What is the suitable temperature and humidity for peach trees in protected cultivation at fruiting stage? What is the standard of thinning fruit?

The optimum temperature for peach growth is 18 ~ 23℃, and the optimum temperature for fruit ripening is about 25℃.

Temperature is the most important factor affecting the distribution of peach trees. In high latitudes, the lowest temperature in winter and the harm of early spring and late frost are the limiting factors. In low latitudes, the factors affecting the normal growth of peach trees are often that they can't meet the requirements of cold resistance, so that they can't germinate and bloom normally. The chilling requirement of different varieties is very different. When peach trees meet the requirements of cold tolerance, after natural dormancy, they begin to move at high temperature, and their cold tolerance is obviously reduced. If the temperature drops again, even if it does not reach the critical temperature, it is easy to cause harm.

Peach trees can adapt to all kinds of temperatures. From the plain to the plateau, except for the extremely cold and hot areas, the areas with annual average temperature of 12 ~ 17℃ grow normally. The optimum temperature for peach growth is 18 ~ 23℃, and the optimum temperature for fruit ripening is about 25℃. Too low or too high temperature will affect the normal growth of peaches. The temperature is too low, the trees develop abnormally, and the fruits are not easy to mature. When the temperature is too high, the branches are easily burned and the fruit quality is reduced. Southern varieties are more resistant to high temperature.

Peach tree originated in northwest China, with high altitude, long sunshine and strong light, which formed the characteristics of liking light. Good lighting conditions are the basic guarantee for peach trees to complete normal growth and development. It includes pollination, fertilization and fruit setting, fruit coloring and quality formation, branch growth and development, flower induction and differentiation, etc. Peach trees are very sensitive to lack of light. In areas with sufficient light, with the expansion of the crown, there are many and full buds and good fruit quality; The buds in the shade of the crown are few and thin, the fruit quality is poor, and there are few branches and leaves. As a result, some parts of the fruit gradually move out and the yield also decreases. Therefore, the planting distance should not be too close, so that the canopy is shielded from each other, which affects the light intensity.

Peach trees are drought-tolerant fruit trees with shallow roots. When the soil moisture content is between 20% and 40%, we think this is an ideal state. Peaches are sensitive to water. Peaches have developed roots and are most afraid of being flooded. As long as there is water for two consecutive days and nights, it may cause fallen leaves and dead trees, causing serious pests and diseases.