Grape size is actually caused by these reasons!

Grape size and grain are the main problems of grapes. Most of the domestic vineyards occur. After fruit setting, the fruit size is uneven, and the large size is small, which seriously affects the grape yield, quality, sales price and income of the fruit farmers. There are many reasons for the size and size of the grapes, and the performance is not the same. According to the situation of the orchard, the symptomatic treatment can be solved.

First, what is the size of the grape?

Grape size granules, the so-called large granules refer to normal granules, small granules are smaller than normal granules, like peanuts or soybean granules, and there are usually no seeds in the granules, and they are first colored. If the granules are large or small, the product value will be greatly reduced. The performance of grape-sized granules usually occurs in pieces.

Second, the production of large and small particles have the following conditions:

Many grape growers are confused about the size of the grain. There are many reasons for the size and size of the grapes, and the performance is not the same. According to the situation of the orchard, the symptomatic treatment can be solved. There are several main situations in size and size:

1, variety reasons: individual varieties such as Jufeng, Victoria, Jingya and other varieties, natural pollination is bad, of course, large and large. This size granule generally has a small number of seeds or no seeds.

Measures: The variety can be changed or denuclearized. After treatment, all the fruit pieces have no seeds. After the expansion, the size of the fruit pieces is uniform.

2, lack of boron: the lack of boron in the grape, leading to difficulty in the expansion of the pollen tube, the ovule is difficult to fertilize, can not form seeds. The size of the grain caused by boron deficiency, generally small fruit without seeds or only one seed, the flower cap is not easy to fall, the fruit is less, the orchard is seriously deficient in boron, and the leaves may have watermelon-like leaves or spots on the sun. Slow growth and slow growth of new shoots.

Measures: The boron-deficient grape is best sprayed with 1500 times of boron in the leaves after picking the fruit. The orchard with severe boron deficiency can be used twice in 10 days or twice as much as in the soil, or in the grape inflorescence. During the separation period, the leaves are sprayed with 1500-2000 times of boron 1-2 to 2 times.

3, zinc deficiency: grape zinc deficiency, auxin synthesis is insufficient, growth retardation, less fruit, flower cap is not easy to fall, size and size. Large and small granules caused by zinc deficiency, when ripe, large and small granules can be colored normally, and some small granules may also have seeds.

Measures: Zinc-deficient orchards can be sprayed with zinc fertilizer such as zinc-calcium amino acid on the foliar surface 15 days before fruit picking, or 300 times as much as zinc-calcium amino acid on the leaf surface before and after flowering.

4, bad weather during flowering: low temperature and rainy weather or high temperature and dry weather during flowering can cause poor pollination, less fruit, size and size. The size of the grain formed by the weather factor, the dumbbell-shaped ear can be seen in the field. Low temperature and rainy rain are more common in the southern regions; in the north, many fruit farmers are worried that the fruit setting is not good, and they dare not water the flowers before flowering. Once they encounter high temperature weather, there will be a lot of fruit drop phenomenon.

Measures: There is no way to change the low temperature and rain. High temperature and drought can be alleviated by proper watering before flowering. Once the size has been formed, consider discarding the first capsule and leaving the second capsule. If the local weather is not conducive to pollination and fruiting, it can be considered to carry out denuclear cultivation.

5, improper administration of hormones: improper administration of hormones is generally divided into several periods, the first period is when some varieties are elongated inflorescence, the application of gibberellic acid is too late, affecting pollination, the fruit is as big as the match head, to the maturity The second period is the flowering period. There are many orchards. In the flowering period, the fruit-bearing medicines controlled by growth are used. The improper application causes poor pollination, the fruit is small, the string is tight, the fruit grains do not expand normally, and some also show cobs. The third period is after the Xiehua, many fruit farmers use the swelling agent hormone too early, resulting in seed abortion, seed coat, black, is empty shell, this fruit is significantly smaller than normal fruit.

Measures: In the above situation, when hormone administration is not well understood, hormones should be used as little or as little as possible.

6, prolonged: Wang Chang caused by the size of the grain is characterized by thick branches, long sections, some also show inflorescence distortion, flower buds are not normal development, etc., large seeds have seeds, especially large, small particles are small, and less fruit. The size and size caused by Wangchang is related to the growth of the branches in the previous year. The last year was prosperous, resulting in poor flower bud differentiation. In the same year, the long branches will also appear in the next year.

Measures: For the long orchard, the first is to control the application of nitrogen fertilizer, less watering, and control soil drought. For the long branches, advance bows, early picking, twisting branches, or ring cutting, etc., when the winter is pruned, the long branches are more buds. Only when the year is well controlled, there will be no size in the next year.

7, the strength is weak: some orchards, after planting yellow, the ear is also yellow, less fruit, size, some will be yellow next year, the same size. This orchard is often caused by high yields in the previous year, damage to fertilizers, accumulation of water in the later stages, large number of roots in winter and spring, and premature defoliation caused by downy mildew.

Measures: The orchard after germination, the root system is already weak, it is not easy to fertilize and water, and the leaf surface should be sprayed with zinc-calcium amino acid 300 times solution + urea 400 times solution + potassium dihydrogen phosphate 800 times solution, once every 2 days. 3 to 5 times in a row, the first is to restore the nutrition of the leaves, in order to promote root growth, loose soil ventilation, improve ground temperature is conducive to root growth. If the big fat water, the soil temperature is low, but it will not inhibit the growth and absorption of the root system, the tree part will be more yellow.

8. The output is too high: the orchard with too high yield, the size of the grain is mature, the large grain is colored first, the first is red, the small grain is green, the flower string. This is often caused by excessive fruit retention, excessive branches, and insufficient effective leaves.

Measures: Reasonable yield and branch density, good field management, reasonable branching, and scientific and rational fertilizer and water management can avoid this situation.

9. Viral infection or tree degradation: For individual tetraploid species such as Kyoho, it is prone to tree degradation, or grape damaged by virus disease, the tree is weak, and the ear is undernourished. This kind of grape is mostly expressed in the fact that there are only a few trees, one or two trees or three or five trees in the field, the same fertilization and watering, the result is small, the size of the grain, and it is the same year.

Measures: For this tree, there is no reserved value, you can dig out the replanting.

In summary, there are many reasons for size and size, and the symptoms are not the same. It is necessary to solve the problem according to the situation of each orchard, instead of blindly learning the treatment of others. (Pesticide Assistant)