reducing dietary p reduces overall solubility of manure p n.
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REDUCING DIETARY P REDUCES OVERALL SOLUBILITY OF MANURE P. Manure from cows fed 0.48% P lost 10 times as much P to runoff from agronomic plots as manure from cows fed 0.32% P. When manure was applied to give equal P application rates, runoff was 4 times greater with the high P manure.

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reducing dietary p reduces overall solubility of manure p
REDUCING DIETARY P REDUCES OVERALL SOLUBILITY OF MANURE P

Manure from cows fed 0.48% P lost 10 times as much P to runoff from agronomic plots as manure from cows fed 0.32% P.

When manure was applied to give equal P application rates, runoff was 4 times greater with the high P manure.

how can we calculate p balance for a farm
HOW CAN WE CALCULATE P BALANCE FOR A FARM?

Imports

Protein Supplements

Mineral Supplements

Grain / By –Products

Forage

Fertilizer

Exports

Milk

Cull Cows and Calves

Surplus feed

Manure?

Runoff?

if all grain is purchased and forage raised at home
If All Grain Is Purchased and Forage Raised at Home

EXPORT

IMPORT

2000 lb soybean meal

12.2

20,000 lb milk/yr

18.0

3

Cull cows and calves

Dicalcium phosphate

3.0

(To .38% P in diet)

16.2

Surplus feed

0

6000 lbs corn grain

Forage

0

Manure

0

0

Runoff

~2

Fertilizer

Total

31.4

23.0