The planting varieties of spring cabbage in southern Anhui Province generally use Zhonggan 21, Zhonggan 15, etc., and the growth period is 55-60 days. Planted in early March, harvested around May 1st, the benefits are higher.
The spring cabbage is used for 3800-4000 seedlings, and the film is covered immediately after planting and the water is planted. After the seedlings are selected, the weather will be fined and the seedlings will be released. When the average temperature reaches 18 °C ~ 20 °C, the leaves and roots will grow rapidly. At this time, the management of fertilizer and water should be strengthened to promote the formation of strong assimilation and absorption organs. The leaf ball lays the Foundation. The specific management measures are as follows:
First, the rosette period
Watering in time after planting, on the basis of applying the base fertilizer, a small amount of quick-acting nitrogen fertilizer should be applied in the early stage of planting water, and ammonium sulfate or ammonium hydrogencarbonate should be applied for 10-20 kg per mu. When the cabbage seedlings are smelted, the amino acid (Jin Tailong) high-efficiency liquid fertilizer 600 times liquid can be sprayed, which not only accelerates the slow seedling and enhances the cold resistance of the seedlings, but also has a good effect on the early maturing and yield increase of cabbage. When the surface is slightly dry, carry out cultivating and appropriate seedlings. The length of the seedling stage varies from species to species. Early-maturing small varieties, the rosette period is short, and the seedling stage is also short; otherwise, it is long. Early maturing cultivation is generally 10 to 15 days in the seedling stage. When the plants grow vigorously, the leaves are obviously hung with wax powder, and the heart leaves begin to conceal, the seedlings should be finished in time, and then watering and topdressing should be carried out to promote the ball formation.
Second, the balling period
After entering the ball-forming period, the amount of water and fertilizer needed for cabbage is increased, and the management of fertilizer and water needs to be strengthened. When watering, apply high-nitrogen and high-potassium fertilizer 20~25kg, spray watering and fertilizing at the same time, spray amino acid (Jin Tailong) high-efficiency liquid fertilizer 600 times liquid, and add silicone auxiliaries to spray the liquid through the wax. Layer, which is good for leaf absorption. Watering is carried out once every 5 to 7 days, and watering is stopped at 5 days before harvesting.
Third, pest control
The main pests of spring cabbage are cabbage caterpillars and diamondback moths. Cabbage worms mainly feed on leaves, and the leaves are often eaten with scars, and the worms also contaminate the leaf balls. It can be sprayed with 5% emamectin benzoate 6 g or flufenicol biological preparation 1 g against 15 kg of water spray, focusing on spraying the leaf heart.
Plutella xylostella larvae damage leaves and tender stems. The first-instar worms eat the mesophyll, leaving a layer of epidermis. After 3 years of age, the leaves are eaten into holes, and in severe cases, the leaves are reticulated or left. Spraying 15 to 15 grams of water with 1.8% avermectin per acre is good.
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