Dataset on the Phenological Survey of Grape Germplasm Resources in Hebei Province

The survey method referred to the "Grape Germplasm Resource Description Specification and Data Standards", and regular on-site investigations were conducted on all germplasm resources in the resource garden during the bleeding period, fuzz period, green sprouting period, leaf expansion period, inflorescence visibility period, bud separation period, initial flowering period, peak flowering period, final flowering period, fruit setting period, color transformation period, and maturity period.

The evaluation criteria for each developmental stage are as follows: Injury flow period: the period when sap flows out from the pruning site. Fluffy stage: The period when buds swell and brown fuzz is visible. Cute green period: Sprout eyes see green tips. Leaf expansion period: the period when the first leaf extends and unfolds. Inflorescence visible: the inflorescence is clearly visible. Flower bud separation: The period when the inflorescence fully elongates and the flower buds separate. Initial flowering period: the period when 5% of the flower cap falls off. Full bloom period: the period when 50% of the flower cap falls off. Late flowering period: the period when 80% of the flower cap falls off. Fruit setting period: The period when young fruits begin to swell and residual flowers completely fall off. Color transition period: The period when colored fruits begin to soften or appear lighter in color, and colorless varieties begin to soften. Maturity period: The period when grape fruit development reaches the stage suitable for harvesting and consumption.