TY  - BOOK
AU  - Whitehead,D.C.
TI  - The role of nitrogen in grassland productivity: a review of information from temperate regions 
SN  - 0851980155
PY  - 1970///
CY  - Bucks, England
PB  - Commonwealth Agricultural Bureaux
KW  - Nitrogen fertilizers
KW  - Soils
KW  - nitrogen content
KW  - Pastures
KW  - fertilizers
ER  -