What are the factors that affect the coloring of grapes
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What are the factors that affect the coloring of grapes
Grapes are cultivated all over China. Grapes have high nutritional value and are relatively easy to grow. During the growth of grapes, they go through several growth stages. Among them, the coloring stage is a very important period, but when grapes change color, there are often many factors that affect the coloring of grapes. So what are the specific factors? Let's take a look now!
Temperature
Temperature is a key factor in the formation of grape anthocyanins, which require a low-temperature environment. If the temperature is high, it will inhibit the formation of anthocyanins. Therefore, grapes in many high-temperature planting areas do not look mature and their color does not meet the sales standards, but they taste very sweet. Therefore, professional survey data also show that when the main蔓 temperature of grapes reaches 20℃, the content of anthocyanins is much higher than that below 30℃. The content of anthocyanins increases with the decrease in temperature.
Lighting
Different grape varieties have different requirements for light. Therefore, different lighting has a significant impact on the coloring of grapes. Among them, varieties like Hongfeng and Hongqiu generally improve their coloration ability with the increase in light intensity. The popular view is that the stronger the light, the better the color. For varieties like Black King and Xiazhuang Black, which are not strict about light intensity, the relationship between fruit coloring and lighting is not significant, and sometimes it has no effect at all.
Improper Water and Fertilizer Management
Grapes have a high demand for potassium, which is also a major factor in ensuring the coloring of grapes. However, many fruit growers over-apply nitrogen fertilizer, especially when the fruit is coloring. In fact, excessive application of nitrogen fertilizer not only fails to promote fruit coloring but also inhibits it. Excessive nitrogen fertilizer not only inhibits the accumulation of anthocyanins but also affects the absorption of nutrients by the above-ground growth. If the fruit color is poor and excessive watering occurs, it is easy to cause lush new shoots and a phenomenon of late maturity and excessive greenery.
Grape Trellis
Grapes are a creeping crop. In order to make grapes grow better and increase yield, it is necessary to trellis them. Currently, the posture of grape trellises is generally V-shaped or T-shaped. In fact, posture is also a major factor affecting the coloring of grapes. Professional data show that the content of anthocyanins in T-shaped grape fruits is much higher than that in double-cross V-shaped grape fruits. The yield and quality of the fruit will also be greatly improved.
The above is a brief introduction to the factors affecting the coloring of grapes. In addition to the above reasons, there are also the reasons of the tree itself and factors such as diseases and pests. We must pay more attention. That's all for today's introduction. This article is for reference only.
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