Question

What is Extensive commercial grain farming

Answer 1

Commercial grain farming is an extensive and mechanised form of agriculture. ... It was the invention of farm machinery which enabled farmers to cultivate grain on a large scale, and there is a marked specialisation in wheat monoculture in many areas.

Answer 2

Extensive farming or extensive agriculture (as opposed to intensive  farming) is an agricultural production system that uses small inputs of labor, fertilizers, and capital, relative to the land area being farmed.