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| Titel: |
Decomposition and Humification in Soil of Plant Residues Differing in Chemical Composition |
| Auteur: |
M.H. Sajjad H.N. Bhatti A. Lodhi F. Azam |
| Verschenen in: |
Journal of agronomy |
| Paginering: | Jaargang 1 (2002) nr. 2 pagina's 92-97 |
| Jaar: |
2002 |
| Inhoud: |
Soil samples amended with powdered plant material of wheat, maize, and sesbania were incubated for 8 weeks at moisture content of 60% of the maximum water holding capacity and 22-26<SUp>o</SUp>C for 8 weeks. At 0, 2, 4 and 8 weeks of incubation, portions of soil were analyzed for I) total C and its distribution in humic and fulvic acid fractions and ii) optical properties of humic acid. Humus fractions were extracted with both sodium hydroxide (NaOH) and sodium pyrophosphate (Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>). Higher amounts of humus C were extracted with NaOH than with Na<SUB>4</SUB>P<SUB>2</SUB>O<SUB>7</SUB>; the treatment differences were more obvious in former. Organic amendment resulted in higher amounts of humic and fulvic acid; more humus C being found in soil amended with maize and wheat. More N was determined in humic acid compared with fulvic acid following the extraction of soil with NaOH. Nature of organic amendment and the extractant used had a significant effect on C/N ratio of humic compounds. Optical density of the humic acid fraction decreased at the increasing wavelength and was correlated significantly with the C content of humic acid. Duration of incubation and nature of amendment had a significant effect on the polymerization and maturity of the humic acid fraction. |
| Uitgever: |
Asian Network for Scientific Information, Pakistan |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 30 gevonden artikelen
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