Copper element fertilizer

If your plants complain of these symptoms, you can use this fertilizer: yellowing of the spaces between the main veins, and the modern leaves or leaf buds wilt or yellow, and the color of the veins is light green, which leads to the death of the tips. Copper sulfate fertilizer 30 grams. Method of use / a small teaspoon for every 3 liters of water when there is a deficiency, and it is applied monthly to complete the health of the plant.