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Decomposition kinetics of straw saccharides and synthesis of microbial saccharides under field conditions
Author(s) -
MURAYAMA S.
Publication year - 1984
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1984.tb00279.x
Subject(s) - straw , chemistry , decomposition , kinetics , rhamnose , fraction (chemistry) , rice straw , xylose , reaction rate constant , zoology , agronomy , food science , galactose , organic chemistry , inorganic chemistry , biology , fermentation , physics , quantum mechanics
SUMMARY The decomposition of rice and barley straw saccharides under field conditions was well represented by the first‐order kinetics model of Y t = C 1 e − k 1 t + C 2 e − k 2 t , where Y t is the remaining amount at time t, k 1 and k 2 are the decomposition rate constants (time −1 ) for the labile fraction ( C 1 ) and the non‐labile fraction ( C 2 ), respectively. About 82% of the total saccharide content of the rice straw was in the labile fraction with a rate constant 0.64–0.81, the values for the barley straw being 70–92% and 0.50–0.61, respectively. The non‐labile fraction appeared to persist for a long time, with a half‐value period of 9–59 months. Barley straw and its saccharides decomposed at a slower rate than rice straw. Much more favourable initial decomposition was observed in a paddy field than in an upland field. Mannose, fucose, rhamnose and ribose were synthesized in parallel with the flush of decomposition of straw saccharides.