Which of the following was NOT a technique used in the first green revolution

Biotechnology is the necessary way to increase food production without affecting other lands, avoiding risks of erosion, catastrophic floods or decreasing biodiversity.

Green Revolution is the denomination used to describe the significant increase in agricultural productivity and therefore of food between 1960 and 1980 in the United States that later spread to other countries.

The green revolution consisted of planting improved varieties of corn, wheat and other grains, growing a single species in a field throughout the year,