Removing Plants from an Area, as We Do When We

Multiple Choice

Removing plants from an area, as we do when we harvest crops, removes a great deal of nitrogen. One of the ways farmers enable soils to naturally recover nitrogen content is:

A) adding industrially produced fertilizer.
B) planting the field with legumes.
C) adding bacteria to the soil.
D) leaving the soil bare and removing any plants that would consume nitrogen.