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Potassium-argon dating. --- Igneous rocks --- Dating. --- California.
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Fertilité du sol --- soil fertility --- Fertilisation --- Fertilizer application --- Engrais --- fertilizers --- Substance nutritive --- Nutrients --- Amendement du sol --- soil amendments --- Matière organique du sol --- soil organic matter --- Rendement des cultures --- Crop yield --- Relation plante sol --- plant soil relations --- Engrais à oligo-éléments --- Micronutrient fertilizers --- Azote --- Nitrogen --- Phosphore --- Phosphorus --- Potassium --- Fertilizers. --- Soil fertility. --- Crops --- Nutrition. --- 631.452 --- Plants --- Soils --- Fallowing --- Fertilizers --- Soil productivity --- Artificial fertilizers --- Chemical fertilizers --- Fertilisers --- Fertilization of soils --- Fertilizers and manures --- Field crops --- Agricultural chemicals --- Soil amendments --- Soil fertility --- Nutrition --- Fertilization --- Fertilizer movement --- 631.452 Soil fertility
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