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FERTILIZERS
NUTRIENT MANAGEMENT
3
PHYSICAL PROPERTIES
3
ACID SOILS
2
CLAY MINERALS
2
FARMING SYSTEM
2
GREEN REVOLUTION
2
SOIL FERTILITY
2
SOIL FORMATION
2
SOIL WATER
2
WATER CONSERVATION
2
ACID SOIL
1
CALCAREOUS SOIL
1
ENZYMES
1
FUNGICIDES
1
GENERAL
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HERBICIDES
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INSECTICIDES
1
ION EXCHANGE
1
MANURES
1
NEMATICIDES
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ORGANIC MATTER
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PHISICAL PROPERTIES
1
PLANT NUTRIENTS
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REACTION
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SOIL
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SOIL AMENDMENT
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SOIL COLLOIDS
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SOIL MINERALOGY
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