1, stubble arrangement and variety selection: to determine stubble and variety selection, we should first base on the local climate characteristics and the expected time to market, and then on the processing capacity and market demand. Black corn varieties commonly used in production mainly include Italian black corn, Peruvian black corn, Korean purple sweet black corn, backer black corn and so on.

2. Isolated planting: Black corn should be planted in isolation to avoid cross pollination, which will affect the quality and coloring. There are two isolation methods: one is the distance isolation method, and there are no other corn seeds within 350-400 meters around the field where black corn is planted; The second is the time isolation method, which does not sow other corn varieties for 20 days before and after sowing black corn, staggered the flowering and pollination time of corn to prevent cross pollination.

3, seed treatment: black corn seeds are small, not full, and store less nutrients. Before sowing, seeds are dried, soaked in warm water and dressed with chemicals. Sun the seeds about 7 days before sowing, and divide the seeds according to the size; Soak the seeds in 0.2%-0.4% potassium dihydrogen phosphate solution 12 hours, take out and drain the water, put them at 30℃ to accelerate germination, and sow when the seeds turn 70%-80% white.

4. Fine soil preparation and reasonable close planting: Black corn has weak germination and weak soil arch, so it should be planted in plots with good soil fertility, moderate pH, convenient irrigation and drainage, and sufficient soil moisture. Fine soil preparation, shallow sowing and fine sowing, the depth is generally 4 cm. The planting density of black corn depends on variety characteristics, soil fertility, sowing date, planting method and market demand.

5. Field management: In the 3-4 leaf stage, the seedlings should be replanted and transplanted. Bring soil when transplanting seedlings, and water them immediately after planting, preferably in the evening or cloudy days. 5. Sow 1 seedling in each hole at leaf stage, combine topdressing, intertillage and weeding, loosen soil at seedling stage, and cultivate soil before jointing stage to big bell stage. Reasonable irrigation and drainage, when the soil moisture at seedling stage is 50%-60% of the maximum field capacity, no irrigation is needed, and the soil moisture should be kept at 70% of the maximum field capacity after jointing. Black corn has the characteristics of tillering and branching. In order to ensure the yield and grade of panicle, tillers should be pulled out as soon as possible to avoid damaging the main stems and leaves, and topdressing should be applied 1 time at jointing stage, heading and flowering stage and filling stage respectively.

6. Artificial pollination: Due to the high density of black corn and the mutual shading of leaves, it is easy to cause poor pollination. It is necessary to manually collect pollen for the ear when flowering, and harvest it while giving it to the ear. Every morning,10-1/pollinate for 3-5 days.

7. Pest control: On the basis of implementing comprehensive agricultural control measures, use corresponding pesticides, but be careful not to use pesticides with large residue and long residue period, and stop using them 20 days before listing to prevent pesticide poisoning after eating fresh spikes. The corn borer is harmful to black corn, which not only affects the yield, but also affects the ear beauty and commodity grade. Based on crop rotation and field cleaning of corn stalks, chemical control is adopted, but it is best to use biological agents: Bt emulsion (powder) per mu 150-200 g, mixed with 10 kg sand, and withdrawn into the bell mouth at the heart leaf stage of black corn. When the plant height is 30 cm, spraying isocarbophos 1 time, spraying 50 grams of 30% jinggangmycin with 50 kilograms of water per mu at jointing stage, and controlling leaf spot and sheath blight twice with an interval of 15 days.

8. Timely harvesting: The sugar content is the highest and the skin is the thinnest. It is most suitable to harvest 22-28 days after spinning. Harvesting early or late will affect the quality and taste of black corn.