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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.

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REDUCING DIETARY P REDUCES OVERALL SOLUBILITY OF MANURE P

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  1. 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.

  2. WE NEED TO THINK IN TERMS OF P IMPORT AND EXPORT ON THE FARM

  3. 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?

  4. 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

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