What are the symptoms of calcium deficiency in grapes?
Grapes are grown all over China, and when growing grapes, fertilization work is very important. In addition to basic fertilizers such as nitrogen, phosphorus and potassium, nutrient elements such as calcium must also be supplemented in time. Calcium plays a great role in the growth of grapes. If grapes lack calcium during growth, then calcium deficiency is likely to occur. So what are the symptoms of calcium deficiency in grapes? Below, the editor will briefly introduce them to you. Let's take a look!
1. Symptom performance
During the growth of grapes, if there is a calcium deficiency, the leaves will show reverse leaf curling. Many spots will appear on the young leaves, and the spots will gradually lose green, finally becoming dark brown, and then becoming dead spots. If the calcium deficiency is severe, the growing point of the grape's new shoots will gradually necrose, causing the grapes to develop many diseases such as fruit cracking and fruit shrinkage, reducing fruit firmness and storability. At the same time, calcium is also an important component of the cell wall. After calcium deficiency, the grape fruit skin will be thin. When encountering a high-temperature and strong-light environment, sunburn fruit is likely to occur, and after maturity, when encountering the rainy season, fruit cracking is also likely to occur, reducing grape yield and quality.
2. Causes of calcium deficiency
Insufficient calcium content in the soil is one of the main causes of calcium deficiency in grapes. This is because the calcium content of the soil itself is not very high, especially in some igneous rocks, siliceous sandstone, or saline-alkali soils with high exchangeable sodium. However, under normal circumstances, grapes are not grown in this kind of soil. The main reason is still severe soil acidification, which leads to insufficient organic matter content in the soil, thereby reducing the content of calcium elements such as exchangeable calcium and solution calcium in the soil, causing calcium deficiency in grapes.
Another reason is soil salinization. If the soil is salinized, although the exchangeable calcium element in the soil is relatively sufficient, it is generally difficult for it to enter the soil solution and move to the grape roots. Moreover, if there is long-term drought and strong evaporation, it will further inhibit the absorption of calcium elements, leading to calcium deficiency in grapes. Finally, if the grape roots are damaged or when fertilizing, if fertilizers such as phosphorus and potassium fertilizers are applied excessively, they will affect the calcium absorption of grapes, thereby causing calcium deficiency in grapes.
3. Solutions
We should mainly focus on prevention. First, when fertilizing, we should pay attention to the proportion of calcium elements and supplement calcium for the soil. Then appropriately improve the soil structure and reasonably increase the application amount of organic fertilizer. And control the amount of major elements such as nitrogen, phosphorus and potassium, and maintain a good ratio. Then during the grape leaf expansion period, we can supplement calcium elements for the grapevine by spraying foliar fertilizer, ensuring normal growth of the grapes.
The above is a brief introduction to what the symptoms of calcium deficiency in grapes are. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!