How do you harvest and store grapefruit (pomelo)?
What is the harvesting method for grapefruit (pomelo) and how do you store it well? Please give a detailed introduction. Grapefruit harvesting can refer to the following methods: Grapefruit harvesting can be based on fruit maturity to determine the suitable harvest time. Due to differences in climatic conditions among different cultivation regions, especially differences in temperature conditions, the fruit harvest period of grapefruit varies greatly...
What is the harvesting method for grapefruit (pomelo) and how do you store it well? Please give a detailed introduction.Grapefruit harvesting can refer to the following methods:
Grapefruit harvesting can be based on fruit maturity to determine the suitable harvest time. Due to differences in climatic conditions among different cultivation regions, especially differences in temperature conditions, the fruit harvest period of grapefruit varies greatly. The same variety can reach harvest standard in October in tropical regions, while in the mid-subtropical region it may not reach the minimum quality standard until April of the following year. The harvest standard for fruit intended for storage is that 2/3 of the peel has turned yellow and the juice sacs are plump.
The suitable harvest time can also be determined based on fruit maturity. Due to differences in climatic conditions among different cultivation regions, especially differences in temperature conditions, the fruit harvest period of grapefruit varies greatly. The same variety can reach harvest standard in October in tropical regions, while in the mid-subtropical region it may not reach the minimum quality standard until April of the following year.
The harvest standard for fruit intended for storage is that 2/3 of the peel has turned yellow and the juice sacs are plump and full, but the fruit has not yet softened. Therefore, when growing grapefruit in different climatic zones, the suitable harvest time for different varieties should be determined according to the main indicators for measuring grapefruit maturity.
Fruit for harvest and storage is harvested successively in late November, and harvesting is completed by mid-December at the latest. Avoid injury during harvesting. After harvesting, ventilate and allow water loss for 2 to 3 days, put on plastic bags 0.03 mm thick, pack immediately into boxes, place in a cool, ventilated place for storage and then ship successively, and it can be stored until April at the latest. Precooling may be harmful to early-maturing grapefruit and can cause serious peel damage. Avoid hydrocooling, because hydrocooling may increase peel damage.
Grapefruit storage can refer to the following methods:
Treating grapefruit with 20% to 40% high carbon dioxide before storage can inhibit chilling injury during storage at 0°C. Treating with 20% carbon dioxide for 14 days can also reduce the pitting rate of grapefruit peel stored at 4.5°C for 8 weeks and 12 weeks.
Single-fruit packaging of grapefruit with shrink film can also reduce chilling injury. Coating with vegetable oil or vegetable oil-water emulsion can significantly delay the occurrence of chilling injury during storage at 3°C and reduce chilling injury symptoms. For grapefruit treated at 34.5°C, fruit that is individually packaged, waxed or kept at 95% relative humidity has significantly less blue mold rot during subsequent cold storage than fruit treated at low humidity.
Freshly harvested grapefruit conditioned at 17°C for 5 days can reduce subsequent chilling injury during storage at 0°C. Treating grapefruit with saturated steam at 43°C for 25 minutes can kill all Caribbean fruit fly larvae that have penetrated into the fruit. Sometimes marketing requires degreening of the peel, under conditions of 28 to 30°C, 90% to 96% relative humidity, with 1 to 5 mg/L ethylene added in the room, and the treatment time is 1 to 3 days. Natural degreening also occurs during storage.
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