Essentials of Management Techniques for Spring Cabbage

Spring cabbage planting varieties in southern Hebei generally use Zhonggan 21, Zhonggan 15, etc., and the growth period is 55-60 days. Planted in early March and harvested around May 1st, with higher benefits.

There are 3800 ~ 4000 seedlings per acre of spring cabbage, which are covered with a film and watered immediately after planting. After slow seedlings, choose fine weather to punch and release the seedlings. When the average temperature reaches 18 ℃ ～ 20 ℃, the leaves and roots begin to grow rapidly. At this time, fertilizer and water management should be strengthened to promote the formation of strong assimilation and absorption organs. Ye Qiu laid the foundation. The specific management measures are as follows:

I. Rosette

After planting, water in time. On the basis of applying base fertilizer, apply a small amount of fast-acting nitrogen fertilizer early with the planting water, and apply 10-20 kg of ammonium sulfate or ammonium bicarbonate per acre. When the cabbage seedlings are refined, it can be sprayed with 600 times of amino acid (Jin Tailong) high-efficiency liquid fertilizer, which not only has a certain effect on accelerating the slow seedling and enhancing the cold resistance of the seedlings, but also has a good effect on the early maturity and yield of cabbage. When the ground surface is slightly dry, carry out cultivating and squatting properly. The length of the squatting period varies depending on the variety. Early maturing small varieties have short rosette periods and short squatting periods; otherwise, they are long. Early maturity cultivation is generally 10 to 15 days. When the plant grows vigorously, the leaves are obviously hung with wax powder, and the heart leaves begin to clasp, the squatting seedlings should be ended in time, and then watering and topdressing should be promoted to promote nodulation.

2. Knot period

After entering the heading period, the amount of water and fertilizer required by cabbage is increased, and management of fertilizer and water needs to be strengthened. When watering, apply 20 to 25 kg of high nitrogen and potassium fertilizer per acre, spray 600 times of amino acid (Jin Tailong) high-efficiency liquid fertilizer at the same time when watering and fertilizing, and add an organic silicon auxiliary to make the sprayed liquid penetrate the wax. Layer to facilitate leaf absorption. After that, watering will be carried out every 5-7 days, and watering will be stopped in 5 days before harvest to harvest in time.

3. Pest Control

The main pests of spring cabbage are Pieris rapae and Plutella xylostella. Cabbage worms mainly eat leaves, and the ball leaves are often eaten with scars, and the worm droppings also pollute the leaf balls. 6 grams of 5% methylamino avermectin benzoate or 1 g of fipronil biological preparation can be used to prevent and control 15 kg of water, with a particular focus on the leaf heart.

Plutella xylostella larvae damage leaves and young stems. The larvae of the first instar eat the mesophyll, leaving a layer of epidermis. After the third instar, the leaves are eaten into holes. In severe cases, the leaf surface is reticular or leaves are left. Spraying 15 to 15 kg of water with 1.8% avermectin per acre has a better effect.

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