Causes and Countermeasures of Fruit Cracking in Jinsixiaozao

Most jujube varieties often have fruit cracks of different degrees during the ripening period, and fruit cracking occurs in the brittle ripening period where the peel begins to turn reddish to completely red. The dehiscence of jujubes in the skin is not only poor in appearance, but also easily causes pulp decay, resulting in greater economic losses. The causes of cracking and the control measures are described below:

First, the main cause of cracking

1. It is related to high temperature and drought. In the jujube area of ​​northern China, the jujube fruit is in the white mature stage from mid-August to early September. In this period, in case of drought, in the case of high temperature and high transpiration at that time, the water lost from the fruit could not be replenished in time and it would cause the peel to burn on a daily basis. This kind of unhealed tiny wound, when it encounters the rain or the nighttime condensation, the rain that stays on the fruit surface for a long time will permeate into the flesh through the daily burn mouth, causing the flesh cells to swell and expand to a certain extent. At that time, the skin will have bulge centered on the daily burn hole. Practice has proved that the early end of the rainy season, in mid-August to early September, there will be fruit cracking in different degrees in the drought year.

2. It is related to the management habits of jujube farmers. The current fertilization of jujube farmers is mainly applied in the whole garden, and the fertilizer application site is shallow, causing the roots of the jujube tree to turn up. Now the roots of most jujube orchards are distributed in soil layers of 0 to 20 cm. In case of drought, it is impossible to guarantee sufficient water supply to the jujube tree root system, and also to the absorption of nutrients by the root system, so that the above-mentioned causes are prone to occur and cause cracking. Practice has shown that the jujube garden with or without fertilization has a deep root system, and the soil moisture distribution in the root system is small, and the cracking fruit is light or not cracked.

Second, prevention and control measures

1. Select crack resistant varieties.

2. Irrigate with drought. It is required that water should be timely irrigated during the ripening period of the fruit to ensure that the water content in the 0-40 cm soil layer is maintained at 14% or above, and when it is insufficient, the irrigation water is added.

3. To date grass cover.

4. To change the existing fertilization methods, use the ditch or acupuncture to guide the jujube roots to grow deep.

5. The timely application of boron and calcium, enhance the thickness and hardness of the peel, can prevent the occurrence of cracking.

6. Spray the therapeutic bactericide in time after cracking to reduce the occurrence of pulp rot. Practice has proved that the timely spraying of DuPont Fuxing 8000 times 1 or 2 times, can effectively reduce the occurrence of rot fruit after cracking.

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