It is most suitable for growing in areas with high temperature, long sunshine, dry climate and distinct wet and dry seasons. Normal growth, flowering and fruiting need to be carried out under the environmental conditions of daily average temperature 10℃ or above, annual accumulated temperature of about 7500℃, rainfall 1000 mm or below and sunshine hours of more than 2200 hours. The requirements for soil conditions are not very strict. It can grow well on loose and fertile south subtropical red soil, latosol and alluvial sandy soil, but it grows poorly on clay and barren soil. With strong vitality, evergreen seasons and beautiful tree shape, it is a good windbreak forest with great utilization value.

Zizyphus jujuba is suitable for growing in dry-hot valley. Planting Zizyphus jujuba in dry-hot valley will greatly solve the phenomenon of desertification and soil erosion in dry-hot valley, and also bring economic sources to farmers in dry-hot valley. Because Zizyphus jujuba has good heat and drought resistance, easy planting, easy management and long fruiting period, the development of Zizyphus jujuba industry will not only benefit the present, but also benefit future generations.

The effect of sour angle on improving dry-hot valley: the growth of sour angle accords with the climate of dry-hot valley in Jinsha River, where the annual average temperature is above 19℃ and the altitude is below1400 m, and the Ziziphus jujuba resources in Jinsha River basin are mostly distributed in a star shape, and naturally survive when it rains, basically in a state of no pruning, no fertilization, no insect control, no water accumulation and no moisture conservation. Young trees bear fruit late, the trees are messy, the branches are dense, the inner cavity is closed, the nutrition grows vigorously, the platform function fails, the fruit moves out, the fruit is small, the yield is low, the quality is poor, the fruit commodity value is low, and the economic life is short. Will eventually die by itself. In order to study the high-yield cultivation techniques and measures of rain-fed tamarind and improve its yield and quality, a 667hm2 (about 8000 plants) tamarind cultivation demonstration garden was established in 1992 Yuanmou dry-hot valley, and the high-yield cultivation techniques of rain-fed tamarind were preliminarily summarized. It is used to guide the production and cultivation of tamarind. 1 1992. The average plant height, crown width and ground diameter of 3-year-old tamarind are 2.56m, 6.74m and 727cm, respectively, and the fruit rate of flowers is 165 1, which has begun to have a certain economic yield. The 4-year-old flowering and seed setting rate is 70, and the average yield per plant is 3.6 kg; the 55-year-old flowering and seed setting rate is 98, and the average yield per plant is 5.2. The average plant height of 8-year-old is 5 12m, the crown width is 26.88m, the ground diameter is 1824cm, the yield per plant is 9.8k, the height is 16.5kg, and the commodity rate is 80.