What causes yellowing leaves in clivia (Clivia miniata)?

First, the potting soil is too wet or too dry: too wet causes root rot, and too dry causes the roots to shrivel, weakening their ability to absorb, so the supply of water and nutrients is insufficient, which causes the leaves to turn yellow; second, direct strong sunlight in summer; third, damage from pests and diseases; fourth, leaf replacement, that is, every spring and autumn when the clivia puts out new shoots, there is always a batch of

Third, the leaves of three- to four-year-old plants turn yellow, wither, die and drop off, which is normal metabolism.