CHARACTERISTICS OF ORGANIC-MATTER IN UNDRAINABLE FISH POND SOILS

Characteristics of organic matter of undrainable fish pond soils with varying organic carbon contents (0.30-3.15%) were studied. Humus and i ts alkali soluble fractions increased with the increase in organic car bon content and the humus content was highly correlated (r = 0.971, p< 0.01) with the organic carbon content. Fulvic acid was the dominant fr action of humus in most of the soils and a significant correlation (r = 0.868, p<0.01) was observed with humic acid. Their ratio was correla ted with the level of humification (r = 0.779, p<0.01).