各種有機物の施用に伴う土壌中の形態別リンの変化

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The purpose of this study was to estimate the crop residues (rice straw, wheat straw, corn shoot and chaff, beet leaves, soilage oats and rice husk) and organic materials (farmyard manure, chicken manure, bark compost and sewage sludge compost) as phosphorus materials, and to analyze the dynamics of organic, inorganic and available form phosphorus in soils with crop residues and organic materials applied to them successively for 17 y. Phosphorus contents in organic materials were higher than those in crop residues. Especially abundant were the inorganic phosphorus contents in chicken manure and sewage sludge compost. Among crop residues, the total and inorganic phosphorus contents in soilage oats were abundant. Soil organic phosphorus contents increased with successive application of wheat straw, corn shoot and chaff, beet leaves, rice husk and chicken manure. Soil organic and inorganic phosphorus contents increased with successive application of wheat straw+soilage oats or rice straw. Farmyard manure application increased inorganic phosphorus in soil. And successive application of sewage sludge compost, or bark compost increased organic and available phosphorus in soils. In particular, sewage sludge compost application brought a greater increase of available phosphorus. This probably suggests that sewage sludge compost is a better phosphorus material. It was surmised that the C/N ratio, N/P ratio and ratio of inorganic phosphorus to total phosphorus in crop residues were the main factors for phosphorus addition in soils.
社団法人日本土壌肥料学会の論文
2001-04-05

各種有機物の施用に伴う土壌中の形態別リンの変化

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