Do not use fertilizers containing chlorine. Potassium chloride is usually used as a base fertilizer and can also be used as a top dressing, but it is not suitable for seed fertilizer. Fertilizer used on peonies should be used for flowering plants. What I see in the surrounding bases The discarded fertilizer bags are water soluble molar fertilizers, which should be good. They have been using them for a long time.
Chlorine-free crops include tobacco, potatoes and sweets. potatoes, sugarcane, watermelon, grapes, citrus fruits, apples, tea, cabbage, peppers, lettuce, amaranth, etc. are all chlorine resistant crops.