Why do fruits develop black heart and hollow problems?

The fruits may appear beautiful on the outside, but when cut open, they have black heart (without any foul odor). This condition is generally associated with a deficiency of mineral nutrients such as calcium, potassium, and boron during the fruit's growth period. Although there is no foul odor, it is not advisable to consume such fruits. 

The affected fruits cannot be restored. Here are some actions you can take to reduce the occurrence of black heart in fruits. Firstly, you can apply an appropriate amount of fertilizer based on the plant's needs during its growth stages to ensure sufficient nutrient uptake. Secondly, you may pay particular attention to supplementing calcium and potassium fertilizer during the fruit expansion period and later stages of fruit growth. Additionally, you may also spray Mr Ganick 8 in 1 Plant Energizer once a week to supplement calcium and other micronutrients and promote plant health.