Too much phosphate reduces available zinc, sulfur, calcium, magnesium and manganese. Calcium is regarded as the most important of all nutrients. Too much calcium, especially above 80%, reduces available magnesium, potassium and most micronutrients.
Too much magnesium reduces the uptake of potassium and calcium due to compaction. Too much potassium blocks boron, calcium and magnesium. Soil potassium in excess of 7.5% creates weed problems.
Not enough sulfur causes fruits to dry out more readily, too much can result in rot. The plant utilizes boron therefore enough soil boron needs to be present. Boron is not mobile in the plant so foliar feeding is a good idea.
