After entering April, cold spring cauliflower will gradually enter the bulbous expansion period, this stage is the critical period for the formation of cauliflower production. Technical management points at this stage include:
Water and Fertilizer Management After the spring cauliflower enters into the bulb expansion phase, the growth rate is accelerated, and the demand for water and fertilizer is relatively large. The application rate of the base fertilizer and the growth of the field should be used, and the top dressing should be applied 2-3 times, and the NPK fertilizer should be applied to 20 kg of the NPK or K type compound fertilizer. Follow the water. Generally, water is poured once every 7-10 days, once the water is used once, and the amount of water is sufficient.
Covering the leaf ball When the flower ball diameter reaches 5 cm (the size of the egg), break the 1-2 outer leaves close to the flower ball to cover the flower ball to avoid direct sunlight and keep the ball white. When the cover leaves are wilted and yellow, new leaves should be replaced promptly.
The major pests and diseases in the production of spring vegetables for disease prevention and control are downy mildew, soft rot, diamondback moth and cabbage worms. The downy mildew mainly damages the leaves and produces irregular or polygonal lesions, which are sprayed with 72% Kelu wettable powder 600-800 times. Soft rot spreads from the base of the leaf to the stem and roots, causing plant rot to stink. Use agricultural streptomycin 2 million times liquid, or neophytin 2 million times liquid to root or spray. Cabbage butterfly, also known as cabbage butterfly, can be sprayed with 50% phoxim 2000 times solution. Plutella xylostella is also known as the hanging threadworm, and the larvae are used to injure the leaves. The control method is sprayed with avermectin emulsifiable concentrate 1000-3000 times solution or 5% Suppressor 1000-2000 times solution.
Timely harvesting When the cauliflower and flower bulbs are fully grown, the surface is round and the edges are not yet loose, it is the best time for harvesting. Generally, early-maturing cultivars can reach 10-15 cm in diameter, and mid-to-late-maturing cultivars can reach 25-30 cm in diameter. When harvesting, generally leave 2-3 leaflets to protect the curd.
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