Distribution of free oxides along soil profiles in time series of dry rice fields in polder lands of Kojima-basin

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Abstract
The distributions of free oxides along profiles of some dry rice fields were set forth in the previous reports2,3,4,6), In this paper, the distribution of free oxides in dry rice field5) in polder lands of Kojima-Basin, Okayama pref. is reported. Localities, years elapsed since the planting of rice began in each field and the characteristic of soil profiles are given in Table 1. All the fields are dry rice fields except Soil A, and carry barley or wheat in winter season. Parent materials are similar in all horizons of all soils and rich in fine particles. Fine sands (0.2-0.02 mm) are mainly composed of quartz somewhat accompanied with feldspars, mica, augite and amphibolite. Clays (< 0.002 mm) are mainly composed of halloysite accompanied with a small proportion of montmorillonite. The structure develops well in all the soils.

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