
Plant and Soil
Volume 106, Issue 1 , pp 35-41
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- crop residue
- organic matter
- Industry Sectors