Greenhouse fruit breaks dormancy

First, the impact of low temperature accumulated temperature (required cold) on fruit trees: warm winter climate, fruit trees cultivated in greenhouses, when the demand for low temperature does not meet the fruit tree growth requirements, even if the temperature is increased in advance, although the fruit trees can germinate and grow, but the germination rate is low, from The number of days required for warming until flowering is high, germination and flowering are irregular, and fruit setting rate is low.

Second, the fruit tree needs cold: generally refers to the dormancy period of fruit trees for low temperature requirements, often 0 °C - 7.2 °C low temperature accumulation in hours. Different species, different varieties, the need for different cold. According to experts' research, the required cooling capacity for grapes is 1000-1500 hours, the required cooling capacity for peaches is 600-1000 hours, and the cooling capacity for apricots is 600-800 hours. According to the analysis of meteorological data, in normal years, the winter low temperature in the south cannot meet the needs of the dormant period of grapes, and less warm days and 7.2°C below the low temperature will seriously affect sprouting, flowering amount, and yield.

Third, plant dormancy terminator (breaking agent), lime nitrogen (cyanamide) treatment to relieve dormancy, can replace the biological effects of low temperature.

1. Application on grapes: Concentration: Lime nitrogen 15-20%, that is, 5-7 times of watering. The tree with weak growth has low concentration, more than 20% is easy to damage, but it inhibits germination. Cyanogen can be used after the effective ingredient is 1.5% water soluble. Use period: It is 20-35 days before germination. It should not be used prematurely and the early sprouts will suffer cold, cold and cold. It should not be used too late.

Lime nitrogen solution preparation method: Lime nitrogen slowly poured into hot water above 70 °C, immediately stirred, container capped, soaked for more than 2 hours, can be used after natural cooling. Should not use cold water.

Branching sites: Results 1-2 buds at the top of the parent shoots have no apical dominance; old vines should not be painted; the result tree does not use the winter buds of the resulting shoots. Do not coat the rest of the buds.

Tufting method: Use a small brush or sponge, cotton balls and other materials on the buds. While stirring, the aqueous solution is stirred and the black precipitates are coated together on the resulting mother branch, enhancing the legibility and avoiding recoating and coating. With the coating, the liquid can be soaked for 2 hours, or soaked overnight for the next day.

Matters needing attention: after treatment, should pay for moisturizing, gradually warming, prevent high temperature germination, new shoots long, small inflorescences, serious flowering fruit drop, set fruit less. Lime nitrogen is toxic and must not come in contact with skin or splash in eyes.

2. Application of cyanogenic ammonia on sweet cherries: Prepare an effective concentration of cyanamide solution of 0.6-1%. Before germination, use a backpack sprayer to spray the whole tree uniformly.

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