Pear requirements for environmental conditions
1, different temperature pears of different types have different cold resistance. Qiu Zi Pear can withstand -30 - 35 °C low temperature. Pear can be resistant to -20 - 25 °C, sand pear and pear can withstand -20 °C low temperature. Different varieties have different cold resistance. The underground root system of pear trees began to move when the soil temperature was about 0.5°C, and new roots grew at 6-7°C. The fastest growth rate was at 21.6-22.2°C, and the growth stopped at 27-29°C. Pear tree flowering temperature can not be lower than 10 °C, more rapid flowering above 14 °C, 24 °C pollen tube growth is fastest, below 4-5 °C is frozen. Flower bud differentiation is best at temperatures around 20°C. The flowering period of the pear tree is earlier, and the yield is affected by the frost damage in North China. 2, light pear is a light tree species, the annual need for sunshine 1600-1700 hours, usually with more than 3 hours of direct light in a day as well. When the crown canopy is closed, the branchlets of the internal condyle are easy to weaken and die, and the flower buds are not easy to form. Therefore, the planting density, the height of the tree crown, and the pruning method should all pay attention to the characteristics of the pear tree. 3, the soil with deep soil, loose, well-drained sandy loam is appropriate. The pH can grow well between 5.8-8.5 (depending on the type of rootstock), but is best at neutrality. Different types of pear trees have different drought resistance and Qiu Zi pears. Western fruits are more resistant to drought, while white pears and sand pears are worse. However, all pears are relatively resistant. The pear-producing areas of our country have the idiom of "Yaozi dry dates", but they are dead after immersed in hot dead water for 1-2 days.