Effects of organic matter application on microbial biomass and available nutrients in various types of paddy soils

Autor:	Fujiyoshi Shibahara, Kazuyuki Inubushi
Rok vydání:	1997
Předmět:	chemistry.chemical_classification Soil organic matter Soil Science Soil classification Plant Science complex mixtures Soil management Agronomy chemistry Soil water Organic matter Soil fertility Gleysol Organic fertilizer
Zdroj:	Soil Science and Plant Nutrition. 43:191-203
ISSN:	1747-0765 0038-0768
DOI:	10.1080/00380768.1997.10414727
Popis:	Twenty three kinds of paddy soils with different applications of fertilizer or organic matter in 6 experimental fields (Gley soil, Gray Lowland soil, and Brown Lowland soil) were collected before flooding. Changes in the contents of microbial biomass carbon (C) and nitrogen (N) measured by the chloroform fumigation-extraction method and adenosine triphosphate (ATP) content in soils were investigated with reference to soil properties, especially available nitrogen and phosphate. Values of E C, extractable soil organic C after fumigation determined by automated combustion oxidation, were affected by the soil types and manuring practices, ranging from 92 to 545 mg C kg−1. In contrast, the values of E N, extractable total N after fumigation, were markedly affected by manuring practices, ranging from 7.8 to 67.7 mg N kg1. The E C/E N ratios also varied with the soil types and manuring practices (range 5-19), and decreased to 5-11 by submerged incubation, suggesting the occurrence of changes in the mic...
Databáze:	OpenAIRE
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