What to do when grapes color poorly? The latest solutions
Grapes are a very popular fruit in our daily lives, and they are grown on a relatively large area in our country. The market at home and abroad is very large, so more and more people are growing grapes now. But many people find when growing grapes that the coloring of the grapes is not very good. So what should be done when grapes color poorly? Below, the editor will give you a brief introduction. Let's take a look together!
1. Light control
Light is very important for grape flower bud differentiation, and it also has a very large impact on grape fruit coloring. Whether it is light intensity or duration, both directly affect grape coloring. Under normal circumstances, if you want grape fruits to color normally, then they need to receive about 70% of natural light intensity. So we should pay attention to controlling light well, and promptly remove fruit clusters near the fruit as well as some old leaves and diseased leaves that block light. Healthy leaves should be moved aside appropriately, and bagged fruits should have their bags removed in time in the later stage to promote coloring. If it is a late-maturing variety, then reflective film should be laid in the orchard.
2. Water management
Although grapes have a certain demand for water during growth. But be sure to control the amount of water used well, especially during fruit ripening and coloring. If too much water is applied or there is too much rainfall without drainage, it will increase the water content of the fruit, thereby reducing the fruit's sugar content and anthocyanin concentration, and affecting fruit coloring. So when the fruit is coloring, a relatively dry environment should be maintained. After grapes enter the veraison stage, drip irrigation with small amounts of water and frequent light watering should be used, not flood irrigation, and timely drainage should be carried out when rain occurs.
3. Temperature management
After grapes enter the veraison stage, we also need to control temperature well. A relatively large day-night temperature difference should be maintained, as this is very beneficial for grape sugar content and coloring. Suitable daytime temperatures can increase dry matter accumulation, but the temperature should not be too high, and the maximum should not exceed 40 degrees, otherwise it will instead affect grape coloring. At night, a low-temperature environment should be maintained, mainly to promote grape fruit coloring and sugar accumulation. If you want to increase the day-night temperature difference, then it can be done by laying black film.
4. Reasonable fertilization
During the grape veraison stage, fertilization work should be done well, and the amount of fertilizer applied should be controlled well. Do not apply too much fertilizer. Especially nitrogen fertilizer, because if too much nitrogen fertilizer is applied, it will cause grapes to remain green and mature late, thereby affecting grape coloring. When fertilizing, pay attention to controlling the ratio of nitrogen, phosphorus, and potassium fertilizers, and appropriately supplement organic fertilizer. Among these, potassium fertilizer should be the main one. In addition, attention should also be paid to supplementing nutrients such as calcium and magnesium, which can be supplemented by spraying potassium dihydrogen phosphate as a foliar fertilizer, ensuring normal coloring of grape fruits.
The above is a brief introduction to what to do when grapes color poorly. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!