First, the cause of apple's “shoulder†cracking is heavy. During the later period of apple growth, when the pulp cells continue to expand, if the temperature drops at that time, the peel will shrink, while the pulp cells that are still expanding will spread the peel. Cause cracks in the skin. Apple's "shoulder," because the skin is tender, so heavy cracks.
Second, the reasons for the severe cracking of apple stems are not timely or the apple harvesting is not timely, and the cracks will be aggravated. If the apples are pulled, they will not be harvested within 7 days after bag removal. More than 20% of apples will crack.
In addition, there are many rainfalls. If there is dew every day and the fruit surface is not dry before 11 a.m., the humidity in the ground is large and the temperature is unstable. The apple orchard with partial nitrogen fertilizer in July to August will make the apple crack heavy.
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