A: There are several cases of poor coloration of grapes, such as excessive coloration, no coloration, and slow coloration. Grape coloring is mainly caused by excessive light or bagging errors. The most basic reason for the lack of coloration or slow coloring is the low number of leaves, low leaf-fruit ratio, insufficient leaf area, ageing leaves, lack of light, lack of photosynthetic nutrition, or improper selection of cultivation areas, low sunshine hours or rainy days. Many days; may also be the reason for cultivation techniques, such as soil fertilizer management is not in place, improper plastic trim. Many people use the coloring of grapes as a sign of whether they are mature or not. This method of judgment is not correct. Judging whether the grapes are ripe or not should be based on the sugar content of the grapes.
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