The problem of fissure date has been plaguing the majority of jujube farmers, which has brought varying degrees of losses to the production of jujube, and in serious cases the losses have reached more than 50%. The cracked jujube problem is the most difficult problem to solve in the production of the jujube industry, and it should arouse the great attention of the majority of fruit industry scientists and juvenile farmers. Through many years of practice, the author has taken some measures according to the causes of cracked dates. Through the comprehensive application of these measures, we can effectively solve the cracking problem. First, the cause of cracking dates Causes The continuous application of chemical fertilizers and drought caused soil compaction, and the lack of soluble calcium absorbed by the roots of the jujube tree in the soil caused cracking dates. The history of chemical fertilizer application in China has been more than 30 years, and the amount used has been increasing year by year. Its types are mainly ammonium bicarbonate, superphosphate, diammonium phosphate, ammonium sulfate, potassium sulfate, and potassium chloride. After applying this type of chemical fertilizer in soil, the carbonate ions, phosphate ions, sulfate ions, and chloride ions in the chemical fertilizer combine with the calcium ions in the soil to form water-insoluble calcium carbonate, calcium phosphate, and calcium sulfate. Calcium chloride reduces soluble calcium in the soil and causes calcium deficiency. At present, soils in most parts of China, especially in northern arid regions, are deficient in calcium. Soil drought is one of the causes of calcium deficiency. When the soil is dry, it is not conducive to the activity of soil microorganisms. Most of the calcium elements that are fixed in the soil must be metabolized by microorganisms to become soluble calcium. Reason 2 The groundwater level is reduced, and the soil is not evenly distributed due to dry and wet soil. Before the 1970s, there was basically no cracking phenomenon, mainly because the water table was high at that time. Even if it did not rain or water, jujube tree roots were not short of water and did not cause uneven soil moisture. Second, measures to prevent cracking dates According to the two reasons for the occurrence of fissures, we should take practical measures from the activation of calcium in the soil, calcium supplement on the foliage, and maintenance of soil moisture to fundamentally prevent fissures. 1. The orchard grass cover covers 10-20 cm thick stalks in the concentrated distribution area of ​​the roots. Density planted higher pure jujube garden can be covered by the whole park. Grass cover time is good from June to October. At this time, grass-covering temperature and high humidity are conducive to the large-scale propagation of microorganisms in the soil and are conducive to the activation of calcium in the soil. In the autumn, the root growth time can be extended. Summer and winter can be Reducing the temperature difference in the soil is conducive to the growth of the root system, especially the growth of the surface roots. Covering the grass can keep the soil moisture well and keep the soil moisture in balance, thus preventing the occurrence of cracked dates. Long-term grass mulching will significantly increase the organic matter content in the soil. Wheat straw, wheat bran, and crushed corn stalk can be selected. 2. Plastic film covering tree plates Before jujube germination, generally, the mulching membranes covering the width of 1 to 2 meters on both sides of the tree can maintain the soil moisture, so that the soil will not be too dry and can effectively prevent cracking. 3. Using hole storage and fertilizer technology, dig 4 holes with diameters of 30-40 cm and depths of 40-50 cm inside the vertical projection of the fruit tree, and embed a straw of 20-30 cm in diameter and 30-40 cm in length in each hole. The grass is made of straw or weeds of various crops and is 10 cm below the ground. It is soaked with water and then put into the hole. The grass is filled with soil mixed with biological fertilizer and organic fertilizer, and then it is filled with water. Filled, the hole above the cover of 1 square meters in size, surrounded by earth pressure, insert a hole in between, usually sealed with stones to prevent evaporation of water. Due to the large amount of water and rainwater that can be stored in the hole, the water can be preserved in the deep layer, so that part of the root system maintains sufficient moisture to prevent cracking. 4. Leaf calcium. The author used Ryan calcium plus Kampei 2 plus love more to receive, in the flowering period, young fruit, fruit expansion period, the middle growth period and the growth of the post-spray once, a total of 5 times, after 3 years of use to prove that can effectively prevent The occurrence of fissure dates. If the above four technologies are used together, the effect of preventing cracking dates will be better. Lactobacillus Acidophilus,Lactobacillus Acidophilus Powder,Lactobacillus Acidophilus Probiotic,Lactobacillus Acidophilus Supplements Jiangsu Biodep Biotechnology Co. ,Ltd. , https://www.mbioda.com