TY  - JA
AU  - Ludwick,A.E.
AU  - Langin,E.J.
AU  - Reuss,J.O.
TI  - Soil nitrates following four years continuous corn and as surveyed in irrigated farm fields of central and eastern Colorado
SN  - 0047-2425
U1  - 76-082962 
PY  - 1976///
KW  - Colorado
KW  - Fertilizers
KW  - AGROVOC
KW  - Maize
KW  - Zea mays
KW  - Soil fertility
N1  - 18 ref.; Summary (En)
T2  - Journal of Environmental Quality
ER  -