Silage maize growing in a cover-crop trial. Showing two adjacent plots, neither plot has had nitrogen fertilizer topdressing. Dark green maize plants on the left are in a plot which had grazing vetch planted as a cover crop the previous winter. Yellowing maize on the right had no cover crop the previous winter. Cedara Research Station, KwaZulu-Natal.
<a href="//commons.wikimedia.org/wiki/User:Alandmanson" title="User:Alandmanson">Alandmanson</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>