Potential of intercropping soybeans (&lt;em&gt;Glycine max&lt;/em&gt; (L.) Merrill) and cowpea (&lt;em&gt;Vigna unguiculata&lt;/em&gt; L. Walp) with sunflower (&lt;em&gt;Helianthus annuus&lt;/em&gt; L.) in the transition zone of south west Nigeria
Tropical Agricultural Research and Extention