First, the top dressing before flowering In late April to early May, according to each jujube tree with urea 0.4 ~ 0.6 kg, 1.5 ~ 2 kg of superphosphate, 0.6 kg of potassium chloride, open the hole after pouring water. It can also use 10 to 15 kg of decomposed human excrement and 4 to 6 kg of vegetation ash for each jujube tree, and apply it to the water after pouring. 2. In the month before flowering, the pests were extirpated in March, and the wormwood was used to prevent and control adult worms of Zaozhi and Zaofei. In the middle and late April and late May, 3000 pesticides of pyrethroids were sprayed once. can. Third, before flowering, do not perform the backbone of the date of the jujube head, when the backbone of the emergence of 4 to 5 water secondary branches, according to the strengths and weaknesses, respectively, to leave 4 or 3 second branch topping. Due to the appearance of Zaotou is not the same, sooner or later, so picking the heart to be carried out in phases. Fourth, girdling during flowering period during florescence can temporarily interrupt the transportation of nutrients produced by the leaves to meet the early development of flowering fruit set and young fruit. The specific method is: on the trunk 10 to 20 cm high from the ground, cut twice with a sharp knife, incision width of 3 to 5 mm, deep to the xylem, take out the phloem, ask to peel without leaving residual skin, no hair, To heal. Afterwards, it will be carried out at an interval of 3 to 5 centimeters per year, and will be peeled back at the main branch. The girdling should be due to trees and should not be used for saplings and weak trees. After girdling, apply insecticide and apply paper or plastic film to prevent evaporation. V. Flower bloom during flowering According to the survey, during the flowering period, putting the bee in the jujube garden can increase fruit setting rate by about 1 time, and increase production by 20% to 30%. The closer the beehive is to the jujube tree, the higher the fruit set rate is. Six, flowering "three spray" (a) water spray. When the relative humidity of the jujube flower is lower than 60% during the flowering period, the nebulizer is evenly sprayed with water on the sprayer, sprayed once every six days, and sprayed three times. (b) spray fertilizer. In the early flowering stage and young fruit stage, the leaves can be sprayed with 0.3% to 0.5% urea and 0.1% to 0.3% potassium dihydrogen phosphate solution. Spraying should be done in cloudy weather, or in the morning and evening. The amount of fertilizer sprayed was the degree of wetting on the leaf surface. (c) Spraying hormones. Flowering stage sprays 10-15PPm naphthaleneacetate, or 5-10PPm 2,4-D on strong trees. The use of naphthalene acetic acid 30-60PPm, or 2,4-D 30PPm twice (with intervals of 20 days), can effectively prevent its falling. Spraying 0.2%-0.3% borax or boric acid during flowering can also effectively increase the fruit setting rate.
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