There are situations in which you simply need to enhance specific nutrient availability, or perhaps take greater control over challenges that you may be facing. These challenges may initiate with environmental stress, the stress stemming from achieving a higher than usual fruit set, or perhaps even from a nutrient deficiency.
Calcium is especially essential when growing vegetables, and there are many instances when the soil may have adequate levels of this important nutrient, but the plant is unable to obtain sufficient quantities in a given period of time. This can be seen with issues such as blossom end rot, or poor fruit storage quality. To avoid these costly situations, it usually makes sense to supplement calcium throughout the production season. MetaCal 10-0-0-10Ca is an excellent choice.
NC237 and NC164 are specific nitrogen/calcium blends encompassing not only nutrient, but in addition carry some disease protection components as well.