Gao Liangjin (Lijiang City Seed Management Station, Yunnan Province) Located in the western part of Yunnan Province, Lijiang City is located on the southern edge of the Qinghai-Tibet Plateau. It is a transitional zone connecting the middle section of the Hengduan Mountains and the Yunnan-Guizhou Plateau. The Jinsha River has a transit length of 615km and a transit flow of 45 billion m3. Many rivers are formed due to the cutting action of the Jinsha River system. The river valleys, gentle slopes and alluvial fans have the same agricultural production conditions in some tributaries of the tributaries and the dry and hot valleys of the Jinsha River. The farming area of ​​this region in Lijiang City is nearly 13,300 hmz, and the area of ​​hybrid corn planting is 0.57 million. Hm2. Due to the special geographical location, climate, and agricultural production conditions, the specificity of hybrid corn production in the region is formed. 1 Agricultural production conditions in dry hot valley area of ​​Jinsha River in Lijiang City 1.1 abundant light and heat resources The area is at an altitude of 1100 to 1400m, and the average annual temperature is 20.6 to 18.3°C. During the corn growing season, the mean monthly temperatures are 26.1 to 24.4°C, 25.6 to 23.8°C, 24.7 to 22.8°C, and 23.7 to 22.1°C. ≥10°C total accumulated temperature is 7533-7091°C, annual sunshine hours are 2763～2510h, daily difference is 15～11°C, sufficient sunshine, rich calorific resources, favorable for crop growth, if water irrigation, can be three years a year Cooked. 1.2 Insufficient precipitation, rain and heat in the same season The annual precipitation in the region is only 600.7 to 638.1 mm, and in the corn growing season of June, July, August and September, it accounts for 81.40% to 79.8% of the annual precipitation. Precipitation is small and concentrated in the season with the highest temperature from June to September. On the one hand, it is beneficial to the growth of crops in the current season. On the other hand, except for June-September, other times are in the dry season and the climate is dry, so the area belongs to Dry hot valley area. 1.3 Land formation and rich resources This area belongs to the river valley platform formed by the underwater cut of the Jinsha River, or the alluvial fan formed by flooding around the surrounding mountains. The land is relatively flat and open, which is conducive to farming and rich in land resources. It is higher than the rest of the city according to per capita occupancy. At present, there are still some land resources that have not been developed. 1.4 Drought and water shortage are the main limiting factors in agricultural production The annual precipitation in this area is only 600.7-638.1mm, and is concentrated in the period from June to September. It is in arid state at other times. In addition, the degree of water conservancy in the area is relatively low, and there is less storage and water diversion projects. The Jinsha River electromechanical proposed higher irrigation head. Where the electricity is expensive, the cost is high. Therefore, drought and water shortages have become the main limiting factors for agricultural production in the region. Track Trains,Track Running Train,Electric Train Track,Steam Track Trains Hangzhou Trains Equipment Co.,Ltd , https://www.tramscn.com
December 27, 2022