The calcium is an element involved inthe cell division. It improves the cell wall strength, which is essential for the fruitsetting. The calcium is less mobile in the plant.
The magnesium is a key component of chlorophyll andconsequently, it supports the photosynthesis. Its role
on the yield is very important. The magnesium is rathermobile in the plant. Any deficiency is observable on the older leaves first.
As building block of some amino-acids, thesulphur plays a direct role in the protein setting. It’s also a component of the chlorophyll and its action on growth and yield is important.