Question 2: Why do black dates planted for nine years only blossom but not bear fruit? You need to improve control. The trunk can be girdled at flowering stage, and boron fertilizer can be applied to the whole plant, especially flowers, to promote pollination and fruit setting. ..
Question 3: There is a black date in the yard, why not? Generally speaking, black dates begin to bear fruit in about 5-6 years. It blooms in May and ripens in June, 5438+ 10.
Question 4: Why don't black dates bear fruit? The possible reasons for the fruitlessness of black jujube are: 1, the age of the tree is less than 5 years (immature in its infancy); 2, poor management (last summer and autumn, pest control was not timely, resulting in leaves falling off in advance, or eaten up by pests, insufficient nutrition stored in the tree, poor or undifferentiated flower buds, so there are no flowers this year); 3. The age of the tree is small (about 4-5 years), the tree is too vigorous, and the flowers and fruits drop seriously (cutting the trunk around at flowering stage can improve the fruit setting rate).
Question 5: My family has a black jujube, which has only been in operation for more than ten years. You need to improve control. The trunk can be girdled at the flowering stage, and boron fertilizer can be applied to the whole plant, especially the flowers, to promote pollination and fruit setting.
Question 6: Can the trees planted with black jujube stones bear fruit? There are many factors for jujube trees to blossom and not bear fruit. Most varieties of jujube can bear fruit by self-pollination, but cross-pollination is the best. In particular, some varieties have poor stamen development and pollen degeneration, which must be coordinated by pollinating tree species. The pollination and pollen germination of jujube trees are affected by natural conditions, such as low temperature, drought, windy and rainy weather, which is not conducive to pollination. It may also be caused by excessive growth of jujube trees, imbalance between vegetative growth and reproductive growth, and improper fertilization. It can be adjusted by pruning, which is easier than other fruit trees. There are imitation vertebral shape, open shape and pagoda shape, that is, hollowing out the middle, and not too many branches and leaves in the middle.
Ring-cutting the bark of jujube trees is called nailing, which can solve the problem of only flowering but not bearing fruit.
People cut down jujube trees, also called jujube trees, in order to regulate the nutrition of trees. For jujube trees with vigorous growth, the phloem is cut off by opening nails, so that the nutrients made by leaves can supply the nutrients needed for flowering and fruit setting. Specifically, for fruit trees with the age of 12 ~ 15, when they are in full bloom, the bark around the trunk is cut with a knife.
"Nail opening" refers to annular peeling. The opening of jujube trees can inhibit vegetative growth and promote reproductive growth, thus improving the fruit setting rate of jujube trees. According to experiments, the yield of jujube trees can be increased by about 40% after a nail is opened. But if the armor is not to the purpose, the result will be counterproductive. Jujube trees should pay attention to the following seven points:
1). The cycle should be accurate. Practice has proved that it is most suitable to open nails when jujube trees are nearly half-blooming. It is difficult to bear fruit when nailing jujube flowers too early; It is too late to open the carapace, and too much nutrients are transported downwards, which reduces the nutrients needed for the growth of jujube fruit.
2). The age of the tree should be appropriate. Generally, jujube trees can be opened after entering the full fruit period. However, jujube trees under 7 years old or with trunk diameter less than 10 cm should not be opened. Because premature nail opening will lead to crown atrophy and shorten the life of jujube trees.
3). Be careful when opening armor. For newly opened jujube trees, first, peel off the old bark about 2 cm wide from the ground, so that the tender bark is exposed, and then cut it twice with a knife to cut off the tender bark 0.5 cm wide, so that the phloem deep into the xylem can be cut off without damaging the xylem cambium. The knife edge of the nail mouth is inclined downward, and the knife edge of the lower knife is inclined upward, so that the whole nail mouth becomes a ladder groove shape.
4). The width of the nail mouth should be appropriate. According to the experiment, the effect of increasing production is the best when the nail mouth is healed in about 25 days. Therefore, if the nail mouth heals early, it is necessary to cut off the healing place around the nail mouth with iron wire to delay the healing time; If the nail mouth heals late, it should be washed and fertilized to accelerate the nail mouth healing. Generally, the width of nail mouth is 0.5- 1cm, and the flourishing trees should be wide and the weak trees should be narrow.
5). Opening should be advanced year by year. The first nail opening should be carried out 30 cm from the ground, and then it will be moved up 3-5 cm year by year. When the nail mouth opens to the main branch, it should be opened again from the base of the trunk.
6). The wound should be protected. In order to prevent the water in the nail mouth from rotting and infecting bacteria, the jujube tree should use wet mud Tu Ping mixed with insect repellent after opening the nail mouth to prevent the harm of ants and insects and help the wound heal.
7). Keep up with water and fertilizer. Jujube trees bloom every year, and the fruit setting rate increases, which is easy to weaken the tree potential; Therefore, it is necessary to combine comprehensive management measures such as fertilization, irrigation and prevention of metallurgical diseases in order to maintain vigorous tree vigor and increase yield. If it is found that the tree is weak and the leaves are white, it needs to be stopped for 2-3 years, and then it will be opened after the tree is restored.
Question 7: My family has planted black dates for four years, but they only blossom without fruit. Why? If you know it, please let me know. Thank you! Maybe it's malnutrition Water more and fertilize more! ! ! ! ! ! ! ! ! ! ! !
Question 8: The characteristics of black jujube, scientific name: Junqianzi, a deciduous tree of persimmon family, with a height of 30 meters and a DBH of 1.3 meters; The crown is nearly spherical or oblate; Bark is grayish black or grayish brown; Branchlets brown or brown; The shoots are usually light gray and sometimes purplish. Winter buds are brown. The leaves are oval to oblong, the top is dark green and shiny, and the bottom is green or pink green and pilose; Petiole is sometimes pubescent with grooves on it. Male flowers axillary; Calyx campanulate; Corolla can-shaped, reddish or yellowish. The fruit is nearly spherical or oval, light yellow when it is first ripe, then blue-black, usually with a thin white wax layer, 8 cells; Seeds oblong, brown, laterally compressed. Flowering in May, fruiting period 10- 1 1.
Junqianzi is strong in nature, likes light, bears semi-shade, cold, drought and water. I like fertile and deep soil, which is more barren-resistant and has a certain salt-alkali tolerance. It can grow normally in mild saline-alkali soil with pH value of 8.7 and salt content of 0. 17%. Longer life, shallow root system, but developed root system, slow growth three years before transplantation, rapid growth three years later. Strong resistance to sulfur dioxide.
Junqianzi is an excellent rootstock for persimmon grafting.
Question 9: Why do my black dates only blossom but not bear fruit? It has grown for six years. Can you send a picture of the grafted branches of persimmon trees and the ground where flowers are spent every year? Black dates seem dioecious. If it is a male flower, it will not bear fruit. The male flowers are red and the female flowers are yellow and white.