Robinson, J. B. D. <br/><br/>
The soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on arable soils 

 - Slough :  Commonwealth Bureau of Soils,  1975 
 - 53 p. 
 - Special publication  ; 1 .
 - Special publication  ; 1 .
<br/><br/><label>LCCN: </label>49476 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrógeno--Efecto en plantas.<br/>Suelos--Nitrógeno en.