During Spring, the growing point of corn is actually coming up above the surface. This is a key stage where the actual kernel row numbers around the ear are being determined. These next few stages will begin the rapid growth stage where the corn will really take off prior to the reproductive and tasseling process. It's critical that all the nutrients that are needed for this corn crop are out in the field at this point. If there's anything it's deficient in, now is the time to go out and remedy that before it's too late.