Pomegranate tree drop flowers and fruits of the reasons

Question 1: Pomegranate tree fruit drop causes Pomegranate flower and fruit drop what causes

Jinnong network 2004-6-14 agri

Transferred from agri

First, the flower and fruit drop causes

1, pistil abortion phenomenon is serious Pomegranate's floral morphology can be divided into 4 kinds of types: (1) pistil is higher than the stamen; (2) pistil equal to the stamen; (3) pistil below the stamen; degeneration 1/2-1/3; (4) pistil completely degraded. (3) the pistil is lower than the stamen, degraded 1/2-1/3; (4) the pistil is completely degraded. (1) (2) class of flowers ovary hypertrophy, is the main type of flower fruit, for the development of normal androgynophore complete flower, but it only accounted for 1/3 of the total amount of flowers, some varieties and even lower; (3) class of flowers are not many, if the tree nutrition is sufficient, this type of flower can develop into a complete flower; (4) flowers accounted for most of the total amount of flowers, some varieties of up to 90% or more. It can be seen that a large number of female abortive flowers is the main cause of a large number of physiological flower and fruit drop.

2, anther pollination and pistil acceptance of pollen time is short . Anther pollination is affected by temperature, light and other natural conditions, adequate light, suitable temperature is conducive to flowering and pollination. Pomegranate flowers open at 8:00-10:00 am every day the next day at 8:00 began to pollinate, a large number of pollen at 16:00 or so; with the rise in temperature, light enhancement, the day of the open flowers more than 18:00 pm before and after pollen, the next day has a large number of pollen at 8:00 pm, but after June 20, the temperature continues to rise, the light further enhancement, the amount of anther pollen instead of decreasing, and the color of pollen. Moreover, the color of pollen dispersed was dull, and the vitality of life was weakened. The ability of the pomegranate gynoecium stigma to accept pollen directly affects the fruiting rate of high and low, in the natural situation, pomegranate blossom before the day and the day and the next day pollination, can get a high rate of fruiting, and in the flowers open 3 days after pollination, the gynoecium stigma has been pushed to accept the ability of pollen.

3, pre-flowering less insects Although pomegranate has the ability of autoflowering, but the fruiting rate is not high, and isopollen can significantly improve the fruiting rate.

Second, flower and fruit preservation measures

1, improve the quality of flowers. The key is to become a flower time and the nutritional status of the flower bud differentiation period. During the first two batches of flower differentiation, increased fertilization, extra-root fertilization during flowering, to promote the differentiation of flower buds, the proportion of improved, and beneficial to the quality of flower buds.

2, create pollination conditions . When building the garden, while highlighting the main varieties, should be configured with more than three varieties as pollination trees, the ratio is generally 6:4 or so appropriate.

Where there is a bee source, put bees in the pomegranate garden before flowering, using bee swarms to assist pollination, however, the flowering period should be less sprayed and not spray pesticides.

Artificial auxiliary pollination, female complete flowers and failed flowers of pollen are available. Pick the pollen of the day of the defeat of the flowers (pollen grains bright yellow), remove the calyx and petals, reveal the stamens, directly point in the complete flower stigma, complete flower is about to open or just put immediately point in the pollination, because at this time the stigma is fresh, the ability to accept pollen is strong.

3. Thinning buds and fruits. Starting from the buds can be distinguished from complete flowers and failed flowers, to the end of the flowering period continuously, remove 70% of the failed buds; cluster inflorescences in only one terminal complete flowers, the rest of all removed; double fruit, multi-fruit only stay a fruit, in order to focus on nutrients, to improve the rate of fruiting and the weight of a single fruit to improve the yield and quality of the fruit.

4, the application of growth regulators used to hold the sprayer to open the full flower of the receptacle part of the spray 5-10 ml / liter of gibberellin, 5-20 ml / liter of the sodium salt of 2,4-D, flowering *** spray 2-3 times. Excerpted from "Yuncheng Daily"

Question 2: how to prevent pomegranate tree fruit drop Pomegranate tree fruit drop control methods: every autumn after the fall of the leaves, deep application of organic fertilizer, pre-flowering watering, timely control of pests and diseases. Pomegranate tree, a fruit tree native to the western region, through the Silk Road to the Central Plains, pomegranate is one of the public's favorite fruits, high nutritional value, pomegranate tree is also one of the trees planted by people ornamental. Tree height 2~4 meters, thickness 10~30 centimeters, pomegranate main places of origin such as Shaanxi, Jiangsu, Anhui, Zhejiang, Beijing and so on, greening pomegranate flowers, pomegranates, fruit pomegranate places of origin such as Jiangsu and so on. Pomegranate tree posture is beautiful, the flowering period up to several months, every year in May and June flowers bloom, brilliant as clouds, flowers red like fire, exceptionally bright, can be described as a set of edible and ornamental in one, coupled with the pomegranate adaptability, disease resistance, cultivation is easy.

Control methods: (1) strengthen the cultivation management, improve the pomegranate tree tree disease resistance; (2) clean pomegranate tree orchard, winter pruning will be combined with diseased branches, rotten fruit, etc. clean; summer to remove the disease at any time to fall fruit, buried or burned; (3) pay attention to the protection of pomegranate tree tree to prevent freezing or injuries, can be coated with the new high-fat film powder to protect; (4) to the pomegranate tree fruit bag; (5) scrape off Branch and stem spots and will be buried deep, painted to protect; (6) pharmaceutical control, early spring spray 3-5 ° stone sulfide, May-August spray 1:1:160 Bordeaux solution, every 15-20 days to spray 1 time

Problem three: pomegranate tree can not hang flowers how to do Pomegranate to improve the fruiting rate of the main points of the measures:

A pomegranate drop flowers and fruits:

1, due to fertilizer foot

1, due to sufficient fertilizer and water, the nutrients accumulated by the tree are not enough, the proportion of fruit flowers is not high, and there are many empty flowers, resulting in blossom drop;

2, the cultivation and management of sloppy, fertilizer and water can't keep up with the tree, the tree is weakened, and there is no timely supplementation of nutrients before and after the flowers, resulting in blossom drop;

3, the rainy weather during the blossom period affects the activities of the insect, and the pollination of pomegranate fertilizer is not good, resulting in blossom drop;

4, the period of the formation of the young fruits Fruit drop caused by low temperature.

Second, to improve the pomegranate tree fruiting rate of measures:

1, control the tree's growth, regulate the growth of branches and results of the contradiction: for the growth of the tree, you can take the root breaks, centrifugal, twisting, taking branches, pulling the branch, etc. to promote the differentiation of flower buds, so that it flowers and fruits.

2, strengthen the fertilizer management: autumn good fruit fertilizer, increase the application of organic fertilizer, enhance the tree, bud period to strengthen the fertilizer management, improve the nutritional status of the tree, improve the proportion of normal flowers. The young prosperous tree less or no nitrogen fertilizer.

3, artificial removal of empty flowers: in the bud just appeared to be able to distinguish whether it is a normal flower (buds for the gourd-shaped), commonly known as "brother flower", remove the degenerative flowers, commonly known as "girl flowers", pay special attention to the removal of the fruiting branches of the top of the degenerative flowers below the normal flower buds and flowers, all of the degenerative flowers of the flowering branches, retracted to the strong parts, to save the tree nutrients, improve the fruiting rate.

4, spraying micronutrients: spray boron fertilizer (0.2% to 0.3% borax) or amino acid foliar fertilizer 500 to 600 times during the flowering period, which can effectively reduce blossom and fruit drop. Young fruit spray 0.2% ~ 0.3% of potassium dihydrogen phosphate and other foliar fertilizers, can enhance the ability of young fruits to prevent freezing, to reduce the fruit drop caused by spring cold has a great role.

5, cut the crown of the useless new branches: spring buds in time to cut the crown of the useless new branches to reduce the consumption of nutrients, to reduce the fall of flowers and fruits. The useless new branches of the cut, to do with the hair with the cut.

Problem four: pomegranate tree fight oxidation fruit drop can be control methods:

① planted in the courtyard, roadside pomegranate spacing should not be too dense, should be kept ventilated, light penetration, planting should be full of basal fertilizer before planting. Growing period should always watering fertilizer, in order to promote vigorous plant growth, improve its resistance to disease.

② local conditions, choose the local and disease-resistant varieties for planting.

③ Ground or potted pomegranate, can be combined with the winter clearing garden, will be completely removed from the diseased leaves and dead branches, and centralized burned, to keep the courtyard and potting soil clean, reduce the next year's disease infiltration source.

④ agent control. During the onset of the disease, you can spray 50% carbendazim 800 to 1000 times liquid, or 70% metribuzin 1000 times liquid for control.

Pomegranate to improve the fruiting rate of measures:

First, pomegranate drop flowers and fruits:

1, due to fertilizer enough, the tree body has not accumulated enough nutrients, the proportion of fruiting flowers is not high, the empty flower is more, resulting in the fall of flowers;

2, cultivation and management of rough, fertilizer and water to keep up with the weakness of the tree, the pre-flowering flowers are not timely after the supplementation of nutrients, resulting in the fall of flowers and fruits;

3, during the flowering period, the tree body has not accumulated enough nutrients.

Second, improve the pomegranate tree fruiting rate of measures:

2, strengthen the fertilization management: autumn good fruit fertilizer, increase the application of organic fertilizers, enhance the tree, bud period to strengthen the fertilization management, improve the nutritional status of the tree, improve the proportion of normal flowers. The young prosperous tree less or no nitrogen fertilizer.

Problem five: pomegranate easy to fall off after the results, that is to say, hanging fruit not long enough to fall down pomegranate to improve the fruiting rate of the measures to point:

A pomegranate falling flowers and fruits:

1, because of the fertilizer enough, the tree body has not accumulated enough nutrients, the results of the flower is not a high proportion of flowers, empty flowers, resulting in the fall of flowers;

2, cultivation and management of rough, fertilizer and water can not keep up with the weak tree, before and after flowering did not timely replenish the tree.

2, sloppy cultivation management, fertilizer and water can not keep up, the tree is weak, before and after the flower did not supplement the nutrients in a timely manner, resulting in blossom and fruit drop;

3, the flowering of cloudy and rainy weather, affecting the activities of insects, pomegranate pollination fertilization is poor, resulting in blossom and fruit drop;

4, the formation of young fruits meets the cold temperatures caused by the fruit drop.

Second, improve the pomegranate tree fruiting rate of measures:

Problem six: pomegranate tree only flowering, can not sit fruit how to do? First, the reasons for flower and fruit drop

1, pistil abortion phenomenon is serious pomegranate organ morphology can be roughly divided into 4 our type: (1) pistil higher than the stamens; (2) pistil equal to the stamens; (3) pistil lower than the stamens, degradation of 1/2-1/3; (4) pistil completely degraded. (1) (2) class of flowers ovary hypertrophy, is the main type of flower fruit, for the development of normal androgynophore complete flowers, but it only accounted for the total amount of flowers 1 / 3, some varieties even lower; (3) class of flowers are not many, if the tree nutrition is sufficient, this type of flowers can be developed into a complete flower; (4) flowers accounted for most of the total amount of flowers, some varieties of up to 90% or more. It can be seen that a large number of female abortive flowers is the main cause of a large number of physiological flower and fruit drop.

For

2, anther pollination and pistil acceptance of pollen short anther pollination by the temperature, light and other natural conditions, light enough, the temperature is conducive to flowering pollination. Pomegranate flowers in the morning every day 8:00-10:00 when open the next day at 8:00 began to pollinate, a large number of pollen at 16:00 or so; with the rise in temperature, light enhancement, the day of the opening of the flowers more than 18:00 when around the pollen, the next day has a large number of pollen at 8:00, but after June 20, the temperature continues to rise, the light further enhancement, the amount of pollen dispersal of anthers instead of decreasing, and the color of pollen. Moreover, the color of pollen dispersed was dull, and the vitality of life was weakened. The ability of the pomegranate gynoecium stigma to accept pollen directly affects the fruiting rate of high and low, in the natural situation, pomegranate blossom the day before the day and the day and the next day of pollination, you can get a high rate of fruiting, and in the flowers open 3 days after pollination, the gynoecium stigma has been pushed to accept the ability of pollen.

3, pre-flowering less insects Although pomegranate has the ability of autoflowering, but the fruiting rate is not high, and isopollen can significantly improve the fruiting rate.

II. Measures for preserving flowers and fruits

1. Improve the quality of flowers: the key is the time of flower formation and the nutritional status of flower bud differentiation period. During the first two batches of flower differentiation, increased fertilization, extra-root fertilization during flowering, to promote flower bud differentiation, the proportion of improved, and beneficial to the quality of flower buds.

2, to create pollination conditions: when building the garden, while highlighting the main varieties, should be configured with more than three varieties as pollination trees, the ratio is generally about 6:4 appropriate. There is a bee source, before flowering in the pomegranate garden to release bees, the use of swarms of auxiliary pollination, however, the flowering period should be less spray and no spray pesticides.

3, bud thinning, fruit thinning: from the buds can be distinguished from the complete flower and the failure of the flower when the start, to the end of the flowering period in succession, remove 70% of the failure of the buds; cluster inflorescences to stay only a terminal complete flower, the rest of the removal of all; double fruit, multi-fruit to stay only a fruit to focus on nutrients, improve the rate of fruiting and the weight of the single fruit to improve the yield and quality of the fruit.

4, the application of growth regulators: used to hold the sprayer to open the full flower of the receptacle part of the spray 5-10 ml / liter of gibberellin, 5-20 ml / liter of the sodium salt of 2,4-D, flowering *** spray 2-3 times....

Question 7: Why does the pomegranate tree only blossom and not bear fruit The pomegranate tree only blossoms and does not bear fruit for the following four main reasons:

First, if there is no corresponding pollinator tree near the fruit tree, it is year after year only blossom and not bear fruit.

Second, late frost, wind or drug damage can cause flower and fruit drop.

Third, the tree storage nutrients are insufficient, poor development of flowering, so that the role of fertilization is blocked, or fertilized embryo starvation and death.

Fourth, some fruit tree varieties, nutrients are taken away by the new shoots, young fruits due to nutrient deficiency and shedding.

For the above reasons, the following measures can be taken to promote fruiting:

First, the self-flowering does not bear fruit or fruiting rate of low varieties must be equipped with pollination trees. General varieties and pollinated varieties of the ratio of 5 to 8: 1 if there is no place to replant pollinating trees. Can also be in the main varieties of high pollination varieties, or pollination varieties of flowering branches inserted into the water bottle, hanging in the main varieties of the canopy, or artificial pollination.

Second, in order to avoid late frost, available to delay the lifting of tree cold-proof things, tree disk mulching grass, irrigation, tree whitening and other methods to reduce the temperature of the tree and the ground temperature, in order to delay the flowering period.

Third, in order to avoid the occurrence of pests and diseases in the flowering period, to be sprayed in the budding Boomerang 3 to 5 degrees of stone sulfur Taiwan agent, to eliminate the pests and diseases in the flowering period before.

Fourth, strengthen the integrated management of fruit trees. 10 days before the flower irrigation - a thorough water, nitrogen fertilizer, to ensure that the flowering period and 10 days after the flowering of adequate water and fertilizer. The excessive weakness of the tree should be flowers and fruits all thinned out, recuperation tree.

Fifth, the growth of the tree is too strong, through centering, ring cutting and other summer shearing measures to control the growth of the nutrients can be more concentrated in the young fruit, to prevent shedding.

Sixth, flowering spray 0.3% borax plus 0.5% urea mixture can promote the germination of pollen grains, fertilized embryo nutrition is sufficient, conducive to the results.

Pomegranate tree:

Pomegranate tree, originating in the western region of a fruit tree, by the Silk Road to the Central Plains, pomegranate is one of the public's favorite fruits, high nutritive value, pomegranate tree is also one of the trees planted by the people ornamental. Tree height 2~4 meters, thickness 10~30 centimeters, pomegranate main places of origin such as Shaanxi, Jiangsu, Anhui, Zhejiang, Beijing and so on, greening pomegranate flowers, pomegranates, fruit pomegranate places of origin such as Jiangsu and so on. Pomegranate tree posture is beautiful, the flowering period up to several months, every year in May and June flowers bloom, brilliant as clouds, flowers red like fire, exceptionally bright, can be described as a set of edible and ornamental in one, coupled with the pomegranate adaptability, disease resistance, cultivation is easy.

Question eight: pomegranate tree does not fruit how to do? Pomegranate tree does not bear fruit causes and solutions:

The main reason for pomegranate tree does not bear fruit is still improper management. According to experience, into the fruiting period of the pomegranate tree but does not result in the following reasons:

1. insufficient light. Pomegranate is a light-loving plant, during its nutritive growth and flowering, insufficient light or cloudy and rainy weather will cause the pomegranate tree does not bear fruit. Insufficient light, will cause plant nutrient growth is relatively excessive, not conducive to the accumulation of nutrients in the body, thus affecting the reproductive growth, and thus the flowering immediately after the shedding; if the flowering of continuous rainy weather, will make the pistil can not be properly fertilized, resulting in the light of the flowering can not be fruit. 2. Nutritional mismatch. Pomegranate flowering period is very sensitive to water and nitrogen fertilizer, many people think that the pomegranate flowering period needs more water and nutrients, so a lot of fertilizer watering, resulting in pomegranate nutrient growth is too vigorous, resulting in a large number of drop flowers and fruits.

3. Degradation of the floral apparatus. Flower organ development and fruit growth are largely governed by nutritional status. Nutritional deficiencies make the flower organs of fruit trees underdeveloped, the formation of degraded flowers, deformed flowers, and shedding after flowering. 4. Branches dense exuberant growth. Pomegranate growth is fast, a year can draw two branches, dense branches and upright branches not only affect the ventilation and light, but also with the flowers and fruits to compete, affecting the fruit and reduce the quality, but also easy to make the pomegranate suffers from pests and diseases.

In response to the above problems, the main countermeasures for scientific management are as follows:

1. Pomegranate throughout the growing season to ensure that there is sufficient light, as long as there is no lack of moisture, pomegranate is not afraid of strong light.

2. Strengthen fertilizer management, phosphorus, potassium-based during the growth period, nitrogen fertilizer should not be applied more, to avoid branch and leaf prolongation to affect flowering and fruiting. In addition, in late autumn before the leaves did not fall before the end of a full of organic fertilizer and then dormant, to promote its next spring sprouting, twigs quickly and stout. It is best to plant with loose, airy, fertile sandy loam.

3. According to the pomegranate tree long flowering period, low fruiting rate characteristics, actively do a good job to protect flowers and fruits. Respectively in the pomegranate tree before flowering, young fruit period, fruit expansion period spraying foliar fertilizer, with melon and fruit strength spirit, to promote the pomegranate tree self-regulation of nutritional matching, strong, flower, fruit.

4. Early erase the excess buds, there is space available for the elongated branches to stay 50 cm centrifugal and twisted to the flat state; backbone branches upright, but also to take the method of bracing, pulling the backbone branches to open a certain angle, in order to maintain the balance of nutrient growth and reproductive growth. And take comprehensive and effective technical measures such as ring cutting, let it more fruit, fast fruit. After the ring cutting, timely application of Flowering King 2 (northern product), resulting in the transformation of the growth function of fruit trees to

reproductive function, activation and strengthening of the flower genes and the ovary of the floral apparatus, breeding a large number of high-quality flower buds and promote the differentiation of flowering, more flowers, more fruits, and stable production of high-quality for several years.

Question 9: What is the role of the pomegranate tree to visit the fallen flower article to the pomegranate tree to visit the fallen flower question The pomegranate tree has two kinds of flowers: bell-shaped flowers and tube-shaped flowers. Only the cylindrical flowers (with a big belly at the back) are fully flowered and capable of bearing fruit. The bell-shaped flower has only stamens and no pistil, so it will not bear fruit and will fall off when it opens, which is a normal phenomenon. In addition, if there are too many tubular flowers, the nutrient supply is insufficient, and some of them will also fall off. It is recommended to thin out the bell-shaped flowers at an early stage to save nutrients, which can improve the fruit set rate.

Question 10: the characteristics of pomegranate tree The tree height is generally 3 to 4 meters, can also be as high as 5 to 6 meters. The inter-root is prone to root tillers, which can be used to renew or divide and propagate, but under cultivation conditions, the root tillers are generally dug out, leaving a single trunk or multiple trunks to grow upright.

The branches of the pomegranate tree, generally weak and thin, axillary buds are obvious, the apex of the branch is needle-like, opposite; the apex of the elongated branches, sometimes whorled. The pomegranate tree has a lot of flowers, but the fruit drop is serious, the fruiting rate is very low, so the yield is unstable, the phenomenon of large and small years is heavier. According to Zaozhuang City, Shandong Province, Fengcheng survey: pomegranate trees are generally 15 years old or so into the fruiting season, plant yield 20 to 30 kg, the highest plant yield up to 50 to 100 kg.

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