Definition:
Conservation Agriculture (CA) is an agricultural practice, whereby the disturbed area is be less than 15 cm wide or 25% of the cropped area (whichever is lower). AQUASTAT distinguishes between 30%-60%, 61-90% and 91% ground cover.Ground cover must be measured after planting time. Ground cover less than 30% is not considered CA. Rotation must involve at least 3 different crops. Rotation is not a requirement for CA at this time, but AQUASTAT reports whether rotation is being carried out or not.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site