Conversions and Volumes

General

• lb P₂O₅ x 0.44 = lb P
• lb P x 2.29 = lb P₂O₅
• lb K₂O x 0.83 = lb K
• lb K x 1.2 = lb K₂O

Soil

• Parts per million (ppm) x 2 = lb/acre
• 5 lb P₂O₅ increases soil P test value by 1 ppm
• 1.75 lb K₂O increases soil K test value by 1 ppm

Manure - General

• Typical density of swine manure = 62 pounds per cubic foot
  Tons x 32.26 = cu ft
  Cu ft x 0.0310 = tons
  Tons x 242 = gallons
  Gallons x 0.00414 = tons
• Total available N (TAN) or Plant available N (PAN) = NH₄ + -N + mineralized organic N
• About 35% of the organic N is mineralized to inorganic N in year it is applied

Liquid Manure

• ppm / 10,000 = %
• Lb/1000 gal= ppm/120
• lb/1000-gallons / 83 = %
• ppm P x 0.019 = lbs P₂O₅/1000 gallons
• ppm K/100 = K₂O/1000 gallons
• % P x 192 = lb P₂O₅/1000 gallons
• % K x 100 = lbs K₂O/1000 gallons

Solid Manure

• lb/ton / 20 = %
• Lb/ton = ppm/500
• ppm P X 0.0046 = lb P₂O₅/ton
• ppm K x 0.0024 = lb K₂O/ton
• % P x 46 =lb P₂O₅/ton
• % K x 24 = lb K₂O/ton

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