Jujube trees have a large amount of flowers, but they have serious fruit drop and fruit setting. From 1998 to 2000, the author conducted experiments to improve the fruit-setting rate of jujube trees in several pieces of tablets in Leling, Texas. Through several years of experimental investigation, the author summarized the following measures for reference applications of farmers. Tuna Loin,Frozen Tuna Loin,Fresh Tuna Loin,Yellowfin Tuna Loin ZHEJIANG RETRONX FOODSTUFF INDUSTRY CO.,LTD , https://www.retronxfoods.com
1. Strengthen soil fertilizer management.
Deep fertilization is used to fertilize the trees in front of the jujube tree to the projection of the tree crown. The soil can be turned and the soil can be used for soil fertigation to increase the nutrient level.
Fertilizer spray from the flowering period to the young fruit period every two months, continuous spraying two or three times 0.1% urea and 0.3% potassium dihydrogen phosphate mixture, spraying 0.1% ~ 0.3% borax.
Pollen grains do not germinate at drought during the spray period, resulting in poor pollination. In the flowering period, appropriate amounts of water can be sprayed three consecutive times every one day to two days. Spraying water is before 10:00 a.m. and evening (10:00 am to 3:00 pm, pollen is pollen. Sprinkle time should not be sprayed) It is advisable that each tree spray 10 kg, can increase the fruit setting rate of 12% to 35%; spraying a small amount of urea when the effect is better, generally adding 300 grams to 500 grams of urea per kilogram of water.
2, do a good job summer pruning.
In the early stage of full bloom (30% to 40% of the flower volume), the opener first scrapes the rough trunk of the tree, and then carries out the song girdling (opening). In the first year, the ring is cut off from the ground by 20 cm to 30 cm. The girdling width is 0.3 cm to 0.5 cm. The strong trees should be wide and the weak trees should be narrow. When the armor is opened, the rough skin is scraped first, and then the phloem is cut with an open knife to reach the xylem without damaging the xylem. When cutting, the knife is inclined downward and the knife is inclined upward. The skin is required to be peeled without leaving residual skin and no hairs. After peeling off the applicator protection, apply once a week, the other 2 to 3 times, use plastic sheeting to protect the wound and promote wound healing. The next year, 3 cm to 5 cm above it can continue girdling until the first main branch.
After the buds of the jujube sprouted in early May, the new jujube heads that sprouted at one side of each level and the resulting branches, if not extended branches and result branches, should be removed from the base to save nutrients and enhance tree vigor.
Topping the heart is an effective measure to control growth and save nutrient consumption. After application, it can significantly increase the fruit setting rate and require the Zaotou (first branch) and the second branch to pick up the heart at the same time. Otherwise, the effect is not obvious, and the picking of the heart should not be too early or too late. Generally, In early June, the jujube flower was opened to the fruit setting period. When the new tip of the upright, non-spatial jujube head grows to 25 cm to 30 cm, it will be picked up. The vigorously growing jujube head will leave 3 to 4 branches 2 times to pick the heart. The weak will stay 2 One to three branches 2 times, 2 branches left 6 to 7 topping.
The sparse and pull branches are sparse on the dense branches that are affected by the ventilation and light penetration of dense branches and stem branches; in the late June, the upright and topping dates are pulled horizontally.
3. Use growth regulators.
In the first two weeks of flowering (late May), when the jujube grows to 8 leaves, spray 0.1% PP333 or 0.2% to 0.4% of B9; spray 10-1510-6 at the early stage of blooming. Su, or 0.2% ~ 0.3% borax, potassium sulfate, etc.; can also be sprayed during the flowering period 5 ~ 1010-6 2,4 - D, after the flower spray 30 ~ 6010-6 of 2,4 ~ D; The spraying of the above several growth regulators can significantly improve the fruit setting rate of jujube trees.
4, in addition, the jujube garden bees, etc. can also improve the fruit set rate of jujube.