If seedlings show signs of nutrient deficiency during the growing season, foliar spraying can be an effective way to boost their nutrition. This method involves applying liquid fertilizer directly onto the leaves, allowing plants to absorb nutrients through their stomata and epidermis. Foliar feeding can be done throughout the growing season, but it is most effective when applied to young leaves, which have a higher density of stomata and stronger physiological activity, making them more efficient at nutrient absorption.
The underside of the leaves typically lacks a cuticle and has more pores, which makes it easier for fertilizers to be absorbed. Therefore, it's important to spray both sides of the leaves to maximize effectiveness. The concentration of foliar sprays varies depending on the type of fertilizer used. For example, urea is generally applied at 0.2% to 0.5%, potassium dihydrogen phosphate at 0.3% to 0.5%, and superphosphate at 0.5% to 1%.
Potassium sulfate should be used at 0.05% to 0.1%, while ferrous sulfate is typically applied at 0.2% to 0.5%. Zinc sulfate is recommended at 0.5% to 1%, borax at 0.1% to 0.2%, and ammonium molybdate or sodium molybdate at 0.01%. Copper sulfate should be used at 0.01% to 0.02%, and manganese sulfate at 0.05% to 0.1%. It’s important to adjust the concentration based on the plant's needs and to avoid over-application, especially in mid-summer, to prevent leaf burn.
Foliar spraying is a quick and efficient way to correct nutrient deficiencies, especially when soil application is not sufficient or timely. It is particularly useful for providing micronutrients that may be unavailable in the soil due to pH imbalances or other factors. However, it should be used as a supplement rather than a replacement for regular soil fertilization. Always follow the manufacturer's instructions and conduct a small test before applying to large areas to ensure compatibility and safety.
Source: Henan Science and Technology News
Author: Li Cuiying
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