Changes of some chemical constituents in different soil depth with textures of Fluvio-marine soil under assessment of reclamation duration
1987
Kim, S.C (Chonnam Provincial Rural Development Administration, Kwangju (Korea R.))
Exchangeable potassium, calcium, magnesium, sodium with manganese, silica and cation exchange capacity were remarkably decreased with assessment reclamation duration. Decreasing tendency was pronounced more in sandy soil than silty loam or clayly soil. Soil organic matter content in top soil was increased with increasing reclamation years. From reclamation time, about 30 years in clayly and about 80 years in silty loam and sandy soil were necessary1853for the maintenance of averaged organic matter content to 2.5 %. Potassium activity ratio differed with soil depth, soil texture and assessment of reclamation duration. About 50 years may be necessary for the maintenance of potassium activities ratio in ordinary paddy soil of 0.05-0.02. Percent of adsorbed sodium (PAS), ratio of adsorbed sodium (RAS), and ratio of sodium adsorption (RSA) were remarkably decreased with assessment of reclamation duration. Specially, decreasing tendency was pronounced more in sandy soil than silty loam and clayly so
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