Foliar fertilizers are mostly completely soluble in water, and generally contain Nitrogen,
Phosphorus, and Potassium (N-P-K). The other lesser, but important ingredients of a plant
fertilizer may include minerals such as calcium, magnesium, copper, zinc, iron, boron, etc.
However, some products combine fertilizer with an herbicide or insecticide.
Because of their excellent water solubility, both macronutrients (carbon, hydrogen, oxygen,
nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur) and micronutrients (boron,
chlorine, manganese, iron, zinc, copper, and molybdenum) can be delivered to plants by
foliar spray.
However, since macronutrients are required by plants in much higher amounts, they are
preferably . . .
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