Chloride is an essential micronutrient. Tables 1 and 2 show the most recent research results. Cl Deficiency Symptoms. Most varieties do not show the leaf spotting, but do exhibit consistent yield response when soil Cl levels are low. Potassium chloride or muriate of potash is the most readily available form of Cl-containing fertilizer.
Potassium chloride is a dry granular material that can be mixed with dry N materials.
Liquid forms of Cl are also available. Magnesium chloride can be blended with UAN solutions for producers in a liquid program. Research has shown that Cl can be applied preplant, at planting or topdressed with equal effectiveness.