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, to strengthen the prevention and control of pests and diseases Prevention and control of pests focus on disease prevention, mainly Zao rust, anthrax, spotted deciduous disease, and prone to ringworm, soft rot, black spot and other diseases before the winter date. Insect pests are mainly red spider, peach borer, and leaf roller moth. The prevention and control of diseases and insect pests of winter jujube should comply with the "Comprehensive Technology for Non-polluted Production of Winter Jujube" using pollution-free pesticides. For disease parks that have already occurred, early removal of the rot fruits on the trees, picking up dead fruits from the ground, sweeping off the diseased leaves and fallen leaves on the ground, and reducing the mutual infestation of pathogens.
Second, weeding loose soil, timely protection According to the status of weeds and soil moisture, timely weeding, soil moisture, soil moisture in the jujube garden is poor, but also need timely watering to avoid jujube fruit loss; appropriate Soil moisture is the key to preventing fruit cracking. Soil moisture content is poor and watering occurs in time. Water will not appear cracked fruit. Soil cover film and grass cover will protect against burns caused by drought in white maturation period and prevent fruit from coloring. Penetrates into the flesh, causing 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 the tree potential Winter dates need 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.
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