Main Cultivation Techniques of Sweet Corn
(1) Land selection The sweet corn needs more water but is afraid of earthworms. It is necessary to use sandy loam with convenient drainage and irrigation and good fertility. At the same time, sweet corn must be grown separately from ordinary corn to ensure product quality. Generally, the isolation distance is 200 meters or more. If segregated with time, the sowing date should be more than 30 days to prevent different types of sweet corn bunching. (2) Seeding and Seedling Cultivation In Guangdong, sweet corn is generally planted two or three times per year. Spring sowing is appropriate in the middle and early March, and autumn sowing in the middle and early August. The sowing date can be appropriately adjusted according to the market demand. General application of sorghum cultivation, pod width of 1.3 meters to 1.5 meters (even ditch), double row planting, plant spacing 25 cm to 30 cm, planting density of about 3500 per mu. Live broadcast is usually used. Before sowing, apply sufficient farmyard manure (about 500 kg to 600 kg per mu), and mix 2500 kg to 3500 kg of superphosphate in the farmyard manure. If on-demand, 3 tablets per hole and 3 cm soil cover. It is advisable to keep 80% of the field water capacity after sowing. Can also be used to cover or transplant seedlings. (C) field management Seedlings 3 leaves when transplanting seedlings, remove the seedlings preferably in the evening or cloudy days. 4 leaves ~ 5 leaves when Dingmiao, 1 per hole. Plant fertilizers when jointing the plant, large flares, and silking. The soil water holding capacity should be 60% to 80%, and it can be slightly lower before jointing to promote root development. From the booting to the early stage of grouting, sufficient water is required to facilitate the promotion of panicle granule growth. After the jointing stage, the earth is raised to the big bell-mouth stage to achieve the purpose of promoting root lodging resistance. During the flowering and pollination, in case of low temperature and rainy weather, artificially assisted pollination should be carried out in time to reduce bald head and improve the quality of production and ear products. (D) Diseases, Insect Pests and Weeds The control of sweet corn has high sugar content and serious pests and diseases. Diseases with large, small spot, and sheath blight are more common. In addition to the selection of disease-resistant varieties, Weifu pesticide dressing (300 milliliters of pesticide plus 100 kilograms of water-seed) can effectively control and delay disease occurrence. Seedling pests include aunts and armyworms, which can be used to irrigate the soil with 1200-1500-fold double or 1200-1500-fold dipterex, or with the mixture of Miller mixed sand plants. During the middle and late growth period, corn flag, armyworm and aphid have serious damages, and BT emulsions, trichlorfon and insecticides can be used for prevention and treatment. However, attention should be paid to the use period and dosage so as to avoid pesticide pollution to the barley. Sweet corn grows mainly in high temperature and rainy season. Weeding is a non-negligible measure. Chemical weedicides Atrazine and cable are commonly used for weeding. The method is to use 40% atrazine 100g per acre with 150ml cable 150ml, when used 30kg to 50kg of water, hand spraying after sowing the soil, the soil should be good when spraying, in order to ensure the drug Effective play. (V) The timely harvesting of sweet corn during the maturation process has a great change in sugar content, and whether timely harvesting directly affects its product quality and nutritional quality. The suitable harvest period of sweet corn is usually 20 days to 25 days after pollination, and the spring sowing can be harvested as early as 1 day to 2 days, and the summer sowing should be as late as 1 day to 2 days. After harvesting, it must be sold and processed in time, or refrigerated at 4°C to reduce the degradation rate of sugar. China Agricultural Network Editor