How to prevent and cure the yellow leaves of flowers caused by acidic soil?

In view of the causes of leaf yellowing in acidic soil, the following three major control measures can be taken:

1. Increase the supply of soluble iron: soil and water is alkaline, and acidic chemical fertilizers such as ammonium sulfate can be mixed with 0.1% gypsum and sulfur powder, which is helpful to reduce alkalinity and improve the effectiveness of iron.

2. Increase the supply of magnesium: applying calcium magnesium phosphate fertilizer or spraying leaves with 0.1%-0.5% magnesium sulfate solution in acidic soil areas can make the leaves turn green.

3. Timely supply of nitrogen fertilizer: land-planted flowers apply sufficient organic fertilizer (cake fertilizer, garbage mud, etc.) in winter, and potted flowers apply 0.1%-0.2% solution of urea or ammonium sulfate in spring. In addition, ground flowers should be drained in time, potted flowers under the cushion drainage layer, pay attention to good soil ventilation.