N Calculator Recommendation for Corn
NITROGEN DEFICIENCY
TIP:
You can go to http://www.gocorn.net to change the information to match your 2011 corn cropping scenarios.
| Factor |
Input |
N Rate
(lb/acre) |
| Base N Requirement (select soil texture) |
Loam |
+28 |
| Yield Adjustment (enter proven yield) |
175 |
+135 |
| Heat Unit Adjustment (enter CHU rating) |
3000 |
+7 |
| Previous Crop Adjustment (enter previous crop) |
soybeans |
-27 |
| Prices:Enter Expected Corn Price ($/bushel) |
$4.85 |
|
| Enter Fertilizer Price ($/lb of N) |
$0.59 |
|
| Price Ratio Adjustment |
|
-11 |
| Total N Recommendation |
|
132 |
| Enter Starter N |
|
12 |
| Enter Manure N |
|
0 |
| Pre-plant Additional N Recommendation |
|
120 |
| Sidedress Additional N Recommendation |
|
96 |
Omafra P Recommenation Table for Corn
PHOSPHOROUS DEFICIENCY
TIP:
P deficiency is generally associated with early stages of corn growth and it will grow out of the purpling once the root system develops. But, early deficiency may reduce yield and/or delay maturity. Be sure there is enough early season P available.
| Soil Test P |
Phosphate (P2O5) Required |
| (ppm) |
(kg/ha) |
(lb/ac) |
| 0 - 3 |
110 |
99 |
| 4 - 5 |
100 |
90 |
| 6 - 7 |
90 |
81 |
| 8 - 9 |
70 |
63 |
| 10 - 12 |
50 |
45 |
| 13 - 15 |
20 |
18 |
| 16 - 20 |
20 |
18 |
| 21 - 30 |
20 |
18 |
| 31 - 60 |
0 |
0 |
| 61 + |
0 |
0 |
OMAFRA K Recommendation Table for Corn
POTASSIUM DEFICIENCY
TIP:
Be aware of K soil tests that have dropped over the last five years. Recent plot work has shown significant yield advantage to corn starter fertilizers that have some K in them, especially when soil tests are below 80 PPM.
| Soil Test K |
Potash (K2O) Required |
| (ppm) |
(kg/ha) |
(lb/ac) |
| 0 - 15 |
170 |
153 |
| 16 - 30 |
160 |
144 |
| 31 - 45 |
140 |
126 |
| 46 - 60 |
110 |
99 |
| 61 - 80 |
80 |
72 |
| 81 - 100 |
50 |
45 |
| 101 - 120 |
30 |
27 |
| 121 - 150 |
0 |
0 |
| 151 - 250 |
0 |
0 |
| 251 + |
0 |
0 |
|
