The appearance quality is an important factor that determines the value of the apple product. Bagging is an effective measure to improve the appearance of the fruit. In spite of the “diving†price for apples this year, the difference between bagging and non-bagging, the background color of green and the white color of the background, and the difference between the appearance of the apple and the light of the table will still be doubled. However, some fruit farmers follow the “yellow calendar†in previous years, and the time for the card to seize the bag is “earthly chasing the high priceâ€. As a result, Gala Apple’s “green head†is seriously colored and the background color is worse than that of the green fruit. Bag fruit sold a Pu Guo price." Do you pick up the bag after picking up the apple? For this reason, the reporter interviewed Wei Lixin, an agronomist of the Agricultural Technology Center of Heyang County, Shaanxi Province, who has been on the frontline for years of technical guidance.
Three reasons for removing the green apple
Wei Lixin believes that there are three reasons for the return of apples to apples.
Take off the bag prematurely. Out of bag prematurely, poor fruit maturity, prone to green phenomenon. Due to the hot and cold temperatures in spring and summer this year, the phenological period of various fruit trees has been delayed by about 5 days compared with previous years. Taking Ganlan apple in Ganjing Township of Heyang County as an example, the fruit of the pinching apple from July 28th to 31st was generally severe due to the semi-black and white seeds. The price was 1.7 to 2.0 yuan per catty; On the 1st to the 4th of August, the background color of the broken apples was fast, and the price of the apples was about 2.0 to 2.3 yuan per kilogram. According to experienced fruit farmers, when there is a phenomenon known as "green head", the time for bag removal is delayed by three or five days. The effect before and after the time is "double heaven".
Regardless of the strength of the tree. According to the survey, it is relatively early and good for a weak tree to grow green in the same tree, and Wangshu is relatively late and poor for greening. The reason is that the chlorophyll content of the bagged fruit is gradually reduced under shading conditions, but as long as the tree grows normally after the bag is removed, the chlorophyll of the leaves and fruits of Wangshu is constantly being exchanged. The more prosperous the tree vigor, the quicker the fruit exchanges after seeing the light, and the weaker the tree vigor is, the less exchanged the fruit's chlorophyll is.
Bad weather effects. According to the relevant data, the temperature difference between day and night after bagging is greater than 10 °C, it is conducive to apple coloring and sugar. Therefore, before bagging, we must pay close attention to the short-to-medium-term weather forecast. If the high-temperature weather that exceeds 30°C after bagging lasts for 5 to 7 days, it is not conducive to coloring. According to many years of experience, suitable areas under 800 meters above sea level such as Fuping and Heyang in Shaanxi Province are worthy of “head volt†and the temperature difference between day and night is small, so they should be taken out before and after the rains in late July, because at this time orchards Air humidity and temperature difference between day and night are relatively large, and the color of exposed fruits is relatively fast. The northern part of Heyang, Baoji Fengxiang, and other fruit areas are due to high altitude. Since the early autumn in early August, when the bag was taken off, the temperature was relatively low and the temperature difference between day and night was relatively large. The ratio of the fruit's background color to the whole red fruit was relatively lower than that before the end of July. small.
Flexible grasping time
Wei Lixin suggested that from this year's issue, the determination of the beginning of the bag-breaking period should not be a “card time,†but should be based on the de-greening status of the orchard fruit, the strength of the tree, and the ability to take bags. Before and after the climate conditions are determined flexibly. 600 to 800 meters above sea level in the suitable area, the United States eight, Qinyang, early red friends, golden century and other easy to coloring varieties began to take off the bag should be July 20 to 25, rich pottery, Philippine and other relatively easy The beginning of bagging of coloring varieties should be from July 25th to July 30th; the start time of bag-breaking of 800-1000m eugenic zone, Qinyang, Golden Century, and early-to-earth red licks should be on July 25th. On the 30th, richer pottery, citron, royal crickets and other more easily colored varieties should be from August 1 to August 5. In short, fruit trees with good bleaching, moderate tree vigor, and pre- and post-bagging rainfall should be taken out of the bag as early as possible; “blue head†trees with prosperous trees should be deferred with a delay of 3–5. day. The general principle is: picking off the good and then picking the bag, fade the green worse late a few days; the tree is weak and early, the tree vigorously late; when the rain is not equal, it is not the same time.
Color waxy corn is generally white, yellow, red, purple and black, white, yellow and purple corn is the basic color. The purple gene in a purple/white hybrid will naturally become purple if it "beats" the white gene, and vice versa, if it's a tie, what we see is a white/purple corn. Purple can turn into red corn and black corn, which is often called "red is purple, black is purple."
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