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How to extend the shelf life of grapes
The harvested grapes are still living organisms as they grow on trees. The following measures can effectively prolong the storage period of grapes. One, timely harvesting grapes harvested too early or too late, are not resistant to storage, judging the indicators of fruit maturity, the most important thing is the sugar content of fruit juice, the general sugar content of fruit juice is 13% to 20 %, its sugar to acid ratio is 2.5:1 to 3.5:1. The grapes must not be watered before harvesting. To prevent threshing. It can be sprayed from 2000 to 4000mg/l for 15 to 45 days before harvesting, and sprayed with 16 to 100mg/l of Qingshui 15 days before harvest. 3 days before picking with 5 ~ 100mg / l naphthalene acetic acid plus 1mg / l gibberellin spray, but also can maintain fresh fruit stems do not fall. Grapes should be harvested in sunny and windy weather until morning dry. Use the left hand to pinch the ear and cut the stem with your right hand. Select a larger ear, moderate elasticity, a neat ear, full fruit, and a layer of fruit powder on the surface, no pests and mechanical wounds. Disinfection: Store with 1% baking soda or 5% borax after washing. Since garlic, onions, or anise, etc. contain fungicides, the onion garlic juice can be diluted with water and then dipped. In addition, the use of thiophanate-methyl, carbendazim and other agents dip fruit processing, the sterilization effect is also very ideal. Third, the storage method (1) bungalow storage Select a well-ventilated room, take a double shelf in the indoor, scoop grape code on the shelf, stacking height 30 ~ 40cm, the top cover paper dust. The indoor temperature is maintained at 0°C to 4°C, and the relative humidity is 80% to 90%. When the humidity is insufficient, water is poured and humidified to the ground. (2) The terracotta vats will store the selected grapes in a silicone rubber plastic bag, exposing the spikes and stems, and tie the vats tightly with a rope. Earthen jars for cylinders are placed in vacant rooms. The sorghum stalks or wooden slats in the cylinders are used as a 3-layer shelf, each layer being 30 cm apart. The packaged grapes are hung on the shelf with iron wire. There is a gap in the center of the rack to facilitate picking. Cylinder cover plastic film, not tie. Keep indoor 0 ~ 2 °C is appropriate. If the temperature drops, close the doors and windows and enclose the cylinder with straw. When the room temperature rises above 2°C, the windows are opened and the grapes are checked afterwards. (3) Digging trenches Store trenches in the north-south direction, with a length of 10m, a depth of 0.8m, a width of 1m, and a width of 0.3m. Ditch the bottom of 5cm sand, and then use 1% formalin (250ml 40% formalin solution plus water 10L stir) or 1.5% to 2% caustic soda solution, 10% bleach solution, set aside for a day and night , according to 250 ~ 300ml / cubic meter spray groove wall disinfection, after disinfection placed 3 layers of ear. Ditch to take a "person" shaped frame, cover the straw mat during the day, uncover it at night, when the ditch temperature is below 0 °C, cover the grass to prevent freezing. (Liu Lingzhi)
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