Foliar application fertilizers are particularly used to correct what type of deficiencies?

Foliar application fertilizers are particularly effective for correcting deficiencies in micronutrients. This method allows for the direct delivery of nutrients to the leaves of the plant, which can be beneficial when the soil may not provide sufficient amounts of these essential trace elements. Micronutrients, such as iron, manganese, zinc, and copper, are required in smaller quantities than macronutrients but are critical for various physiological functions in plants, including enzyme activation and photosynthesis. When a plant exhibits signs of micronutrient deficiency, foliar application can quickly supply the required nutrients, leading to a more immediate response than soil applications that may take longer to be absorbed and utilized by the plant.