First, prepare before broadcast

1. Variety selection Anti-disease varieties, high ridge cultivation. The currently well-tolerated varieties include Beijing New No. 3, Fengkang 80, and Taiyuan Erqing.

2. For scientific manure, the nitrogen requirement is greatest in the growth of Chinese cabbage, potassium is the second, and phosphorus is the least. The absorption ratio of the three elements is about 4:1:3. The basic rules for nutrient absorption are: Before the rosette stage, Nitrogen dominates, followed by potassium, and potassium dominates during the ball stage, supplemented by nitrogen, so base fertilizer must be applied. Before the selection, there was no plot of cruciferous vegetables, combined with 5000-6000 kg of farmyard manure in Mushi, and 10 kg of ammonium phosphate, which could increase the disease resistance of the plant.

3. Seed 1 seed dressing, seed disinfection can effectively control soft rot, black rot. Soft rot: Seeds soaked with 3% potassium permanganate before sowing. The seeds were soaked in cold water for 1 hour, and soaked in the liquid for 30 minutes. The water was rinsed, germination was sowed, or Zhuangfengling was used for seed dressing of 50 grams per mu. Black rot: soaking in warm water at 50°C for 20-30 minutes or streptomycin 1000 times for 2 hours, and sowing after drying. 2 Sowing period: Generally 3-5 days after the beginning of autumn. Generally, seeds are sown from sowing to sprouting for 24 hours, so they should be sown in the afternoon so that the seedlings can be unearthed in the early evening of the third day after sowing. After a night's growth, they can tolerate a stronger sun.

Second, field management

1. Seedlings, supplementary seedlings, timely seedlings from the seed germination to Dingmiao, the general seedling age of about 18 days, should be repeated between the seedlings. The seedlings were unearthed for 3 days for the first time. The seedlings were separated and 4-5 leaves were planted for the second time, leaving 2-3 plants per hole. According to the strength of the seedlings, leaving strength to weak, when the leaves grow to 8-9 leaves, according to the spacing of about 50 cm from the planting seedlings. The timing of seedlings should be controlled at high temperatures in the noon. Due to the different ability to adapt to the environment, some weak seedlings and diseased seedlings show their morbidity and are easier to identify and eliminate. If there is a shortage of seedlings, it should be replanted promptly.

2. Intertillage and weeding are carried out in the mid-stage of Dingmiao and Rosettes respectively. According to the principle of “shallow head, shallow depth, and deep roots”, high ridge cultivation should follow the principle of “deep sewers and shallow rakes”. , Combined with cultivator turfgrass soil, such as Rosette late growth, can be seedlings.

3. Watering topdressing fertilizer, such as the use of less, can be a fertilizer in the seedling period. Mushi urea 10 kg. In the rosette period, the beginning and the middle of the ball stage, each fertilizer is chased once, and 15-20 kg of urea is applied per mu, which is a combination of foliar potassium dihydrogen phosphate and urea sprayed once every 10 days. Watering should be carried out in conjunction with topdressing. The soil in the early stage of the ball is dry and wet, and the soil is moist during the ball stage. Stop watering until 10-15 days before harvest to facilitate storage.

4. Ten days before the harvest, the outer leaves shall be raised and wrapped with wheat straw or straw to prevent the frost damage or mechanical damage before harvest. Late-maturing varieties extend the growing period as much as possible, but must be harvested before frost.

Third, pest and disease control

1. Earthworms, cockroaches and soil pests are evacuated with 2.5% methyl isophorus powder evenly on the ground or baited with 50% methamidophos, wheat bran and cottonseed cake. .

2. Downy mildew can be sprayed with 75% chlorothalonil 500 times solution or 60% fluomodin zinc 500 times solution, sprayed with agricultural streptomycin or 70% dextrin to irrigate diseased plants and the surrounding plant roots to prevent soft rot disease. Timely control of aphids can reduce viral transmission vectors. Antivirus disease uses 3% force to kill enemy sprays. It can be sprayed with 1.5% of Shiyiling II or virus A800-1000 times at the beginning of the disease.

3. Pieris rapae, Plutella xylostella can be controlled by 3000-fold spraying of pyrethrins or avermectin EC.

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