| Step 1 |
Nutrient needs of crop (lbs/acre)
Recommendations based on soil test results and a realistic yield goal.
|
Example: N= __180___
P2O5= ___95___
K2O= ___40___ |
Your Number: N= ________
P2O5= ________
K2O= ________ |
| Step 2 |
Total nutrient value of effluent
(lbs/1000gal.) Based on manure analysis of a representative sample collected close
to time of application. |
N= ___5.2___ P2O5=
___1.3___
K2O= ___5.9___ |
N= ________ P2O5=
________
K2O= ________ |
| Step 3 |
Determine available nutrients (lbs/1000gal) Multiply
the value from Step 2 by nutrient availability, 50% for N and 90% for P and K |
N= ___2.6___ P2O5=
___1.2___
K2O= ___5.3___ |
N= ________ P2O5=
________
K2O= ________ |
| Step 4 |
Calculate the rates of application needed for
N, P and K (1000gal/acre) Divide values from Step 1 by values from Step 3. |
N= ___69___ P2O5=
___79___
K2O= ___7.5___ |
N= ________ P2O5=
________
K2O= ________ |
| Step 5 |
Select the rate of effluent to be applied
(1000gal/acre) Choose the nutrient for which the manure rate is to be based. Select
the highest of three if manure is used as a complete fertilizer; select the lowest for
maximum nutrient use efficiency. |
Rate= ___69___
(based on N needs for this example) |
Rate= ________ |
| Step 6 |
Determine amount of available nutrients being
applied (lbs/acre) Multiply the rate chosen in Step 5, by available nutrients, Step
3. |
N= __180___ P2O5=
___83___
K2O= __366___ |
N= _______ P2O5= _______
K2O= _______ |
| Step 7 |
Determine amount of supplemental nutrients
needed (lbs/acre) Subtract the nutrients being applied, Step 6 from nutrients
needed, Step 1. If the difference is negative, more nutrients applied than needed. |
N= ___0____ P2O5=
___12___
K2O= ___0____ |
N= _______ P2O5= _______
K2O= _______ |
| Step 8 |
Determine total depth of application
(acre-inch) Divide gal/acre from Step 5 by 27,000 to get irrigation depth needed to
provide nutrients. |
=__2.6_Acre-inches |
=_____Acre-inches |
| Step 9 |
Determine number of application and amount of
each application Based on growth stages and crop nutrient needs at each growth
stage, and amount of nutrients applied each time. |
1st= 1.0 Acre-inch 2nd=
0.8 Acre-inch
3rd= 0.8 Acre-inch |
1st=____Acre-inch 2nd=____Acre-inch
3rd=____Acre-inch |
