Do I need a starter fertilizer for corn if the soil test is high in P and K?
On soils testing high for P and K, we have not been able to demonstrate a need for starter fertilizer containing these elements. In general, Ohio soils warm up early enough in the spring that there is adequate release of these nutrients, and thus good early growth of seedlings results even without the use of starter P and K. Nevertheless, research data from Wisconsin has shown that on soils that tend to be cold and wet during early spring, the use of starter P and K can be of benefit, even when the soil test levels of P and K are high. In northern Ohio where seedling growth is sometimes delayed by cool, wet conditions, starter P and K may also be of some benefit. In addition, on high clay content lakebed soils, there has been found to be a much higher efficiency of K, which is placed in the row, as compared to broadcast applications. 9. If P and K are high (and a starter fertilizer is not needed), how do I get the starter N in? There are several pure nitrogen sources that can be used a
