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- soil conservation[remove]3
- soil erosion2
- wheat2
- contour farming1
- cost benefit analysis1
- dynamic programming1
- economic analysis1
- economic depression1
- environmental impact1
- erosion control1
- fallow1
- governmental programs and projects1
- hills1
- laws and regulations1
- plowing1
- soil erosion models1
- stubble mulching1
- terracing1