The process of manganese depositton in paddy soils

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Abstract
Certain differences among 4 plots with different fertilizer treatments at Cent. Agric. Exp. Sta. fn Konosu City, Saitama Prefecture, were studied from the point of population dynamics of the microorganisms responsible for the Mn-deposition. The tiny Mn-deposits were detected with benzidine solution and observed under microscope. The number of the tiny Mn-deposits in the plough layer before flooding was decreased in the following order; plot applied with green manure≥plot applied with no fertilizer≥plot applied with inorganic fertilizers≫plot applied with manure. The almost same order in the abundance of the tiny Mn-deposits was found in a model system for the paddy field. An aspect of growth habit of the Mn-oxidizing microorganisms and also possible existence of two types of the Mn-oxidizing microorganisms with different growth habit were inferred; one is living free from soil particles in the medium rich in water-soluble organic nutrients and the other grows on the soil particles in the medium poor in water-soluble organic nutrients. Some or the Mn-oxidizing microorganisms were isolated and characterized. They were identified as Pseudomonas sp, and Bacillus sp, The isolated Pseudomonas sp. was cultured and their ability of Mn-oxidation was measured. It was found that Mn-oxidation began only after the microorganisms reached in the stationary phase. This result seems to correspond to the growth habit of the type ot Mn-oxidizing microorganisms living free trom soil particles.

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