Since the beginning of spring, northern China, especially Shanxi and Hebei provinces and regions, have suffered from unsustainable droughts for many years. In recent days, the temperatures in Beijing, Hebei, and Henan have reached 37°C and the continuous high temperatures have aggravated the drought in our province. Jujube flowering and young fruit development require a certain temperature and humidity. The optimum temperature is 23°C to 26°C. Temperatures above 27°C or below 20°C will affect the development of flowering fruit set and young fruit. The suitable ambient humidity is 70% to 80%. The weather is dry, the air is too dry, and the relative humidity is lower than 40% to 50%, which not only affects fruit setting but also severely affects young fruit development. At present, Jinsi jujube in our province is entering the young fruit period; winter jujube is passing from the end of full bloom to the young fruit period. Sustained high temperatures, droughts, and windy weather caused the jujube tree to be a flowery phenomenon in the previous period. Even if the use of fruit setting agents is increased, the fruit setting in many areas is still not ideal, especially in Dongzao! Now, the drought is seriously affecting the growth and development of jujube trees. In general, the jujube trees are wilting and yellow, and serious people begin to fall off. The leaves of winter jujube are seriously curled and wilted, and yellowing and shedding are also present. The jujube fruit is also being processed. Weakness, yellowing, and fruit drop are very serious. In view of the current extreme drought conditions, the following suggestions are proposed for the management of current jujube trees: Spraying water in small amounts on a canopy in the evening or in the morning in a timely manner can both clean the dust and reduce the temperature. It can also control the leaf respiration and increase nutrient accumulation. , enhance drought resistance. It is also possible to use pesticides in combination or indirectly spray water with regulators that prevent fruit drop and promote swelling. Watering has entered the young fruit of the jujube, jujube garden water source conditions can take time to water once after using the regulator to prevent fruit drop, promote swelling regulator. In the near future, the jujube gardens that have not used the above-mentioned regulators or have recently used gibberellin should not be watered prematurely to prevent fruit drop. For irrigation, the following conditions can be taken: 1. Drip irrigation. Drip irrigation can save 60% ~ 70%, but also to avoid the ground water damage to the soil structure. 2. Infiltration. Pod irrigation can be implemented. The method is to dig 8 to 12 caves outside the tree tray, about 30 cm deep, and fill it with water, so that it can slowly infiltrate the soil so as to achieve the purpose of saving water and resist drought; it can also use the technology of infiltration of buried tanks. The method is suitable for arid and dry water in the jujube garden. The specific approach is: The results park each tree bury 3 to 4 mud pots, tank mouth higher than the ground, the spring irrigation water per tank 10 to 15 kg, cover the tank mouth with a cover. The water in the tank can infiltrate outwards for the growth and development of the fruit trees; after the rainy season comes, too much water in the soil can be leaked from the outside into the tank, reducing the soil moisture and creating a more suitable soil environment for the growth and development of jujube trees. . This method is simple and easy, you can refer to the trial. 3. Covering the grass. Covering the ground with grass can prevent large amounts of water from evaporating and the soil moisture content can be increased by about 45%. All localities can choose wheat straw, green manure, weeds, etc. to cover them according to local conditions. The thickness should be 7-10 cm. The best time to cover is watering, cultivating and then grass mulching. The average amount of grass used is 1,500 kg. 4. Promote film watering. The conditional jujube garden can cover all the mulch in the jujube garden, and then apply a certain number of small holes on the membrane and water it on the membrane. The jujube garden lacking in water can only be covered with a tree plate and then watered according to the above method. Moisture absorption agent is a type of polypropylene, absorbent, highly water-retaining, its water absorption capacity is more than 1000 times its own weight, and has excellent water retention performance, in the dry environment, the surface can form a resistance film, prevent moisture in the film Spill and evaporation. According to relevant information, if 100 grams of moisture absorbent is applied within a square meter, the moisture in the soil will increase by 800 times and the evaporation of soil moisture will decrease by 75%. By using this feature of the moisture absorbent, it is possible to retain the water for a long period of time after the water or rain in the date garden has been provided, so that the fruit trees can be absorbed and applied for a relatively long period of time. In addition, because it has the characteristics of water swelling, dehydration and shrinkage cycle, it can also increase soil porosity, prevent soil compaction, and further improve the growth and development environment of jujube roots. The use of anti-transpiration agent to apply anti-transpiration agent can reduce the transpiration of fruit trees, and to a certain extent, improve the utilization of water. At present, the chemical control of water consumption has attracted more and more attention. An ideal anti-transpiration agent can not only promote the growth and development of plants, but also can close the stomata to a certain extent, reduce transpiration, and has the dual effects of open source and throttling. In recent years, it has been found that fulvic acid has such characteristics, the application of fulvic acid in fruit trees, valid for more than 18 days, can significantly reduce transpiration and increase water potential, and leaf temperature has not been significantly affected. Spraying in the early stages will significantly improve the body's moisture status. Spraying aspirin with aspirin (salicylic acid) also has better results. The method is to spray 10 to 15 pieces of medical aspirin and 50 to 100 kilograms of water to the whole tree. Spraying “drought land dragons†to spray “dry land dragons†can reduce stomata and reduce leaf transpiration. The method is to spray 500 to 600 times the dryland dragon. Spraying certain chemical fertilizers or trace fertilizers In the case of large droughts, spraying about two to three 0.2% potassium dihydrogen phosphate aqueous solutions or more than 1,500 times borax aqueous solutions can effectively reduce the transpiration loss of the leaves and increase the temperature resistance. Drought ability. Do not spray more nitrogen fertilizer.
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