Rates of anaerobic decomposition of IR68 and its brittle mutant

Crop residues, when incorporated in soil, are potential sources of nutrients, and proper residue management can maintain or enhance soil fertility. rapid decomposition of straw would be advantageous from a crop residue use perspective because it would decrease the time during which incorporated resi...

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Published inPhilippine Journal of Crop Science (Philippines Vol. 30; no. 1
Main Author Cabiles, D.M.S.; Johnson, S.E.(International Rice Research Inst.DAPO Box 7777, Metro Manila (Philippines) samonte, H.P.; Brar, D.; Burosh, R.J.)
Format Publication
LanguageEnglish
Published 01.05.2005
Subjects
DEGRADACION
DEGRADATION
GROSSEUR DES PARTICULES
METANO
METHANE
ORYZA SATIVA
PAILLE DE RIZ
PAJA DE ARROZ
PARTICLE SIZE
RICE STRAW
TAMANO DE LA PARTICULA
VARIEDADES
VARIETE
VARIETIES
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Summary:Crop residues, when incorporated in soil, are potential sources of nutrients, and proper residue management can maintain or enhance soil fertility. rapid decomposition of straw would be advantageous from a crop residue use perspective because it would decrease the time during which incorporated residue might hinder plant growth because of N immobilization. The objective of this study was to determine the influences of genotypic rice straw brittleness or straw decomposition under flooded conditions, with the hypothesis that the brittleness of the straw would increase its decomposition rate. A brittle mutant of IR68 was developed by the International Rice Research Institute, a result of chemically induced mutation. The effects of different threshing methods on straw particle sizes, of IR68 regular and its brittle mutant were investigated. The straw of the brittle mutant broke into smaller pieces than did the regular straw for all the threshing m ethod employed. Anaerobic decomposition rates of IR68 regular and mutant as influenced by straw particle size were compared in terms of C02 evolution, methane emissions, and nutrients released. Results showed that the brittle straw decomposed faster than the regular straw at the same straw particle size, and that the smaller sizes decomposed faster than the larger ones. It was concluded that genotypic straw brittleness enhanced rapid decomposition of the straw under unaerobic conditions because of its tendency both to break into smaller pieces upon threshing and decompose faster as the same straw size. Scientific Conference of the Federation of Crop Science Societies of the Philippines Lapasan, Cagayan de Oro City (Philippines) 2-6 May 2005
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