First, pre-harvest factors
1. The same winter jujube variety has early and late-maturing strains. The early-maturing strains began to turn red fruit before September 25. The late-maturing strains began to turn red fruit after October 5. It is best to choose late-maturing strains for long-term storage.
2. The best cultivation method is to choose a dwarf cultivation winter jujube garden so as to facilitate manual picking, reduce mechanical damage, and increase the number of winter jujube with fruit stems.
3. Diseases and Insect Pests should be collected in the jujube garden with good pest control and no weeds or weeds. Because the winter date with pests and diseases easily accelerates its softening and storage of mold during the latter.
4. Irrigation and Rainfall Jujube over-drenching will result in excessive softness when jujube harvesting, which will reduce the intact fruit crispness during storage. Therefore, proper irrigation is necessary to improve the rate of intact fruit and jujube, but the rain will increase the fruit cracking and excessive wet damage during storage. Therefore, it is necessary to harvest the dried jujube after the rain stopped, and remove the cracked fruit into the storage.
5. Pre-harvest calcium spraying Spraying 0.5% CaCl2 to jujube tree before and 30 days before harvest can obviously maintain the hardness of jujube fruit in storage, and can increase the good fruit rate. Therefore, pre-harvest calcium injection can be used as an auxiliary measure to improve the storage and preservation of winter jujube.
Second, harvest classification
1. During the harvesting period, the early winter jujube was extremely resistant to storage and the mid- and late-stage winter jujube was relatively resistant to storage. Therefore, in order to prolong the storage period and increase the perfect crispiness rate of winter jujube, it is better to use the jujube harvested in the middle and late period for storage.
2, mature maturity, red, slightly red, semi-red, mostly red, red and other maturity of different winter dates. After 90 days of storage, the intact crisp rate differed by 10%-25% between each maturity. Therefore, if we want to improve the rate of intact and crisp fruit, prolong the storage period, and obtain good economic benefits, it is very important to store in strict accordance with the maturity after sorting. In general, long-term storage of jujube to choose white, red, half red and half red fruit into storage, and under the tree in the field.
3. The harvesting method must be hand-picking when harvesting, and can not be harvested by hitting or rocking with a wooden stick, or can be harvested by using ethephon-assisted shedding, so as to avoid mechanical injury or hormone ripening and affecting storage. effect.
4. Selection and selection can be performed simultaneously with maturity sorting. It is required to remove the branches and leaves and pick out the winter jujube with diseases and pests, deformities, small heads, and maturity less than white.
5, classification includes maturity rating and size rating. Short-term storage (2 months or less) can be divided into 3 maturity levels: full red, most red, half red and below; medium and long term storage (more than 2 months), choose half red, half red, Reddish and white mature winter jujube.
Recommended reading: http://user.zgny.com.cn/emember_advanced/1/emember_advanced_cpzs.asp?mbrId=474232&TypeId=38057
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