Table 1. Aboveground production (lb/ac) for fertilizer treatments on extremely grazed mixed grass prairie at Central Grasslands Research Extension Center, Streeter, North Dakota 2000-2003.

 

 

Fertilizer Treatments

  

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

2000r

1285ab

1192ab

1205ab

1085a

1082a

1215ab

1366abc

2001y

1924abcdef

1972bcdef

1943bcdef

1934abcdef

1973bcdef

1540abcd

2319def

2002x

1401abc

1562abcd

1400abc

1605abcde

1467abc

1711abcde

1934abcdef

2003z

2546f

2428ef

2629f

2205cdef

2362def

3562g

3996g

Warm-season

grass

2000

48

163

68

203

24

44

57

2001

7

23

13

180

57

133

82

2002

366

33

120

115

234

203

28

2003

129

72

136

206

57

61

303

Forb

2000y

641

521

562

593

530

632

726

2001y

686

443

766

554 

473

921

640

2002x

188

391

482

323

327

377

215

2003z

1071

884

1101

1112

889

920

987

Shrub

2000x

60

29

91

28

102

54

51

2001x

36

74

9

67

70

80

68

2002x

17

26

30

25

51

71

43

2003y

181

211

118

195

323

394

62

Total

2000x

2035a

1907a

1927a

1910a

1739a

1946a

2202ab

 

2001y

2654abc

2514ab

2733abcd

2737abcd

2573ab

2675abc

3110bcde

 

2002x

1974a

2013a

2034a

2068ab

2080ab

2363ab

2221ab

 

2003z

3929

3598cde

3986

3719de

3633cde

4939f

5349f

1Means in a plant class followed by a different letter differ (P<0.05).

2 Means in the year column in each plant class followed by a letter differ (P<0.05).