Value of Manure Calculator What is the fertilizer replacement value of manure? What does it cost to apply? How much can I apply given labor and time constraints in the spring? Caroline Rasmussen, Patty Ristow, Karl Czymmek, and Quirine Ketterings

Manure as Nutrient Source Primary macronutrients: Nitrogen (N), phosphorus (P), potassium (K) Secondary macronutrients: Calcium (Ca), magnesium (Mg), sulfur (S) Micronutrients: Iron (Fe), boron (B), copper (Cu), chlorine (Cl), Manganese (Mn), molybdenum (Mo), zinc (Zn), cobalt (Co), and nickel (Ni)

Cornell University Nutrient Management Spear Program http://nmsp.cals.cornell.edu

Manure as Nitrogen Source

Manure as Nitrogen Source An example of a manure analysis:

Total Manure Nitrogen Urine Unstable Organic N (Fast N)

Stable Organic N. (Slow N)

Urea - mineralized rapidly to plant Ammonium available ammoniumN

Mineralized slowly during the year of application

Residual mineralized very slowly Organic N in future years

Inorganic N Ammonium N from present application

Available N =

%

lbs/ton

Feces

+

Mineralized organic N from present application

+

Mineralized organic N from past applications

Ammonium N in Manure • If incorporated in the fall, assume 100% loss. • If applied as sidedress injection for row crops, assume 100% fertilizer equivalent. • For spring application: Incorporation within: 1

2

3

4

5

65

53

41

29

17

>5 d after spreading 0 % available

Total Nitrogen (N) Ammonium Nitrogen Organic Nitrogen Phosphorus (P) Phosphate Equivalent (P2O5) Potassium (K) Potash Equivalent (K2O)

0.41 0.19 0.22 0.08 0.18 0.26 0.32

8 4 4 2 4 5 6

lbs/1000 gallons 34 16 18 7 15 22 27

Organic N in Manure

Cow manure