Calcium can be supplemented before and after flowering and during fruit expansion, once every 7- 10 days, together with boron, which is beneficial to calcium absorption. At the same time, nitrogen fertilizer should not be applied unilaterally, but should be used in combination with phosphorus and potassium fertilizer.

(When growing peppers here, calcium, magnesium, phosphorus, calcium superphosphate, etc. Adding base fertilizer or soil can reduce navel rot of pepper caused by calcium deficiency, which is rarely seen here. )