By Planting Corn One Year and Beans the Next on a Given

Multiple Choice

By planting corn one year and beans the next on a given plot of land,or by planting alfalfa as a cover crop during the off-season,a farmer reduces the need for ___________ because beans and alfalfa fix nitrogen in the soil.

A) herbicides
B) pesticides
C) inorganic fertilizers
D) expensive irrigation techniques
E) harvesting machinery