Weather in Lishu, Siping, Jilin

The life span of pear trees is usually 20-30 years, and the longest life span can even exceed 100 years. In fact, the maintenance of pear trees at ordinary times has a great influence on the life of pear trees, and the life of pear trees is related to maintenance. The maintenance of pear trees needs to adapt to the temperature, for example, pear trees need relatively high temperature in the growth period and adaptive low temperature in the dormancy period. There are many kinds of pear trees, such as Qiuzi pear with 4- 12 degree, Sha pear with12 degree, Pak Lei pear with 7- 15 degree and western pear. When the root system is active, when the soil temperature is above 0.5 degrees, new roots will grow at 6-7 degrees. Pear trees will stop growing once they exceed 30 degrees or drop below 0 degrees. Pear trees can bloom when the temperature is above 14, and the flowering speed will be accelerated when the temperature is above 14.

Different varieties of pear trees have different cold tolerance. For example, Qiuzi pear is relatively hardy. If it is a wild variety, it can resist the low temperature of MINUS 52 degrees, and the cold tolerance of cultivated varieties is MINUS 30 degrees to MINUS 35 degrees. Pear trees are also sunshine-loving fruit trees, and the annual sunshine demand is 1600- 1700 hours. The growth of pear trees also needs a lot of water. Its transpiration coefficient is 284-40 1, and the transpiration water per square meter is about 40g. Once it is lower than 10g, it will cause harm.

Pear trees have strong adaptability to soil and can adapt to sandy loam with low groundwater level. Its adaptability to soil pH is also relatively wide. The PH index value is in the range of 5-8.5, and it can grow normally in this range. The optimum pH index is 5.8-7, which is the most suitable for growth. At the same time, pear trees have strong saline-alkali tolerance.

Pear trees need fertilization every year, so that the trees can grow, blossom and bear fruit healthily. Nitrogen fertilizer should be applied to young trees that have not yet borne fruit, and nitrogen, phosphorus and potassium should be used together after pear trees bear fruit. During the growing period, according to the change of leaf color, some fertilizers can be sprayed on the leaves. Nitrogen fertilizer is mainly used in the early stage, and phosphorus and potassium are used together in the later stage. After the fruit is harvested, it can be sprayed with 1-2 times fertilizer to strengthen the later photosynthetic products.