First, the choice of soil should be deep soil, loose fertile soil and well-drained sandy loam soil. Clay, saline-alkali soil, alfalfa land and white soil are not suitable for planting. Second, use ridges for soil preparation in the autumn, 25-30cm depth, 60-65cm ridge width. Third, sowing fertilization sowing period from late April to early May. The seeding method uses ridge cultivation to widen the sowing. That is to say, bricks can be picked up on the roof and the bricks can be widened and the trenches can be flattened. Then apply filtered manure, apply 1,000 kilograms of farmyard manure per 667 square meters, step on the bottom grid, then sow the soil, soak 2 kg per 667 square meters, cover soil 2-3cm thick, step on the grid, which will help to ensure the protection, ensure Whole seedlings. Fourth, field management 1, seedlings Dingmiao seedlings after the Qi and time seedlings Dingmiao. Seedling height 3-4cm seedlings, plant spacing 5-6cm, seedling height 7-8cm Dingmiao, plant spacing 10-12cm, leaving into the abducted seedlings. When the seedlings should be rooted, do not pull off the seedlings to prevent regeneration, affecting growth. 2, when weeding and weeding, we must combine the removal of weeds between the seedlings. After cultivating the seedlings in a timely manner, the hoeing is usually performed 3 times. 3, top dressing can be carried out in late June, chasing 20 kg of calcium phosphate per 667 square meters, top dressing in the root side, combined with the fertilizer to cover, to prevent loss. 4. Irrigation and Drainage If the weather is dry after sowing, irrigation should be performed in time to ensure the growth and development of seedlings and seedlings. When the rainy season arrives, it is necessary to pay attention to drainage and prevent the accumulation of water. V. Pest control 1. Powdery mildew damage leaf blade handle. The leaves have small yellow-green spots, white floc, protruding leaves, and the leaves turn brown and die. Prevention and cure method for rotation before the use of cruciferous crops; with biological pesticides 2% agricultural anti-120 water agent or 1% Wuycin water agent 150 times spray, spray every 7-10 days, even prevention 2-3 times . 2. The downy mildew leaf is faded, the lesion expands to a polygonal shape, yellowish brown to dark brown. The whole leaf curls dry. The method of prevention and control is a reasonable rotation, and the well-drained land is planted; sprayed with 75% chlorothalonil WP for 600 times and sprayed 3 to 4 times. 3, Sclerotinia disease on the surface of the lesion with water-like lesions, rot, black sclerotia, like rodents. The prevention and treatment methods were rotated in a rational way, and phosphorus and potassium fertilizers were added; the
Plastic Film was covered to prevent the release of spores and the source of disease was reduced; 50% carbendazim wettable powder was used 500 times, sprayed once every 7-10 days, and sprayed 3-4 times. 4. In the initial stage of root rot, the leaves turned brown and wilted. The roots are rotten, rancid and odor, and the plants die. The prevention and treatment methods were selected for the cultivation of well-drained plots and the drainage during the rainy season. The initial stage of the disease was to use 5% lime water to irrigate the roots. During the growth period, the diseased plants were found to be removed and burned to disinfect the soil. 5, cabbage butterfly larvae eat leaves, eat a short cut, when serious eat only leaves veins. Control methods to remove weeds in the field, reduce the ground overwintering sites; black light in the field, trap and kill adult; spraying 40% wolfberry cream 1000 times or Bacillus thuringiensis preparation 500-600 times liquid. 6. The locusts harm the back of the orchid leaf, sucking leaf juice, yellowing the leaves, and shrinking the leaves. The control method uses 1.5% ergo powder, with 1500g per 667 square meters, spraying in the morning when the dew is not dry. Sixth, harvesting and harvesting leaves should be divided into secondary harvests, and the first time in the middle of August, 30% of all the leaves should be collected. The second time harvested all the blades in the middle or late September. It was taken in late September. The leaves were harvested from the bottom, with the right thumb and the second thumb holding the petioles, squeezing down forcefully, squatting down and placing them on the ridge tables and returning them for processing. The root pick should be selected on a sunny day, with manual or mechanical collection. Artificial ridges are excavated with iron rakes or deep ploughs are used to remove all the roots. Remove the mud in the field and return it for processing.
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