Spring broccoli "ball" prevention method
October 20 11:01:25, 2018
In the production of spring broccoli, some flower bulbs did not grow much, and flowering branches were elongated and scattered early, resulting in loose flower bulbs; while some flower bulbs showed purple green fluffy flowers on the top, and flower buds were visible after a period of time. The entire flower ball is chicken-like. This phenomenon is called "scatter ball." After becoming a ball, the broccoli almost loses its food value. First, the "scatter ball" causes 1. Variety discomfort. Some varieties are weak in winter and are easily vernalized. 2. The growth and development of seedlings are poor. Spring broccoli flower bulb formation must have sufficient leaf area. If the seedling stage is affected by drought or low temperature for a long time, the growth is inhibited and an aging seedling is formed. After the planting, the “scattered ball†appears easily. 3. Implantation period is unreasonable. Cauliflower leaf growth temperature is 8 ~ 24 °C, colonization prematurely susceptible to low temperature, frost, leaf length is not up, the ball is very small, resulting in "scattered ball." The optimum temperature for flower bulb growth is 15-18°C. The colonization is too late. When the flower bulb grows to a high temperature, the flowering branch will rapidly elongate and “scatter.†4. Insufficient fertilizer and water. The broccoli is hi and humid, if the fertilizer is not enough, the leaves grow thin, resulting in a small flower ball and "scattered ball." After flowering, if the soil is dry, it will also "scatter." Second, prevention methods 1. Select winter strong spring varieties. The varieties imported from other places should be used for production after trial planting. 2. Nutrition or plastic bag nursery. The diameter of the nutritional bowl or plastic bag should not be less than 8cm. Seedling temperature during the day to maintain 13 ~ 15 °C, at night 10 ~ 12 °C, to prevent drought, bred 7 ~ 8 leaves, larger leaves, stem thick section short, developed roots, plant height 15 ~ 18cm seedlings. 3. Proper colonization. The middle and late-maturing varieties of spring broccoli in northern Hunan are best. They are sown from October to November, and are planted in open fields in January and February. Timely loose soil, the best use of film and small arch cover cultivation. Clear weather attention to the ventilation management of the shed. 4. Strengthen fertilizer and water management. Before planting, apply 2000-3000kg high quality farmyard fertilizer per 667 square meters, apply 10kg ammonium sulfate per 667 square meters when planting. Pour enough water to set the roots, and then slowly plow the seedlings and pour the seedlings. Afterwards, plow the seedlings. When the diameter of the flower ball is 2~3cm, finish the seedlings. After 10 days, pour a little water again to keep the soil moist. Irrigation dressing 2 times, each time every 667 square meters topdressing 15kg ammonium sulfate or 1000kg human waste. In addition, when the flower bulbs are fully grown and the surface is rounded, the edges must not be scattered yet.