Whitehead, D. C. <br/><br/>
The role of nitrogen in grassland productivity :  a review of information from temperate regions / 
D. C. Whitehead. 
 - Bucks, England :  Commonwealth Agricultural Bureaux,  c1970. 
 - viii, 202 p. :  ill. 
<br/><br/><label>ISBN: </label>0851980155 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen fertilizers.<br/>Soils--nitrogen content.<br/>Pastures--fertilizers.