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SOIL CLASSIFICATION
SOIL SURVEY
3
ACID SOILS
1
AGRICULTURAL EXPERIMENTS
1
AGRICULTURAL METEOROLOGY
1
CHEMICAL PROPERTIES OF SOIL
1
CROP PRODUCTION
1
EARTH
1
IRRIGATION
1
MANURES AND FERTILISERS
1
NATURE AND FUNCTION OF SOIL
1
ORGANIC MATTER
1
PLANT GROWTH AND NUTRITION
1
ROCKS
1
SOIL
1
SOIL AND WATER
1
SOIL DEGRADATION
1
SOIL DEVELOPMENT
1
SOIL GENESIS
1
SOIL MORPHOLOGY
1
SOIL ORGANISMS
1
SOIL PHYSICS
1
SOIL SCIENCE
1
TILLAGE
1
WEED CONTROL
1
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