 |
The
current consensus is that crop rotation increases yield and profit.
At times, an increase in nitrogen from legumes in the rotation is
primarily responsible for the yield increase; at other times, the
decrease in pest pressure has a major influence. But even those two
factors do not entirely explain the yield boost.
Over the years, there has been a significant shift away from extended,
or long-term, crop rotations, which include sod, pasture, or hay.
The vast majority of corn land is grown in a short-term rotation
with soybeans, and this has greatly affected the rate of soil erosion.
|