In September, the jujube entered the rapid growth period before fruit ripening, and matured one after another. This period is the critical period for determining fruit quality. In this period, the temperature and the daytime difference are conducive to the normal development of the jujube fruit, especially the accumulation of dry matter such as sugar; the larger the day difference, the more complete the coloring of winter jujube and the better the quality; precipitation is the main meteorological factor affecting the quality of winter jujube. Precipitation is too much, the disease resistance of the fruit is reduced, susceptibility to black spot disease, anthrax ring rot, brown rot, etc. Fruits can easily cause fruit cracking, resulting in deterioration of quality or severe reduction of yield. First, strengthen pest control. Disease and pest control work focuses on disease prevention, mainly jujube rust, anthracnose, spotted deciduous disease, as well as ring rot, soft rot, and black spot disease that are prone to occur before harvest of winter jujube. Second, weeding soil, timely protection. According to the condition of weeds and soil moisture, timely weeding and ridiculousness, maintaining the soil moisture, and soil in the soil of the jujube garden with poor water quality, also need timely watering to avoid jujube wilting and losing water; suitable soil moisture is the key to prevent cracking. Poor soil watering in time, watering will not appear cracked fruit; soil cover film, grass cover protection, can prevent the maturation period caused by drought caused by burning marks, to avoid fruit coloring period rain from the wound into the pulp, resulting in cracking. From early September until harvesting, a 300 mg/L calcium chloride solution is sprayed every 10-20 days to prevent cracking. Third, a reasonable top-dressing, increase tree vigor. Late winter jujube needs more fertilizer, it is necessary to pay close attention to fertilizer. Fertilizer varieties are dominated by phosphorus and potash fertilizers, and at the same time, some nitrogen fertilizers are also applied on plots with weak tree vigor and poor soil fertility. The amount of fertilization varies from place to place. Generally, about 0.5 pound of urea is applied to each tree. Fertilizer can be sprayed with 0.3% urea plus 55% potassium dihydrogen phosphate to increase the photosynthetic efficiency of the later leaves, which is beneficial to the nutrient accumulation of the tree. Carbon Molecular Sieve,Cms Carbon Molecular Sieve,Carbon Molecular Sieve For Nitrogen Generator,Carbon Sieve Hangzhou Zhongju air separation equipment manufacturing Co., Ltd , https://www.hzzjkfzz.com