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

<> apple is a fruit that we are all very familiar with, it has many benefits for our human body, can beautify and nourish the skin, and can also supplement the nutrients needed by our human body, its taste is sweet, very thirst-quenching, and is deeply loved by the majority of people.

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

Apple coloration is one of the important indicators of apple quality, according to the consumption habits of domestic groups, consumers prefer fruits with good coloration, high price, good sales and strong competitiveness. However, in recent years, the situation that apples turn yellow and do not color after picking bags has occurred from time to time, and some can not be all red although colored, which seriously affects the quality and commodity rate of apples, and reduces economic benefits. The main reasons for the analysis are as follows:

1. Improper use of fertilizer.

Excessive use of borax or excessive spraying of foliar fertilizer with too high boron content will cause the fruit to turn yellow and not color 2. 3. Continuous high temperature impact. After the fruit is colored in the "beginning of autumn", if there is a high temperature of about 35 for more than 10 days in a row, the temperature in the bag reaches 50, which will affect the formation of anthocyanin, which will promote the formation of coloring substances, so that the fruit will be yellow and not colored.

4. If the bag picking time is too late, it will also cause the fruit to turn yellow and not color Medium-ripe varieties, such as Gala, Shanxia, etc., if the bag is picked at the same time as the red Fuji apple, there will be no color. 5. During the fruit harvest period, the small temperature difference between day and night and the dry climate will also cause the fruit to turn yellow and not to color, and the temperature difference between day and night is small, which is not conducive to fruit coloring. 6. Excessive application of nitrogen fertilizer, bagging apples do not color Especially in the month of excessive nitrogen fertilizer, there will be a phenomenon that the fruit is green and not colored after picking the bag.

7. Rotten roots will also cause the fruit to turn yellow and not color. 8. Excessive application of potassium and phosphorus fertilizers will also cause the fruit to turn yellow and not color. 9. Flood irrigation after bag picking will also aggravate the yellowing and coloring of the fruit.

10. Set of inferior bags Fruit bags with poor air permeability are also easy to cause sunburn, yellowing and coloring of bagged apples.

2. Pick the bag too late.

This year, all those who picked the bags too late will have different degrees of yellowing and not coloring of the fruits. Our "Modern Fruit Industry" suggests that it is advisable to master the growth time of the fruit in the bag from bagging to taking off the bag for about 100-120 days. If the bag is picked too early, the fruit will return to green; Too late, yellowing is not colored, and some have green heads in the calyx.

3. The influence of weather.

After the apples are taken off the bag, one is to encounter three frosts, the second is low humidity, and the third is high temperature and drought, all of which are not conducive to fruit coloring. After taking off the bag, you can spray "Lizhan Jing" in time to prevent frost; In case of high temperature and drought, you can properly water a small amount of water, remember to flood with large water, which is conducive to fruit coloring.

4. In orchards with ring stripping, waterlogging, and rotten roots, the yellowing and coloring of the fruits after taking off the bag is particularly serious.

Excessive ring stripping or circumcision in the trunk can easily lead to starvation and death of the root system, long-term water accumulation in the ground will lead to anaerobic respiration of the root system to produce alcohol root burning, ring stripping and waterlogging will lead to capillary root rot, causing tree weakness, and it is difficult to color the apple after taking off the bag. <>

Because apples are less oxidized after bag picking, apples are not evenly exposed to ultraviolet rays, so there will be no coloring.

The main thing is to see if you pick the bag at the right time, if the bag is picked too early, the apple is easy to turn green, and the quality will naturally not keep up. There is also a lack of light due to the weather.

Reasons why apples are not colored when picking bags: a lot of fertilizer is applied, the temperature is too high, the bags are picked in a hurry, the light is insufficient, and the fruit trees do not bear too much fruit and are picked regularly. Apple's appearance depends on management.

First of all, the first reason may be because of insufficient light, after not absorbing enough light, the second reason is that the nutrients may not be sufficient, so the apple is not colored, which can increase the amount of fertilizer and supplement nutrients to the apple tree.

In recent years, the situation that apples turn yellow and do not color after picking bags has occurred from time to time, and some of them can not be all red although they are colored, which seriously affects the quality and commodity rate of apples and reduces economic benefits. There are several main reasons why this happens:

1. Excessive use of borax or excessive spraying of foliar fertilizer with too high boron content will cause the fruit to turn yellow and not color.

Borax spring application, each tree can not exceed 150 grams, the application of about 100 grams is appropriate, excessive application, will cause the apple to yellow without color, and a yellowing will last for 3 years.

At present, there is a lot of boron-containing foliar fertilizer, and some fruit farmers spray a single dose of boron fertilizer many times during the apple growth period, resulting in excessive boron absorption by fruit trees, and the phenomenon that the fruit is yellow and not colored.

2. The ring is stripped too heavily, causing the fruit to turn yellow and not color.

If the ring is too heavy, the nutrients absorbed by the underground roots can not rise, and the nutrients absorbed by the leaves of the tree can not be refluxed, which will easily lead to the decline of the apple tree, and the fruit will turn yellow due to lack of nutrition.

3. Continuous high temperature affects fruit coloring.

After the beginning of autumn, there was a high temperature of about 35 degrees for more than 10 consecutive days, and the temperature in the bag could reach more than 50 degrees, which affected the formation of the coloring substance anthodins, and thus the fruit was yellow and not colored.

4. If the bag picking time is too late, it will also cause the fruit to turn yellow and not color.

Medium-ripening varieties such as Gala and Shanxia will not be colored if they are picked at the same time as the red Fuji apples. Gala apples, in early August to pick the bag is suitable, if picked 6 7 days later, the fruit is yellow and not colored. Red Fuji apples are best picked from late September to early October, but if they are picked later than 10 days until mid-October, the fruit will turn yellow and not color.

In case of frost, there is also no color.

5. During the fruit harvest period, the small temperature difference between day and night and the dry climate will also cause the fruit to turn yellow and not color.

The temperature difference between day and night is small, which is not conducive to fruit coloring. The weather was dry after the bag was picked, and many orchards were not watered in time, resulting in apples not being colored.

6. Excessive application of nitrogen fertilizer does not color apples.

In particular, if too much nitrogen fertilizer is applied in the month, the fruit will be green and not colored after picking the bag.

7. Rotten roots will also cause the fruit to turn yellow and not color.

In recent years, due to the application of a large number of inorganic fertilizers, resulting in serious soil acidification, root poisoning, nutrient absorption is difficult to absorb, at the same time, due to the fertilizer application technology is not up to standard, there is root burning and other fertilizer damage, both phenomena will cause the fruit to yellow and not color.

8. Excessive application of potassium and phosphorus fertilizers will also cause the fruit to turn yellow and not color.

In recent years, many experts have pointed out that the lack of potassium in the orchard is serious, so the fruit farmers apply a large amount of potassium fertilizer, and the excessive application of potassium fertilizer in successive years will also cause the fruit to turn yellow and not color.

9. Flood irrigation after bag picking will also aggravate the yellowing and coloring of the fruit.

We advocate watering before picking the bag, not watering a lot after picking the bag, and if it is too dry, you can water a small amount of water. In addition, according to the investigation, before and after bagging, there are too many "antibacterial specials" sprayed, and penicillin is sprayed before plastic film bags and bags, which will also cause the yellowing and non-coloring of bagged apples. Therefore, it is hoped that the majority of fruit farmers will manage the orchard scientifically, so as to avoid the yellowing of the fruit.

Do you know what is the reason why apples are yellow and not red after unpacking?

1. Excessive nitrogen fertilizer.

Excessive application of nitrogen fertilizer, especially in July and August, will cause the apples to turn yellow and not color after picking the bag.

2. Boron poisoning, excessive or insufficient potassium fertilizer.

Excessive boron application can lead to boron poisoning, which can cause apples to turn yellow and not color, and once this happens, it can lead to difficulty coloring for 3 years in a row. Lack or excess of potassium fertilizer can also cause the fruit to be uncolored.

3. Ring stripping and circumcision.

When the ring is too heavy, it hinders the normal delivery of nutrients to the tree, and some often fall leaves early, and the nutrient accumulation of the tree is insufficient, resulting in the yellowing of apples and not coloring.

Fourth, the continuous temperature is higher than 24 degrees or lower than 14 degrees, which is not conducive to fruit coloring.

The small temperature difference between day and night is also not conducive to coloring.

Fifth, the time for picking the bag is not suitable.

Some growers pick the bags too early, which will cause the apples to color first and then fade, returning to green. Picking the bag too late can also cause yellowing and not coloring.

Sixth, the tree body is shabby, and the light is insufficient.

This is a common phenomenon in fruit tables at present.

7. Fruit trees bear too much fruit and the load is too large.

8. The quality of paper bags is not good, resulting in poor degreening.

It is the season when apples are on the market in large quantities, and it is the harvest season for fruit growers, and in order to ensure the yield and quality of apples, most of them now adopt bag picking technology.

However, some fruit farmers have recently found that their apples are not colored when they are picked from the bag, and even there is a phenomenon of regreening, which leads to a decrease in the commodity rate. Let's find out.

1. Unreasonable fertilizer application.

In terms of fertilization of fruit trees, it is advocated to use high-quality organic fertilizer, supplemented by chemical fertilizers, and then with an appropriate amount of trace elements, so as to ensure that the nutrition of the tree is comprehensive, so that there will be no certain but always, affecting the final yield and quality.

However, in practice, many fruit farmers attach importance to traditional ideas and often reapply nitrogen fertilizer, resulting in plant growth, a large number of branches germination, and improper pruning, which will lead to poor permeability of fruit trees.

For the bagged apple, its chlorophyll content is low in the case of poor light transmission, so after picking the bag, the fruit will see one, which will accelerate the chlorophyll exchange rate, resulting in the phenomenon of regreening.

For this situation, we must be scientific and reasonable fertilization, pay attention to nitrogen fertilizer fertilization in the pre-growth period, phosphorus and potassium fertilizer in the middle of growth, and pay attention to phosphorus and potassium fertilizer application in the later stage to reduce nitrogen fertilizer application.

2. Pruning is not in place.

Generally, the Guodan Shen Garden, which returns to green after picking the bag, often shows the phenomenon of canopy canopy closure without light, which roughly must be the situation of a large number of branches germinating, large planting density and dense branches.

In addition to improper fertilization, the cause of this is that the plant is not pruned properly, resulting in the growth of plant branches more and more intensively.

So prune at the right time.

Pruning is mainly to create a good fruiting tree shape, 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, 90% of China's apple production will apply bagging technology, and the production cost will also increase.

Many fruit growers Viola reduce the cost of planting, so as to choose low-quality fruit bags, or the market demand for fruit bags is large, resulting in an influx of large number of manufacturers, and the quality of the fruit bags produced is uneven.

When the farmer chooses a lower-quality fruit bag, the fruit will be unsightly and blue in color.

Therefore, when choosing fruit bags, it is necessary to consider from many aspects, to ensure that the fruit bags can withstand the wind, sun and rain without cracks, strong shading, no water seepage, and good gas permeability.

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

In order to seize the market, many fruit farmers tend to pick the bag 10-15 days in advance, which will lead to the shortening of the growth time of the fruit in the fruit bag, which will cause the fruit to not be all green or poorly greened, and the phenomenon of green head appears, similar to regreening.

In addition, the weather is not very good when the bag is picked, and the light is not good, so there is a phenomenon of rejuvenation after picking the bag.

In this case, the fruit grower should strictly follow the established bag picking time to avoid the phenomenon of bag picking too early or too late.