Yuetian No. 2 and Yuetian No. 3 are newly developed hybrid super-sweet corn varieties by the Crop Research Institute of Guangdong Academy of Agricultural Sciences. These varieties have been designed to meet the growing demand for high-quality, sweet corn that is both productive and easy to manage. Yuetian No. 2 has a growth period of 70-75 days, with a plant height of 180-200 cm, an ear length of approximately 20 cm, and a single ear weight of around 350 grams. Yuetian No. 3, on the other hand, has a slightly longer growth period of 70-80 days, with a plant height of about 180 cm, similar ear size, and a slightly heavier single ear at around 400 grams. Both varieties exhibit strong resistance to storage, minimal baldness, and are well-suited for large-scale farming and mechanized production.
The seeds are plump, uniform in appearance, and golden in color, making them highly marketable. They also show strong resilience to environmental stress and adapt well to various conditions. The yield per mu can exceed 1,000 kg, making these varieties a promising choice for farmers looking to maximize their output.
When selecting a planting site, it's important to choose a field that is at least 400 meters away from other corn types to avoid cross-pollination. Alternatively, stagger the sowing dates to achieve this. The soil should be loose, deep, fertile, and well-drained, with proper crop rotation to maintain soil health. After preparing the land, ensure the soil is thoroughly tilled and leveled to improve water retention. It's also essential to create a good drainage system, including three ditches: a cross ditch, a ring ditch, and an outer drainage ditch.
For planting, use a double-row layout with a width of 1.3 meters. The spacing between rows should be 55-60 cm, and between plants 35-40 cm. Sow two seeds per hole at a depth of about 3 cm. The planting density varies depending on the season: 2,800-3,000 plants per mu in Spring, and 3,000-3,200 in Autumn and Winter.
Fertilization is key to achieving high yields. Apply organic manure as a base fertilizer, along with superphosphate, and mix it into the soil before planting. Use compound fertilizers during the early growth stages to control pests. A small amount of compound fertilizer can also be applied directly with the seeds. Topdressing is necessary at different growth stages—such as after seedlings emerge, during the jointing stage, and when the tassels appear. Use quick-acting nitrogen, phosphorus, and potassium fertilizers, and consider foliar sprays like zinc or potassium dihydrogen phosphate if needed.
Field management includes timely transplanting, weeding, and soil loosening. Remove any tillers that develop to ensure better ear development. Water management is critical—keep the soil moist, especially during the tasseling and silking stages. Avoid drought or waterlogging, as both can significantly reduce yield.
Weed control should begin immediately after sowing, using herbicides like chloriminate or atrazine. Insect control is also essential, particularly for underground pests like ground beetles. Use appropriate insecticides and rodent control methods during the early stages. Later, focus on controlling corn borers using biological agents like Trichogramma or Bt-based products. Disease prevention involves monitoring for leaf spot and sheath blight, which thrive in humid conditions. Apply fungicides as needed, and avoid using toxic pesticides that could harm consumers.
Finally, harvest the corn when the sugar content is highest—around 20-25 days after pollination, during the milk ripening stage. This ensures the best flavor and quality for the market. With proper care and attention, these varieties can deliver excellent results for farmers in Guangdong and beyond.
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