What are the latest factors affecting apple fruit coloring?
Apple is a fruit that many people enjoy eating very much, and it is also very common in daily life in our country. Therefore, apples are now grown in all parts of our country. When growing apples, if you want to increase the commercial value of the apples, you must pay attention to fruit coloring. So what are the factors that affect apple fruit coloring? Today the editor will briefly introduce the factors affecting apple fruit coloring. Let's take a look!
1. Temperature factors
Apple is a fruit that likes to grow in a cool environment, so temperature is the main reason affecting apple fruit coloring. About half a month before apple harvest, changes in temperature form a negative correlation with anthocyanins, and a lower temperature environment can promote anthocyanin synthesis. Therefore, during the apple fruit coloring period, keeping the average temperature at a lower stage and appropriately expanding the day-night temperature difference is very beneficial to apple fruit coloring. Especially for the fruits of mid-to-late maturing varieties, the temperature difference should be kept at about 10 degrees.
2. Tree nutrition
The accumulation of nutrients in the apple tree itself will also affect apple fruit coloring, especially the accumulation of nutrients such as sugar. However, the most important thing is still the soluble solids in the fruit. According to professional data surveys, if the coloring rate of apple fruit is lower than 40%, then the soluble solids content in the fruit will not exceed 12%. And if the coloring rate reaches 80%, then the soluble solids content can reach about 15%. Therefore, it can be seen that the coloring rate of apple fruit is directly proportional to the soluble solids content.
3. Nutrient ratio
Apples have a very large and relatively comprehensive demand for nutrients during growth. Different types of minerals have a direct impact on apple fruit coloring. For example, if it is Fuji apple, then in July, if the nitrogen element proportion in the tree is less than 2.5%, the petiole remains green, resulting in insufficient sugar accumulation and poor fruit coloring. Therefore, we should fertilize according to the nutrient ratio of the apple tree. For example, if the fruit tree is deficient in potassium, then appropriately increasing the proportion of potassium fertilizer can promote fruit coloring. And if the fruit is not deficient in potassium, then there is no need to apply potassium fertilizer again, otherwise it is very unfavorable to fruit coloring.
4. Other factors
Apple coloring will vary due to factors such as variety and type, mainly because different varieties also have different heredity. Therefore, poor apple fruit coloring may be caused by variety reasons, and the common Fuji apple is a variety that is not easy to color. Then there is the light factor. Light is one of the main reasons affecting apple coloring. If the apple fruit receives uneven light or insufficient light, then it will have a relatively large impact on fruit coloring, so everyone should pay more attention.
The above is a brief introduction to the factors affecting apple fruit coloring. That is all for today's introduction. This article is for reference only, and I hope it can be helpful to everyone!