Broccoli Double Ball Cultivation Technique

First, the selection of varieties. The cultivation has been successful with high-quality varieties such as Green Male 90 and others, which show excellent growth performance and yield potential. Second, early sowing is essential. Delayed harvesting can cause a growth pause, pushing the harvest period back by 8 to 10 days. To maintain the same harvest schedule, sowing should be advanced by approximately 6 days. Third, the topping method plays a crucial role. To avoid affecting plant growth, a light fertilization should be applied three days before picking. Using 0.5 kg per acre of 45% compound fertilizer in the seedbed ensures proper nutrition for the plants. During the seedling stage, it's recommended to remove four true leaves and leave two. Each seedling should have two lateral shoots, allowing each plant to form two flower balls after transplanting. Topping should be done on sunny days to reduce the risk of infection. Additionally, topping should be carried out in batches based on seedling size. All other nursery management practices remain consistent with traditional methods. Fourth, de-budding is important. To ensure the development of double flower balls, all buds must be removed before the mid-growth stage. One round of de-budding should be done before transplanting, followed by another on the 15th and 30th days after transplanting. Fifth, the planting density is critical. Experiments have shown that increasing the density significantly reduces the weight of individual flower balls, decreases the diameter, and makes the flowers thinner. At a density of 2200 plants per acre, the flower balls become too small to be commercially viable. For optimal double-ball cultivation, a density of 1800 to 2000 plants per acre is recommended. This balance ensures good flower ball quality and higher yields. Sixth, fertilizer and water management must be adjusted. Under double-ball conditions, the fertilizer application should be increased by about 20% compared to conventional methods. This helps support better growth and development. Other fertilizer practices remain similar to traditional approaches. Seventh, the production effect is impressive. The double-ball rate can exceed 90%, adding 700 to 900 flower balls per acre. The growth rate is around 80%. Additionally, the flower balls are more colorful and well-shaped, making them ideal for fresh exports. Eighth, the application prospects are promising. Although double-ball cultivation requires additional labor for topping and de-budding, and increases fertilizer use, it also reduces seed costs. The total cost per acre is approximately 50 yuan, but the economic return exceeds 600 yuan, resulting in an input-output ratio of 1:12. This makes it highly economically beneficial.

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