
Banding P fertilizer has been a recommended practice for a long time in corn production, but sometimes we forget just how good banding P fertilizer is when compared to a broadcast application. Past research using radioactive phosphorus fertilizer has shown the difference in plant uptake between band and broadcast applications of P fertilizer for corn production. In this research project, the corn tissue was tested during the growing season to determine the percentage of the phosphorus in the corn plants that came from the radioactive phosphorus fertilizer applied. The table shows the band rate of 20 lb/a had the highest amount of uptake in the corn tissue at all three tissue sampling times. This was compared to a 40 lb/a and 80 lb/a broadcast rate of P2O5. Even late in the season, the 20 lb/a band rate was equal to the 80 lb/a broadcast rate for the amount of phosphorus that came into the plant from the fertilizer rates applied (broadcast rate 4 times higher than the band rate). While everyone knows that banding 20 lb/a of P will not keep up with crop removal, it is important to recognize the efficiency of banding P fertilizer. Higher rates of P will need to be applied over time to account for crop removal in the rotation. There are very good reasons why banding P fertilizer for corn production is becoming more common across the Midwest. With advances in tillage equipment and GPS technology, banding P fertilizer for corn production in the fall or the spring may become as common as the Minnesota Twins winning the World Series. (We can only hope!)
| P rate and Placement |
Early season tissue sample |
Mild season tissue sample |
Late season tissue sample |
|---|---|---|---|
| P2O5 lb/a | %P from fertilizer | %P from fertilizer | %P from fertilizer |
| 20 lb/a Band |
23.8% | 13.4% | 11.9% |
| 40 lb/a Broadcast |
2.8% | 5.1% | 8.6% |
| 80 lb/a Broadcast |
4.4% | 7.5% | 11.8% |