Trinidad Santos, Antonio. <br/><br/>
An evaluation of the nitrogen production potential of hairy vetch (Vicia villosa R.) and Crimson clover (Trifolium incarnatum L.) in mulch-planted corn 

 - Raleigh, N.C. :  The author,  1978 
 - 291 h.  : gráfs. 
<br/><br/>Tesis (Doctor of Philosophy) -- North Caroline State uUniversity at Raleigh 
<br/><br/><label>LCCN: </label>51920 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abonos verdes.<br/>Abonos--Efecto en maiz.<br/>Rotación de cultivos.<br/>Trifolium incarnatum.<br/>Vicia villosa.