What are the symptoms and prevention methods of iron deficiency in flowers?

Symptoms: the plant grows relatively low, and the leaves at the top appear yellowing or whitening; the young leaves at the top of the plant are yellowing and albino, and the growing point and young leaves are even scorched; the upper leaves of the plant are almost white or milky white, and the lower leaves are mostly brown. Control methods: mixed application of organic manure or green manure with sulfur powder, ploughing into the soil to reduce the soil PH value; application of 0.2% ferrous sulfate solution for 2-3 times, each time at an interval of 7 days.