Table 3. Above ground production (lb/ac) for fertilizer treatments on moderately grazed mixed grass prairie at Central Grasslands Research Extension Center, Streeter.
Fertilizer Treatment
	Year	Control	May 1 24 lb P/ac	May 1 48 lb P/ac	June 20 24 lb P/ac	June 20 48 lb P/ac	June 20 33 lb N/ac	June 20 66 lb N/ac
Cool-season grass	2000^y	2174^abcd	2736^abcd	3166^bcd	2512^abcd	2671^abcd	2034^abc	1936^abc
	2001^y	2656^abcd	3127^bcd	2520^abcd	2740^abcd	2131^abcd	2877^abcd	3291^cd
	2002^x	1787^ab	1868^ab	1717^a	2036^abc	1931^abc	1985^abc	2198^abcd
	2003^y	2447^abcd	2535^abcd	2522^abcd	2292^abcd	2337^abcd	2932^abcd	3435^d
Warm-season grass	2000	36	3	1	0	1	160	64
	2001	0	18	0	0	192	1	0
	2002	31	2	1	0	20	2	3
	2003	0	0	61	62	65	0	0
Forb	2000^z	676^ab	532^ab	918^abc	1008^abc	748^abc	1421^bc	1169^abc
	2001^y	973^abc	439^a	828^abc	649^ab	773^abc	620^ab	441^a
	2002^x	533^ab	263^a	325^a	306^a	364^a	529^ab	271^a
	2003^z	1040^abc	773^abc	1656^a	1220^abc	797^abc	656^ab	539^ab
Shrub	2000^z	367	573	69	281	541	449	390
	2001^xy	191	247	189	174	263	255	315
	2002^x	88	218	111	92	226	187	269
	2003^xy	265	263	166	411	279	246	224
Total	2000^y	3254	3844	4156	3801	3962	4066	3561
	2001^y	3821	3833	3538	3564	3362	3755	4048
	2002^x	2441	2352	2154	2434	2542	2705	2741
	2003^y	3753	3572	4407	3986	3479	3835	4199
¹Means in a plant class followed by a different letter differ (P<0.05). ²Means in the year column in each plant class followed by a letter differ (P<0.05).