Will the grapes be treated well during the expansion period? It depends on the situation!

Some netizens asked: "is it good to deal with the expansion of grapes?" In fact, the grape expansion period, that is, the grape berries grow rapidly after sitting on the fruit, when the fruit is near the size of soybeans, it is called the grape expansion period. This is the most exuberant period in the annual growth period of grape, and it is also a critical period in grape production throughout the year, so the treatment of grape expansion period should be viewed on a case-by-case basis.

First, which varieties are suitable for expansion treatment?

Basically all grape varieties are suitable for expansion. Therefore, whether it can be expanded or not, it is not the variety that mainly looks at the level of management, ear size, and so on.

For example, the garden with extensive management is not suitable to use expansion agent. on the one hand, the fertilizer and water can not keep up, and the expansion effect is not obvious; second, the lack of trace elements such as boron, calcium and magnesium is more likely to cause cracks.

There is also a situation, the ear is too tight varieties or grape ear, untreated, not suitable for expansion, because the fruit expansion will aggravate the inter-grain extrusion, but also easy to cause cracks.

As shown in the picture, Jufeng sits too much fruit, and the ear is too tight, which is not suitable for expansion, otherwise it is easy to cause extrusion. After grain thinning, the ear is moderately loose and tight, and can be expanded. After panicle pulling and grain thinning, gem grape can still be expanded, while Frei grape can also be expanded after panicle pulling and grain thinning.

Second, what are the advantages of expansion treatment?

1. The fruit becomes bigger, especially the seedless varieties.

For example, Crisson, through expansion, the fruit can be changed from 4 to 5 grams to 8 grams; summer black, through expansion, the fruit can be changed from 5 grams to 6 grams; Frey, through expansion, the fruit grains can be changed from 3 grams to 6 grams.

2. It can promote the denucleation of nucleated varieties.

Through expansion treatment, rose fragrance, Jingya and Jufeng can be changed from seedless varieties to seedless varieties, so as to improve the commerciality of fruits.

3. Make up for the defects of the fruit, make the commodity good, and promote sales.

Such as the giant peak which is not good for setting fruit, through expansion, the fruit becomes compact and the commerciality is improved.

Third, expansion treatment time

If the fruit is treated too early, the pedicel is thickened and hardened more seriously, and it is easy to form a stiff fruit; it is not obvious to miss its natural expansion period too late. So you must pay attention to the time.

When the golden finger grape was inflated 7 days after anthesis, the fruit stalk became thicker and hardened and the recommended expansion time was recommended.

One time after anthesis treatment: the treatment time is about 15 days after Xiehua.

Two times of post-anthesis treatment: 12 days after flowering, the interval was about 7-10 days, and then the second time.

In addition, there is another problem that should be paid attention to in the expansion treatment, because there are many cell divisions, large fruit grains, fast pulp growth, incoordination between pericarp growth and pulp growth, which will appropriately increase the risk of cracking, therefore, it is necessary to increase the use of calcium fertilizer. For different varieties of targeted use of expansion agent, and must increase fertilizer and water investment, in the case of sufficient fertilizer and water conditions, the correct use of expansion agent will not affect the inherent quality and taste of grapes.