Proper development of fruits and storage roots are dependent on a constant soil supply of calcium. Deficiency in tomato is characterized as blossom end rot. Calcium deficiency is hard to detect with plant analysis or soil testing, because it is usually caused by low soil water uptake by the plant. The Ca may be in the soil but it is not being taken up. Several enzymes include copper in their structure.
Copper is also part of several compounds important in photosynthesis.
Deficiency shows as deformed tops in younger plant tissue of broadleaf plants. Flowering is reduced and ovules are often aborted. Magnesium Magnesium is the central element within the chlorophyll molecule. The yellowing is usually interveinal initially. Later on, the leaf margins can appear similar to potassium deficiency.