"Jingyi Youyou Green III" is a newly developed Chinese cabbage variety created through the collaboration between the Vegetable Breeding Research Group at Hebei Agricultural University and the Jingyi Seedlings and Vegetable Research Center. This variety is designed to meet modern agricultural demands with its high yield, disease resistance, and excellent quality.
First, let's explore its key characteristics. "Jingyi Youyou Green III" features tightly packed heads, glossy green leaves, thin outer layers, medium-sized walnut lines, and minimal burrs. The shape of the head closely resembles that of "Beijing New Third," with a plant height of approximately 38 cm and a spread of 60 cm. The head stands about 33 cm tall and is 16.4 cm in diameter. It has a superior texture and appearance, with uniform thickness, making it ideal for packaging and transportation. Additionally, it stores well in winter, grows quickly, and exhibits consistent development throughout the growing cycle, with a growth period of around 80 days. The variety also shows strong resistance to viral diseases, downy mildew, soft rot, and dry heartburn. Each plant produces an average net weight of 4.2 kg, with a vegetable rate of 85%, and yields approximately 10,000 kg per mu.
Now, moving on to cultivation practices. First, it's important to apply a base fertilizer by incorporating about 5,000 kg of well-rotted organic manure and 50 kg of superphosphate into the soil. Second, sowing should be done around 3 to 5 days after the start of autumn, as this variety is typically grown as an autumn crop. Third, planting density needs to be carefully managed. Using a raised bed system, seedlings should be transplanted when they have 2 to 3 true leaves, and then again when they reach 5 to 6 true leaves. The recommended spacing is 40 cm by 55 cm, resulting in a density of 2,800 to 3,000 plants per mu.
Fourth, proper irrigation and fertilization are essential. During the germination stage, maintaining adequate soil moisture ensures good emergence. In general, there is no need for additional seedling care, but in rainy years, drainage must be prioritized. At the seedling stage, nitrogen-rich fertilizers are crucial, and after transplanting, applying 15 to 20 kg of nitrogen fertilizer is recommended. The rosette to heading stage is the most critical for fertilization, requiring regular applications of phosphorus and potassium, about every 8 to 10 days, using 10 to 15 kg of compound fertilizer per mu. Ten days before harvest, stop top-dressing and watering. Additionally, foliar sprays of 0.5% potassium dihydrogen phosphate can be applied 2 to 3 times every 7 to 10 days after the rosette stage, along with two calcium supplements.
Finally, pest control is vital. Following the principle of "prevention first, early treatment," effective management practices such as adjusting planting times based on local weather conditions can help prevent viral infections. High-risk cultivation techniques, proper planting density, and timely drainage all contribute to reducing disease incidence. Regular monitoring and early intervention are key to controlling any outbreaks. When necessary, pesticides like virus A or phytosanitary agents can be used to manage viral diseases, while also focusing on aphid control to reduce virus transmission. For clubroot, products like boxworm, mancozeb, or chlorothalonil are effective. Soft rot can be controlled with agricultural streptomycin or neomycin, and aphids can be managed with imidacloprid or other insecticides. Caterpillars and armyworms can be controlled using BT powder or lespedeza. At the seedling stage, dipterex mixed with bait is recommended to protect against underground pests and earthworms that may damage young plants.
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