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What is used to convert wastelands into agricultural lands?

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in Energy Management by (679k points)
What is used to convert wastelands into agricultural lands?

(a) Check dams

(b) Water purifier

(c) Rain harvesters

(d) Gradonies

I had been asked this question in class test.

My query is from Soil and its Pollution in section Environmental Pollution of Energy Management

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Right answer is (d) Gradonies

To elaborate: Gradonies can be used to convert wastelands into agricultural lands. In this, narrow trenches with buds on the downstream side are built along contours in the upper reaches of the catchment to collect run-off and to conserve moisture from the trees.

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