|Plot Size:||15’ x 265’|
Soil Test Values (ppm)
|Yield Goal:||175 bu|
|Target Fertilizer Rate:||192-90-48|
To determine the optimum time for fertilizing a corn crop with potassium.
Agro-Culture Liquid Fertilizer’s Sure-K is seed safe to allow application of the required nutrients in-furrow when planting. Sometimes the question of when to apply potassium, if not with the planter, comes up. In determining to answer that question, a broadcast rate of Sure-K was applied in the fall. A comparison of fall broadcasted Potash was also applied. Both treatments were incorporated into the soil by chisel plowing the previous corn crop residue. The spring broadcast treatment of Sure-K was made and incorporated with a soil finisher before planting. Yield results appear in the table below.
- The 4 gal/A rate of Sure-K gave nearly identical yields as the higher rate of Sure-K broadcasted or the dry Potash applications. The in-furrow placement puts nutrients where they are needed.
- Planter applied, fall or spring broadcast of potassium had no significant yield advantage to each other. The difference comes in the amount of nutrients applied to realize similar yields.
- In spite of these results, broadcast applications are not recommended at this time until more research is conducted.
- The no planter fertilizer treatment lacked the necessary nutrients needed to accomplish its yield potential.
- If Sure-K is going to be broadcast applied, a 20% increase in rate is needed to achieve comparable yields to planter applied rates.