Factors Affecting Apple Fruit Coloring

Apple is a kind of fruit that many people like to eat very much, and it is also very common in our daily life. Therefore, apples are now planted all over our country. When growing apples, if you want to improve the commercial value of apples, you must pay attention to fruit coloring. So what are the factors that affect the coloring of apple fruit? Today, the editor will briefly introduce the factors that affect the coloring of apple fruit. Let's take a look.

1. Temperature factor

Apple is a kind of fruit that likes to grow in a cool environment, so temperature is the main reason that affects the coloring of apple fruit. In the first half month of apple harvest, the change of temperature will be negatively correlated with anthocyanins, and the lower temperature environment can promote the synthesis of anthocyanins. Therefore, during the coloring period of apple fruit, it is very beneficial to keep the average temperature at a low stage and enlarge the temperature difference between day and night. Especially for the fruits of middle and late ripening varieties, the temperature difference should be kept at about 10 degrees.

2. Tree nutrition

The accumulation of nutrients in apple trees will also affect the coloring of apple fruits, especially the accumulation of nutrients such as sugar. But the most important thing is the soluble solids in the fruit. According to a survey of professional data, the coloring rate of apple fruit is less than 40%. Then the content of soluble solids in the fruit will not exceed 12%. If the coloring rate reaches 80%, then the content of soluble solids can reach about 15%. Therefore, it can be seen that the coloring rate of apple fruit is proportional to the content of soluble solids.

3. Nutrition proportion

The demand for nutrition in the growth of apples is very large, and it is also more comprehensive. Different kinds of minerals have a direct effect on the coloring of apple fruit. For example, if it is a Fuji apple, in July, if the proportion of nitrogen in the tree is less than 2.5%, the petiole is still green, resulting in insufficient sugar accumulation and poor coloring of the fruit. Therefore, we should apply fertilizer according to the nutrition proportion of apple fruit trees, for example, if the fruit trees are deficient in potassium, then appropriately increasing the proportion of potassium fertilizer can promote fruit coloring. If the fruit is not short of potassium, there is no need to apply potash fertilizer, otherwise it will be very disadvantageous to the coloring of the fruit.

4. Other factors

The coloring of apples will be different because of the variety and other factors, mainly because the heredity of different varieties will be different. Therefore, the poor coloring of apple fruit may be caused by the variety, and the common Fuji apple is a kind of variety which is not easy to color. Then there is the lighting factor, which is one of the main reasons that affect the coloring of apples. If the apple fruit is affected by uneven or insufficient light, it will have a great impact on the coloring of the fruit, so we should pay more attention to it.

The above is a brief introduction to the factors that affect the coloring of apple fruit. This is the end of today's introduction, this article is for reference only, I hope it can be helpful to everyone!