It is a medicinal value, and people like condiments. In recent years, it has been successfully introduced in parts of the Hexi Irrigated Area of ​​Gansu Province, which is less than 1,700m above sea level. It has been expanding year by year, and the planting level has been continuously improved, and it has embarked on the road to industrial development. As of 1999, the area of ​​Jiuquan and Zhangye reached 0.12 million hm2. Production practices have shown that realizing the inter-planting of corn and corn not only can produce more crops, but also ensure the high yield and stable production of corn. It is an ideal and efficient cultivation mode. 1. Effect and Mechanism of Production Increase From 1998 to 1999, we conducted a sample survey and analysis of the wildly interplanted corn fields planted in Jiuquan and Zhangye. The results showed that this model can achieve an average of 667m2112.5kg and an average corn of 667m2550kg. . The output value increased by 440.00 yuan/667m2, an increase of 28.1%, compared with the single crop. The increase was 1125.00 yuan/667m2, an increase of 71.8%. Analysis of the reasons for the following points: (A) give full play to the crop's individual characteristics and group advantages, like a short growth period (about 110 days), plant dwarf, shallow root distribution, drought resistance characteristics. The maize growth period is longer, the plants are taller, the root system is developed, and the water is hi and fertilizer is good. The two are interplanted reasonably, one high and one low, one deep and one shallow, one long one short and one rare one dense, and become a single group as a complex group. The planar structure is a three-dimensional structure, forming multi-layered lighting, improving the ventilation and light transmission conditions, alleviating the conflicts between water-fighting, fertilizer-fighting, and glory-raising, and effectively exerting the potential for increasing the soil productivity. (2) Making full use of the growing season and improving the multiple cropping. The index is an intercropping corn crop, which is a combination of summer and autumn crops. The growth period is one long and one short. It will make full use of the light energy resources from March to October in Hexi. In the same land, the two crops have missed their growth periods, and their time difference and season difference are fully utilized. Once they are cooked on a year-old crop, they are ripe for one year and two crops, greatly increasing the multiple cropping index, land and light energy utilization, and achieving multi-income collection. (C) Make full use of the mutual coordination among crops, rational close planting, and increase the productivity of populations. Intercropping maize is a matter of early maturation and a short symbiotic period with corn. Individuals can be distributed among maize lines, compared with single plants, 667m2 Bao Miao 150,000 -200,000, the density reduction is not. Maize 667m2 seedling 4000-4500 strain, can maintain a stable density. In this way, it is guaranteed that corn will not lose production and receive more revenue. Second, the main cultivation techniques (a) select the appropriate varieties should choose to branching ability, good maturity, grain full, disease-resistant high yield, early maturing varieties, and do a good job of purification and rejuvenation, seed screening. Maize chooses hybrid seeds such as Zhongdan No.2, Shendan No.10 or Jinhuang 417. (B) the fine soil preparation, intercropping appropriate period of time required to fertilize, 667m2 high-quality farmhouse fertilizer 4000-4500kg, filling the winter water before freezing, in the second half of the following year to suppress the earthworms, enough planting. When sowing seeds and compound fertilizer (usually diammonium phosphate 667m26kg) mixed evenly into the ground, lightly cover the back cover 1.5-2.0cm thick sand can be. Sowing in early March, when the soil moisture is poor, it can be covered with water. Seeding capacity 1.5-2.0kg, Baomian 150,000-200,000. The sowing date of maize is about 7 days later than usual. Hexi is on the 20th of April. It adopts on-demand method. It is 70cm in width from north to south and row width or width (width 20cm, narrow row 30-40cm). Plant spacing is 18-20cm. Naturally. Density ensures 667m24000-4500 strains. To do so as soon as possible sowing, the difference between the two sowing dates of 50 days. (III) Strengthening field management The key to intercropping maize management is the main attack in the early stages, and both in the medium-term and later in the main attack on corn. 1, the amount of top dressing irrigation. Immediately after the emergence, no water should be poured, and about 10cm after emergence should be filled with water. Seedling irrigation should be done as late as possible, and the application of ammonium nitrate 15kg/667m2 or urea 10kg/667m2 should be followed. Irrigation should be performed once at intervals of 15 to 20 days to achieve shallow irrigation and uniform irrigation. In case of high temperature, no irrigation, to prevent steamed seedlings. 2, timely weeding and seedlings. After Miao Qi and time seedlings, seedlings from 6-8cm, clearing the field weeds to ensure seedlings full seedlings. 3, on time to gain solitude. After June 20th, it entered the sallow phase and was collected with yellow to prevent falling seeds. 4, the main attack on corn. Immediately after the harvest, it immediately applied stalk manure to the corn, generally 667m2 nitrosulfate 20kg or long-term ammonium bicarbonate 30kg, timely irrigation after top dressing to ensure absorption; large bellmouth combined irrigation 667m2 followed by ammonium nitrate 20kg or long-term carbon Ammonium 30kg, to promote flowering and solid, and timely scientific pest control, wax harvesting period.