Table 9. Per acre production of crude protein from crested wheatgrass plots fertilized annually with ammonium nitrate (33-0-0).
Treatment	Crude protein - lbs. per acre				4-year average
	1955	1956	1957	1958
Check (No N)	98	64	123	114	100
Very light (25# N)	174	116	265	181	184
Light (50# N)	176	131	293	210	203
Medium (100# N)	244	119	315	261	235