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soil fertility --- soil fertility --- Fertilizer application --- Fertilizer application --- Belgium --- Belgium
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FAO --- FAO --- Erosion. --- Erosion --- soil fertility --- soil fertility --- Productivity --- Productivity
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soil fertility --- soil chemistry --- Phosphorus --- Aluminium --- Malaysia
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Erosion. --- Erosion --- soil fertility --- soil fertility --- Land productivity --- Land productivity --- FAO --- FAO
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631.46 --- 631.452 --- 631.452 Soil fertility --- Soil fertility --- 631.46 Soil bacteriology. Soil biology --- Soil bacteriology. Soil biology --- Soil biology --- Biology --- Natural history --- Congresses
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Water erosion --- Water erosion --- soil fertility --- soil fertility --- Zea mays --- Zea mays --- Plant breeding --- Plant breeding --- Insect control --- Insect control --- research --- research --- Kari --- Kenya --- Kenya --- Kari
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Tropical soils --- Humid zones --- soil fertility --- Phosphorus --- Potassium --- Soil water content --- Gent --- Gent
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soil chemistry --- soil fertility --- Phosphorus --- Zinc --- Soil --- Mineral nutrients --- pH --- soil chemicophysical properties --- Gent --- Malaysia --- Gent
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Soil --- Soil water balance --- Soil profiles --- Soil classification --- Topography --- soil morphological features --- soil fertility --- land use --- Geomorphology --- Belgium --- Belgium
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soil fertility --- Mineral content --- Zinc --- Copper --- soil chemicophysical properties --- Vertisols --- Gent --- Chemical activity --- Aridisol --- Sudan --- Gent --- Chemical activity --- Aridisol
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