Latest Analysis of Factors Affecting Grape Coloring
Grapes can be said to be a national fruit, and they are cultivated all over our country. Grapes have high nutritional value and are relatively simple to grow. During their growth, grapes need to go through multiple growth stages. Among them, the veraison stage is a very important period, but during grape veraison, many factors often affect grape coloring. So what exactly are the factors? Let's take a look together below!
1. Temperature
Temperature is a key factor in the formation of grape anthocyanins, and grapes need a low-temperature environment when forming anthocyanins. If the temperature is high, it will instead inhibit the formation of anthocyanins. Therefore, this also causes many grapes in high-temperature growing regions to look unripe, with color that simply does not meet the standard for sale, yet they taste very sweet. So professional survey data also shows that when the temperature of the main vine of grapes reaches 20 degrees, the anthocyanin content is far higher than the content in a 30-degree environment. And as the temperature drops, the anthocyanin content also rises significantly.
2. Light
Different grape varieties also have different light requirements. Therefore, differences in light also have a great impact on grape coloring. Among them, varieties such as Red Gaofeng and Red Globe generally increase their coloring ability as light intensity increases. In plain terms, the stronger the light for these varieties, the better the coloring. For varieties such as Black King and Summer Black that do not have strict requirements for light intensity, the relationship between fruit coloring and light is not very great, and sometimes there is even no effect at all.
3. Improper water and fertilizer management
Grape growth has a relatively large demand for potassium, and potassium is also the main factor ensuring grape coloring. However, many fruit growers apply excessive or one-sided nitrogen fertilizer during cultivation, especially when the fruit is coloring. In fact, excessive application of nitrogen fertilizer not only fails to promote fruit coloring, but also inhibits grape coloring. Too much nitrogen fertilizer not only inhibits the accumulation of anthocyanins, but also affects the absorption of nutrients for shoot growth. Then, if too much water is applied when the fruit is coloring, it is easy to cause vigorous growth of new shoots, resulting in the phenomenon of delayed ripening with excessive vegetative growth.
4. Grape trellis
Grapes are a vining crop. During cultivation, in order to allow grapes to grow better and increase yield, trellising work is indispensable. At present, grape trellis systems are generally mainly V-shaped or T-shaped. In fact, the trellis system is also a main factor affecting grape coloring. Professional data surveys have shown that the anthocyanin content of grape fruit under the T-shaped system is far higher than under the double-cross V-shaped system. Fruit yield and quality will also be greatly improved.
The above is a brief introduction to the factors affecting grape coloring. In addition to the above reasons, there are also various factors such as the tree body itself and pests and diseases. Everyone must pay close attention. That is all for today's introduction. This article is for reference only, and we hope it can be helpful to everyone.