How to manage the flowering date of jujube trees?

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How to manage the flowering date of jujube tree?

How to manage the flowering date of jujube trees? Is there any way to prevent falling flowers and fruits in the flowering period of jujube trees?

Step 1. Topdressing at the flowering stage

It is generally carried out in late May. The top dressing is mainly based on available nitrogen fertilizer and appropriate amount of phosphate fertilizer. Generally, 0.5 kg of urea and 0.5 kg of ammonium dihydrogen phosphate are applied to each fruit tree. After fertilization, water the flowers in time to loosen the soil and protect the soil from moisture.

Step two, open armor

Generally, it takes place when the jujube tree is in full bloom (first to mid-June) when the amount of flowering accounts for 30% to 50% of the total number of flower buds. The first nail-opening tree is carried out on the trunk at a distance of 20-30 cm from the ground, and then the nail-opening part moves up 5-10 cm every year. When the first main branch is reached, repeat the above operation, and the width of the nail mouth is generally 0.3-0.6 Cm is appropriate.

A strong tree with a wide width should be wide and weak trees should be narrow. When it is raining during flowering, it can be appropriately widened by 0.1 to 0.2 cm, but the maximum width should not exceed 1 cm. After opening the nail, attention should be paid to the protection of the nail mouth. Every 100 weeks, apply 100 to 200 times the liquid insecticide such as Lesiben to the nail mouth. Smooth the nail mouth with slow healing process, which is both insect-proof and moisturizing, which is beneficial to the healing of the nail mouth. Kaijia can also be used with the new technology to promote Huahua No. 2, the use period is when the jujube blooms about 20% for the first time, after 30 to 35 days, then use the second time.

Step three

From the middle of May to the end of June, the primary and secondary branches of the new jujube without backbone branches were topped in time to control the growth of the developing branches, reduce nutrient consumption, and increase the fruit setting rate. Generally, the new jujube head of the mature tree will be topped when it grows to 2 to 6 secondary branches, and the secondary branches will be topped as it grows. 3 to 4 secondary branches at the base of the jujube head will be topped when it grows to 5 to 7 nodes. 1 to 4 secondary branches grow to 3 to 5 knots when topping.

The degree of topping depends on the growth of the date head and the size of the space. Generally, the weak branches are topped, the strong branches are topped lightly, when the space is large, the tops are lightly removed, and the space is small. In addition to topping, the newly germinated and useless date head should be wiped off from the base as soon as possible to remove perennial branches with dense inner bores to save nutrients and facilitate ventilation and light transmission.

Step 4: Three sprays during flowering

One is spraying fertilizer, which is carried out during the flowering period of jujube, and continuous foliar spraying is applied 2 to 3 times every half a month with 0.3% urea + 0.1% to 0.3% potassium dihydrogen phosphate + 0.2% to 0.3% borax Mixed aqueous solution. Choose sunny morning or evening spray, especially in the evening. The amount of fertilizer sprayed is based on the wetness of the leaves. If spraying after rain, it should be re-sprayed in time.

The second is to spray water, choose when the blooming period of 60% of the flowers are blooming, the best time is in the evening, use a sprayer to spray clean water evenly on the jujube flowers, with water soaking the leaves as the degree. The number of water sprays depends on the degree of drought. In normal years, spray every 3 to 5 days, continuous spray 2 to 3 times, and in severe drought years, spray 3 to 5 times;

The third is to spray plant growth regulators, from the early flowering stage to the full blooming stage of jujube trees, choose to spray 15-20 mg/liter gibberellin solution or 15-20 mg/liter naphthalene acetic acid or sodium naphthalene acetate diluent on sunny days or evenings or 5～10mg/L of 2,4-D 1-2 times, spraying 30～60mg/L of acetic acid or 30mg/L of 2,4-D twice during the young fruit period (interval of 20 days), can be effective Prevent it from falling flowers and fruits.

Step 5: Prevention of diseases and insect pests

The diseases and insect pests that harm jujubes during flowering are mainly green blind stink bugs, beetles, red spiders, peach borers, jujube steppers, and jujube rust diseases.

Before and after wheat harvest is the best time to control red spiders, you can spray 1% acaricide 5,000 times or 15% mite-cleaning emulsifiable concentrate 2500 times.

Mid-May and mid-June are the critical periods for controlling the second generation of green blind stink bugs. Spray 1-2 times of 20% chlorsulfuron 2000 times solution, or 20% cyanopentyl ester on the weeds and crops on and under the trees. 2000 times solution + 10% imidacloprid 3000 times solution, also can hang black light lamp to trap adult insects.

In the first and middle of June, the peach worm insect trap was hung, and 5 to 7 days after the peach larvae attracted the moth, the speed of killing Ding 6000 times was sprayed in time.

Spray fungicide once in the middle of July and the middle of August (200-240 times the amount of Bordeaux solution and 50% carbendazim wettable powder 800 times solution, 70% methyl thiophanate wettable powder 1000 times alternately) Prevent date rust and fruit diseases.

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