The extraction level of a resource which does not exceed its growth

(a)  

An effective and environmentally sensitive approach to pest management that relies on a combination of common-sense practices

(a)  

Cultivation in which different crops are sown in alternate strips to prevent soil erosion

(a)  

Making or forming land into a number of level flat areas resembling a series of steps

(a)  

The rearing of aquatic animals or the cultivation of aquatic plants for food.

(a)  

The single most important source of water in the High Plains region, providing nearly all the water for residential, industrial, and agricultural use.

(a)  

A naturally occurring solid material from which a metal or valuable mineral can be profitably extracted.

(a)  

Arable land on which no tillage is applied between harvest and sowing

(a)