Table 8. Crude protein content of crested wheatgrass hay from plots fertilized annually with ammonium nitrate (33-0-0).
Treatment Crude protein - percent
1955 1956 1957 1958 4-year average
Check (No N) 7.7 10.5 9.1 9.3 9.2
Very light (25# N) 8.3 15.4 12.5 10.8 11.8
Light (50# N) 8.3 17.2 14.2 11.4 12.1
Medium (100# N) 9.8 17.8 14.5 13.1 13.8