To Provide nutrients to crop plants in required quantities based on, Climate (Tropical/temperate) Type of crop (Legume/non legume) Season (Kharif/rabi/summer) Type of soil (Texturally, fertility status)

Provide nutrients in appropriate form Readily available Slowly available Fixed in the soil Provide nutrients at right time Critical phase for nutrient Type of fertilizer/manure Provide nutrients by right method Mobility of nutrient Type of nutrient (Macro/micro, soil/plant) Loss of nutrient (Volatilization/leaching)

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