Maturity Sings of Sweet Potato:

1. They are harvested 3.5 to 4 months after planting. 
2. Leaves start yellowing 
3. After cutting the tuber if white gum remains white, then they are ready for harvest , it it turns blackish on green then tubers are said to be immature.

Harvesting of Sweet Potato:

The crop is harvested by digging with spade or kudali.

Source : agriinfo

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