What is the reason why apples are not colored after picking bags?

Now it is the season when a large number of apples are on the market, and it is the harvest season for fruit growers. In order to ensure the yield and quality of apples, most of them use bag-picking technology. However, recently, some fruit farmers have found that their apples are not colored, or even turn green, resulting in a reduction in the commodity rate, so what is the reason why apples are not colored after picking bags? Let's get to know it.

1. Unreasonable application of fertilizer

In the aspect of fruit tree fertilization, it is advocated to give priority to high-quality organic fertilizer, supplemented by chemical fertilizer, combined with appropriate amount of trace elements, so as to ensure a comprehensive supply of tree nutrition, so as not to appear all the time, affecting the final yield and quality. But in practice, many fruit growers attach importance to traditional thinking, often re-apply nitrogen fertilizer, resulting in excessive growth of plants, a large number of branches germination, coupled with improper pruning, will lead to poor permeability of fruit trees. For the bagged apple, in the case of poor light transmission line, its chlorophyll content is lower, so after picking the bag, the fruit will accelerate the rate of chlorophyll exchange, resulting in the phenomenon of turning green. For this situation, we must apply fertilizer scientifically and reasonably, pay attention to nitrogen fertilization in the early stage of growth, combine application of phosphorus and potassium fertilizer in the middle stage of growth, and pay attention to the application of phosphorus and potassium fertilizer in the later stage to reduce the application of nitrogen fertilizer.

2. Not trimmed properly

Generally speaking, the orchards that turn green after picking bags often show the phenomenon that the crown is closed without light, which must be caused by the germination of a large number of branches, high planting density and dense branches. In addition to improper fertilization, the reason is that the plant is not pruned properly, resulting in more and more dense growth of plant branches. So trim it at the right time. Pruning is mainly to create a good fruit tree shape, to create a good ventilation and light transmission environment, which is conducive to fruit coloring.

3. Choose the insured price of the fruit bag.

Since the promotion of fruit bagging technology, bagging technology has been used in 90% of apple production in China, and the production cost will also increase. With the increase of apple cultivation area year by year, bagging mode has been widely promoted. Many fruit growers, Viola, reduce planting costs and choose low-quality fruit bags, or the market demand for fruit bags is large, resulting in the influx of a large number of manufacturers, resulting in uneven quality of fruit bags. When fruit growers choose low-quality fruit bags, they will form fruits with ugly faces and bluish colors. Therefore, in the selection of fruit bags, we should consider from many aspects, to ensure that the fruit bags can withstand the wind and rain without cracking, strong shading, non-seepage, and good air permeability and other advantages.

4. I can't grasp the time to pick up the bag.

The time of picking the bag of apples is also more important. in order to seize the market, many fruit growers often pick the bag 10-15 days in advance, which will shorten the time for the fruit to grow in the bag, thus causing the fruit not to fade completely or poorly, resulting in a green head phenomenon, similar to turning green. There is also in the bag when the weather is not very good, the light is not good, so there is a green phenomenon after taking off the bag. For this situation, fruit growers should strictly follow the established bag picking time to avoid the phenomenon of picking bags too early or too late.

The above is the introduction of the reason why the apple does not color after picking the bag. I hope it can help you. If you want to know more about it, please follow us.