Over 15 years of consistent results has proven Nutri-Cal to be the best calcium source. Today, Nutri-Cal is sold all over the world on and used on almost every crop grown. There are several physiological disorders that are related to calcium deficiencies. Soft fruit may also be attributed to low fruit calcium levels. Much of the calcium in your soil is tied-up in an insoluble compound and is unavailable to be absorbed by plant roots.
Calcium only moves into the fruit during a short period of time.
The cell division phase. The calcium ion is very immobile within the plant. Calcium only moves upward in the plant from the roots through the xylem vessel by way of the water transpiration stream. Since the leaves have a larger surface to volume ratio than the fruit, leaves transpire more water and therefore most of the calcium goes to the leaves and never reaches the fruit. Fruit cell tissue become critically deficient of calcium allowing for breakdown of the cell wall.