Torssell, B. W. R. <br/><br/>
Predicting economic optimum and nitrogen balance in the ley - ruminant system 

 - Uppasala  Department of Crop Production Science  1990 
 - 48p.  24cm 
 - Crop ProductionScience 10 .
<br/><br/><label>ISBN: </label>9157643490 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Production efficient<br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>338.16  / TOR