What is the reason for the fall of grapes when the summer black series of grapes are planted in gree

Let's go to 191 and ask everyone on the agricultural resources network, which has more than 130,000 registered members.

I know. There are several reasons, and I don't know which one yours is.

1. Dry in summer and excessive water loss.

2. There is a pest called Xumei.

3. I didn't do a good job when planting.

Summary. Hello dear, happy to answer for you. There are two main categories of grapes that do not bloom.

The first type is the flower bud problem, the flower buds of the vine are differentiated from the previous winter, and they bloom this year, if the flower buds of the previous year are poorly differentiated, it will lead to the grapes not blooming this year. The fruit trees of the previous year consumed too much nutrients, such as leaving too many fruits, and the yield was too high, resulting in insufficient nutrients in the tree body, which could not promote the differentiation of flower buds, resulting in no flowering this year; or too dense when planting, resulting in underdeveloped roots, weak branches, and insufficient nutrient growth of flower buds, resulting in fruit trees not flowering; In the previous year, ethephon was used to promote fruit coloring, which delayed the harvest time and did not store enough nutrients in the tree, resulting in poor flower bud differentiation. The second type is caused by improper management, the branch growth is too vigorous, the reproductive growth is weak, and the vegetative reproduction is strong, so the fruit tree is not easy to flower.

What is the reason why the greenhouse summer black grapes are not very good this year?

What is the situation when the flower buds are not full.

Hello dear, happy to answer for you. There are two main categories of grapes that do not bloom. The first type is the flower bud problem, the flower buds of the vine are differentiated from the previous winter, and they bloom this year, if the flower buds of the previous year are poorly differentiated, it will lead to the grapes not blooming this year.

The fruit trees of the previous year consumed too much nutrients, such as leaving too many fruits, and the yield was too high, resulting in insufficient nutrients in the tree body, which could not promote the differentiation of flower buds, resulting in no flowering this year; or too dense when planting, resulting in underdeveloped roots, weak branches, and insufficient flower buds to grow, resulting in fruit trees not flowering; In the previous year, ethephon was used to promote fruit coloring, which led to a delay in harvesting, and the tree did not store enough nutrients, resulting in poor flower bud differentiation. The second type is caused by improper management, the branch growth is too vigorous, the reproductive growth is weak, and the vegetative reproduction is strong, so the fruit tree is not easy to flower.

The lack of flowering and fruiting of the vines may be caused by a lack of light, so it is necessary to give more than 6 hours of light a day to allow the flower buds to differentiate smoothly. It can also be caused by a lack of pruning, so it is necessary to prune off the dense foliage in time to allow the canopy to have good ventilation. The lack of nutrients will also cause the vines to have difficulty in fruiting, so it is necessary to apply more phosphorus and potassium fertilizers to supplement nutrients during the flowering and fruiting period.

1. Insufficient light grapes are suitable for growing in a place with sufficient light, and when maintaining grapes, it is necessary to give more than 6 hours of natural light every day. Therefore, it is necessary to ensure that the grapes are cultivated with sufficient light so that they can bear fruit smoothly. 2. Poor pruning During the growth of grapes, proper pruning is required to make them bear fruit smoothly, and if there is no pruning, the vines will not be able to flower.

Therefore, the vines need to be pruned 1 3 times a year to remove the branches that are too dense and those that are not growing well, so as to increase the fruiting rate of the vines. 3. Lack of nutrients Lack of nutrients during the growth of grapes will also lead to the failure of vines to flower and fruit, at this time can be watered into the soil once diluted organic fertilizer to supplement nutrients, in addition to the flowering and fruiting period of the vines, it is necessary to apply more phosphorus and potassium fertilizer, less nitrogen fertilizer, so that the vines can bear fruit smoothly. 4. Improper watering Grapevines are suitable for growing in a moist hidden bend environment, but they are not resistant to waterlogging.

If there is water in the soil during the maintenance of the vines, or the roots are too dry, the vines will not be able to flower, so when maintaining the vines, it is necessary to water according to the dryness of the soil to ensure that the soil is in a slightly moist state.

Generally mature in mid to late July, depending on the place, cultivation method, climate of the year, the greenhouse should be early, and the Jiangsu and Zhejiang regions are generally mature around July 20.

Summer black grapes, an early-maturing seedless variety, cultivated in the open field, take 100 to 120 days from bud break to fruit ripening. Greenhouse planting, under the condition of controlling moisture and temperature, germinates about 30 days early, and matures about 30 days earlier than open field cultivation.

Summer black grapes, also known as summer black seedless, oriental black pearl. Native to Japan, European and American hybrids, it is an excellent variety that combines many advantages. Disease resistance, high yield, very early ripening, easy coloring, storage and transportation resistance, high sugar content, good taste.

All parts of our country can be cultivated on the scale of open land and greenhouses. Shoots greenish-yellow. The young leaves are light green, and the dorsal surface of the leaves is densely hairy.

The adult leaves are large, mostly 4-lobed, and the leaf margins are serrated and blunt. Mature new shoots reddish-brown, garden-shaped. The winter buds are large and plump.

The fruit spike is conical or cylindrical, after hormone treatment, the average spike is 600 900g, the largest spike is 1600g, the fruit is round, the growth is tight, the arrangement is neat, and the average weight after expansion is 8 10g. Combined with fruit thinning and sufficient fertilizer and water application in two swelling stages, the average grain weight was 10 11g. The skin is thick, black to blue-black.

The flesh is hard and crisp, and the juice is pale red. Sweet taste, strawberry aroma, individual ears have 1 2 drupes, 1 extra seed, dry matter content 20 22.

Summer black is more precocious, Zhejiang month.

The ripening time of summer black grape greenhouses is in mid-June, and it is generally about 8 pieces per catty.

Summer black grape, European and American hybrid, triploid variety, seedless, native to Japan. The average spike weight is about 420 grams, the size of the spike is neat, and the fruit is tightly grown.

The fruit is nearly round, the natural grain weight is about gram, and it can reach gram after gibberellin treatment, the peel is purple and black, the fruit is easy to color, and the ripeness is consistent. The fruit powder is thick, the skin is thick and crisp, the flesh is hard and brittle, there is no flesh sac, there is a strong rose fragrance, no seeds, and the quality is good.

The plant grows vigorously, with a bud germination rate of 85% and a branch growth rate of 95%, and each fruiting branch bears an average inflorescence. It takes 100 120 days from germination to fruit ripening, early maturity, strong disease resistance, no fruit cracking, no grain falling, and good storage and transportation resistance.

Precautions: The plant grows vigorously, the adult leaves are extra-large, nearly round, and the diameter can reach 20 25 cm, which is easy to cause shading, resulting in slow coloring of the fruit ears. Naturally grown fruits are small and need to be treated with gibberellin, otherwise they will have a large footprint, low yield, and poor commodity value.

Special attention should be paid to greenhouse cultivation: first, it cannot be densely planted, and there must be enough space for growth. Second, we must have a good grasp of gibberellin treatment technology, otherwise, the fruit is too small, the yield per unit area is too low, and it will not make money.

The temperature and humidity in the greenhouse should be reasonably controlled, and attention should be paid to the management of greenhouse grapes, spraying Kao No. 3 to promote flower bud differentiation during the flower bud differentiation period, and spraying Zhuangguo Tiling to thicken the fruit pedicle before flowering and the fruit expansion period at the young fruit stage to prevent fruit dropping. More technologies can be found on the China Plant Protection Network.

Summer black grows strongly, the flower buds are well differentiated, and the full thin branches can also extract flower spikes. The leaves are erect, the leaf color is dark green, the photosynthetic efficiency is high, and the cultivation management is easy, which promotes the cultivation effect better. It can be propagated by cuttings or grafting.

The young tree management scaffolding type adopts a "high, wide, and vertical T-frame", and in addition, summer black is also suitable for trellis cultivation.

Dig a ditch and fertilize before planting, plant according to 1m plant spacing, and water the root water thoroughly and cover the mulch film after planting.

Wipe the buds and fix the shoots: Erase the double buds, multi-headed buds, and too weak buds after germination; After forming a new shoot, tie the wire on both sides, and set the tip at a distance of 15 to 20cm.

Thinning the panicle and setting the yield After budding to the early flowering stage, the extra-large spike and weak spikelet are thinned.

Thinning flowers and fruits The fruit setting rate of summer black is very high, so the secondary spike and several branches under the secondary spike should be thinned one week before flowering, and the tip of the panicle should be lightly pinched or even not pinched to maintain the conical fruit spike. Fruit thinning after flower and fruit fall are stable.

Ring peeling During the first immersion of the bulking agent, the ring peel is carried out on the main trunk branch, 2 3 mm wide, deep to the xylem, and then the wound is tied with tape, which can promote the enlargement of the fruit. Ring peeling of berries when they first start coloring allows them to ripen early.

Top dressing of bulging fertilizer Generally, after flowering, fully decomposed chicken manure or cake fertilizer is applied in a timely manner, 200kg per mu, combined with 30kg of ternary compound fertilizer, 10kg of potassium sulfate, and applied in two times.

Top dressing fertilizer When the berries turn color, top dressing potassium sulfate 10 15kg per mu. Combined with spraying pesticides, add foliar fertilizer potassium dihydrogen phosphate or Baolifeng No. 2.

Controlling the growth of new shoots After the fruit is bagged, especially during the coloring period, it is necessary to strictly control the growth of new shoots, which is the key to summer black management. Failure to do so will result in slow coloring and delayed maturation. The growth of shoots can be inhibited by topping or foliar sprays, but the most important thing is to control the amount of nitrogen fertilizer and increase the proportion of phosphorus and potassium fertilizer.

After a few years of planting, it can be thinned to expand the canopy and maintain a balanced growth.

After the fruit is harvested, at the end of August and the beginning of September, 4000 5000kg of rotting organic fertilizer (such as pig manure, etc.) and 50kg of superphosphate can be applied per mu in combination with deep turning, and the ditch is made into a high ridge.