It may be that the root system is waterlogged and rotted, or holes appear, which leads to the dry and atrophy of the root system, and the root system is planted too deeply to inhibit the root system respiration, so that the root system can not absorb nutrients and water from the soil, the trees are dehydrated, and the tree potential is weakened.

Specific measures:

Dig a hole around the soil ball and gradually check the root system. If root rot is found, cut off the rotten root with a hand saw, cut out new tissue, spray the root with Zhi Yong and Ji He (30% ethylicin), and then apply Kuaihuolin Guachuang ointment to seal the wound; Then backfill the soil to cover the roots. After one day, it can be watered with the rooting solution of the happy forest and all beings, disinfected and sterilized to promote rooting. If a cavity is found, it should be filled and compacted in time and then backfilled, and the thickness of the covering soil is not easy to be too thick.