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Radioactiviteit --- Geologie --- Humus --- -Soil productivity --- -Soils --- -631.417 --- Earth (Soils) --- Mold, Vegetable --- Mould, Vegetable --- Soil --- Vegetable mold --- Agricultural resources --- Plant growing media --- Regolith --- Land capability for agriculture --- Productivity, Soil --- Agricultural productivity --- Crop yields --- Crops and soils --- Plant-soil relationships --- Soil fertility --- Soil management --- Muck --- Organic matter in soil --- Soil organic matter --- Soils --- Histosols --- Organic fertilizers --- Compost --- Plant litter --- Radioactivité --- Géologie --- Congresses --- Nitrogen content --- -Congresses --- Organic chemistry of soil --- Organic matter --- Composition --- Conferences - Meetings --- 631.417 Organic chemistry of soil --- Soil productivity --- Sols --- Productivité --- Teneur en azote --- Report --- Humus. --- Productivité. --- Teneur en azote.

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