How to cultivate red dates to grow big and red? The flowering period is enclosed. When about 60% ~ 70% of the inflorescences hanging from the whole jujube tree are open to the outside world, scrape off the thick skin 30cm away from the road on the trunk with a scraper, and the width is about 3cm. Then, in the area where the thick skin is scraped off, peel off the tight 0.3 cm ~ 0.6 cm epidermis around the trunk with a knife until it reaches the phloem, which is called girdling.

After the girdling of jujube trees, the safe passage for transporting nutrients in phloem mechanism is cut off, so that the photosynthetic products produced by leaves can not be transported downwards for the time being, and concentrate on a part of the trunk to supply petals and young fruits, which has the function of making jujube trees bear more dates. However, because girdling will weaken the growth potential of jujube trees, it is suitable for strong jujube trees, and weak branches are best not. At the same time, it is necessary to further strengthen the management means of water and fertilizer.

Sprinkle water when flowering. In northern China, it is dry and windy in spring. When jujube trees encounter manic temperature or dry and hot wind in the flowering season, the fragrance at the top of jujube style will be reduced, and there will be a lot of dust on the honey tray, which will hinder the pollination and fertilization of jujube flowers, and even make the anthers of jujube flowers dry up in serious cases. The top of the column withers and falls, which is also called "burnt flower".

At this time, if water is sprayed on the flowers, the fruit setting rate can be obviously improved. The specific method is to choose a windless temperature, spray clean water evenly on the branches with a sprayer before 8: 00 am or after 5: 00 noon, and spray it again every 1 ~ 2 days. Generally, 3kg of water is sprayed on each young tree.

External fertilization. Jujube trees must have a lot of nutrition when they are in full bloom and bearing fruit. If 0.5% urea solution is sprayed on the leaves at flowering stage and young fruit stage, the fruit setting rate can be significantly improved. Boron can promote the whole process of digestion and absorption of sugar by bee pollen, activate metabolism, stimulate the germination of bee pollen and the growth and development of pollen tubes, and improve the rate and efficiency of pollination and fertilization. Therefore, spraying 0.2% ~ 0.3% crushed sand or boric acid solution at flowering stage also has a significant effect on improving the fruit setting rate of jujube trees.

Spray naphthylacetic acid. Spraying 0.0005% sodium naphthylacetate aqueous solution or 0.00 1% sodium naphthylacetate aqueous solution at the full flowering stage of jujube trees can improve the fruit setting rate by about 20%. Spraying 0.003% sodium naphthylacetate solution for 2 or 4 days or 0.005% sodium naphthylacetate solution twice in the young fruit stage can prevent the young fruit from falling off.

Pick the top of jujube. Topping the 3 ~ 4 secondary branches (hair branches) left by the original jujube tree head (new shoots) in the middle and late May can concentrate the nutritional components and improve the fruit setting rate.