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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
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Agriculture --- Soil degradation --- Soil fertility --- Environmental Sciences and Forestry. Soil Science --- Soil Fertility. --- 631.452 --- 631.458 --- 631.47 <213.5> --- 631.96 --- 631.96 Types of plantation. Appraisal of site --- Types of plantation. Appraisal of site --- 631.458 Impoverishment of soil. Soil exhaustion --- Impoverishment of soil. Soil exhaustion --- 631.452 Soil fertility --- Soils --- Fallowing --- Fertilizers --- Soil productivity --- Degradation, Soil --- Land degradation --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- 631.47 <213.5> Surveying, classification and utilization of land. Soil profiles. Litter. Humus. Topsoil. Subsoil etc. Micropedology--Tropische zones. Tropen --- Surveying, classification and utilization of land. Soil profiles. Litter. Humus. Topsoil. Subsoil etc. Micropedology--Tropische zones. Tropen --- Fertilization --- Fertilizer movement --- Soil fertility - Tropics --- Soil degradation - Tropics --- Agriculture - Tropics - Case studies
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