There are many new buds in the cash cow, but what can be done?

Sulfur-deficient young leaves turn yellow from veins until all leaves turn yellow. The prevention method of sulfur deficiency and iron deficiency root can be sprayed with 0.30% ferrous sulfate aqueous solution for three times continuously, with an interval of 1 week. When spraying, the fog point should be fine and uniform. At the same time, 0.20% urea-iron aqueous solution can be used for root topdressing.