Persimmons are not straight and empty. What happened?

The occurrence of hollow fruit is caused by many physiological reasons, such as too high concentration of 1, insufficient nutrition, too much nitrogen fertilizer, insufficient light or too high night temperature (night temperature 15~ 18 degrees). Prevention and control methods should avoid partial application of nitrogen fertilizer, pay attention to the coordinated application of nitrogen, phosphorus and potassium fertilizer, widen the temperature difference between day and night, supplement trace elements in leaves in time and increase flower bud differentiation.