What kind of pesticide is used to color cherries?
Cherry is a common fruit in China, which has high nutritional value and sweet taste. It is very popular in many areas. What kind of pesticide is used for cherry coloring?
1. Increase the temperature difference
During the period from coloring to ripening, the temperature should be higher in daytime and lower at night. Keeping the diurnal temperature difference of 10 ℃ ~ 12 ℃ can promote sugar accumulation, which is beneficial to the improvement of fruit coloring and soluble solids content.
2. Improve the lighting
Remove some shaded and overdense shoots in the crown. The reflective film is laid under the crown, and the scattered light in the crown is added. During the fruit coloring period, remove an appropriate amount of leaves that block the fruit from the sun, and be careful not to remove too much; after the frost period, air-letting training for 2-3 days, roll up the greenhouse film on cloudy days to enhance the light, such as a drop in temperature or rainy days, cover the film from the beginning, improve the temperature and prevent rain.
3. Reduce humidity
After the hard core stage, ventilation and dehumidification, furrow irrigation and hole irrigation under plastic film, properly increasing greenhouse temperature and decreasing air relative humidity can improve fruit transpiration rate, promote sugar transport to fruit and increase fruit sugar content.
4. Water management
Always keep the soil water content at 60% 80% of the maximum water holding capacity in the field. Especially in the fruit expansion to ripening period, it is necessary to water frequently to avoid sudden dry and wet, which can effectively avoid preharvest fruit cracking of cherries.
5. Spraying fertilizer outside the root
Spraying 0.2% urea and 0.2% potassium dihydrogen phosphate every 10-15 days can supplement the mineral elements needed for fruit development, especially potassium related to fruit quality, which is beneficial to increase the number of fruits and improve the sugar content of fruits.
6. Open the greenhouse film
For some late-ripening cherry varieties, when the temperature is high before harvest, open or remove the greenhouse film to make the fruit withstand direct light for 3-5 days, which can obviously accelerate the fruit coloring.
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