The Law of the Minimum
Plant growth is not set by the nutrient that is most plentiful, but limited by the one that is scarcest — like a barrel that can only hold water up to its shortest stave, however tall the others are.
The hidden short stave is often a secondary or micronutrient — silicon, calcium, magnesium, sulphur, iron, manganese, copper, zinc or boron — the ones most often overlooked, even though they decide the final yield.
Orthosilicic Acid⁺ Gold contains orthosilicic acid plus all 8 secondary and micronutrients in one product, and brings soil pH to the ideal range for crops.