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Soil biology --- -Soil fertility --- -Soil management --- -Tropics --- Soil fertility --- Soil management --- 631.11 <213.5> --- 631.452 --- 631.46 --- 631.46 Soil bacteriology. Soil biology --- Soil bacteriology. Soil biology --- 631.452 Soil fertility --- 631.11 <213.5> Farms, farm properties and farming systems--Tropische zones. Tropen --- Farms, farm properties and farming systems--Tropische zones. Tropen --- Soils --- Soil science --- Agronomy --- Fallowing --- Fertilizers --- Soil productivity --- Biology --- Natural history --- Management --- Fertilization --- Fertilizer movement --- Soil biology - - Tropics --- Soil fertility - - Tropics --- Soil management - - Tropics --- -Soil biology