Table 2. Slow release fertilizer treatment application rates and percent time (from June-September) that plants did not meet the minimum phosphorus requirements of a 1,200 lb lactating cow with respect to fertilizer treatments on the extremely grazed and moderately grazed exclosures, Central Grasslands Research Extension Center, Streeter.

Fertilizer Type

Date Applied

Rate Applied

Extremely Grazed

Moderately Grazed

 

 

 

Percent time P deficient

Control

None

None

42%

37%

Phosphorus

37741

24 lb/ac

11%

12%

Phosphorus

37741

48 lb/ac

7%

2%

Phosphorus

37791

24 lb/ac

16%

11%

Phosphorus

37791

48 lb/ac

13%

9%

Urea

37791

33 lb/ac

31%

44%

Urea

37791

66 lb/ac

42%

49%