Prevent the fruit cracking of most varieties of jujube in the mature period, and the loss caused by the cracking of the fruit often accounts for 10% to 30% of the jujube output. Fruit cracking usually occurs in the crisp ripe period when the fruit starts to color and turn red to completely red, and it is mostly the fruit formed by the early flowers of the middle-maturing variety that starts to color in the middle of September. Early-maturing, mid-late-maturing varieties that mature before the beginning of September, late-maturing varieties that mature in October, and mid-maturing varieties have very little fruit cracking in late flower formation. The years where fruit cracking occurs are the years when the rainy season ends early and there is drought from mid-August to early September. The end of the rainy season is late, and in the years with drought from mid-August to early September, even the varieties that are prone to cracking rarely crack or even crack.
The main measures to prevent fruit cracking: â‘ Choose and plant good varieties that are resistant to fruit cracking, which is the fundamental measure to solve the problem of fruit cracking; â‘¡From late July, spray 3 g/kg calcium chloride aqueous solution every 15 days until harvest, or In mid-to-late August, the fruit surface is sprayed with 50-100 times the lime water solution; â‘¢In the case of drought and irrigation from early August to early September, the soil water content is stably maintained at 12% to 14%, which can be covered by film, grass or straw The method reduces the evaporation of water under the canopy, and timely drains water to prevent waterlogging, so that the soil water content remains stable, which can greatly reduce the cracking rate; â‘£The varieties that are prone to cracking can be harvested and processed in time during the white maturity period to avoid losses caused by cracking.
Preventing Fruit Drops Before Picking After jujubes begin to color, the phenomenon of fruit dropping before picking often occurs, which is called fruit dropping before picking.
Spray anti-falling element application of 10-20 mg/kg concentration of anti-falling element (ie chlorophenoxy acetic acid) also has a good effect on preventing jujube falling before harvest.
After ripening and harvesting and spraying plant growth regulators such as naphthalene acetic acid, the harvesting period of the jujube will be delayed appropriately, and the fruit stalk will be branched, which will increase the difficulty of harvesting. If this happens, the harvest time can be postponed appropriately or 200 mg/kg of ethephon can be sprayed once to accelerate the harvest.
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