1, species selection

Select heat-resistant, disease-resistant, and good-quality cabbage varieties suitable for local high-temperature summer planting and consumption habits, including precocious No. 5, 'Huaguan', 'Xiamei', 'Lion Run' and other heat-resistant green stalks and long stems. White and so on.

2, soil treatment

Pakchoi has a high requirement for soil, and when the former crops are timely hauled into the clear gardens, if the crops are damaged at the end of the crop harvesting and diseases are heavy, lime and fungal pesticides should be used for soil disinfection. If there is serious secondary salinization in the shed soil, apply large-scale flood irrigation to irrigate salt, build soil around the greenhouse before irrigation, make it higher than the surface of the soil, and soak the water when immersing the surface of the soil. If the shed film is not removed The entire greenhouse can be sealed for 7 days. The high temperature in the greenhouse can be used to kill some of the bacteria in the soil. If the conditions permit, it can be combined with the use of calcium cyanamide (lime nitrogen) to disinfect the soil. The effect will be better and the soil will be soaked for several hours. After the water is drained off and repeated several times, the surface soil can be desalted 50~60%.

Soil-heavy paddy soil was changed to vegetable land and soil improvement must be performed first. In the period of 1 to 5 months before planting leafy vegetables, select organic fertilizers such as pig manure, duck dung, chicken manure, etc. that meet the pollution-free standard of organic fertilizer or commodity organic fertilizer, and adopt the deep-turning method with the usage of 4000-5000 kg per mu. Apply evenly into the soil.

3, soil preparation, basal fertilization, loading net coating

The soil is most suitable for sandy loam and loam, and it is close to the water source for irrigation. Each mu of land full of cooked manure and compost 1000 ~ 1500 kg or 45 ~ 75 kg of special fertilizer for vegetables, soil preparation after the ridge to do the rake, the width of 1.2 ~ 1.5 meters. Before the cultivation of the greenhouse, do not remove the shed, leaving the top film, remove the skirt film, and cover the insect net in the original position of the skirt film; if conditions allow, can also be used insect nets full shed coverage cultivation. Sheds covered with insect-proof net membranes should minimize the area covered by the top membrane. China Agriculture Network recommends increasing the area of ​​insect nets, increasing the ventilation in the sheds, preventing the over-temperature in the sheds from causing shrinkage of the cabbage leaves and affecting the quality of the cabbages. . Or cover the net in the roof to make the cabbage grow normally.

4, sowing

Popping water before sowing, using live broadcast or broadcast. Mu seed volume is 500 to 1000 grams. After sowing, it is covered with a thin straw or shade net. Generally no longer watering before emergence, if the weather is dry, sooner or later, spray water and other coverings such as straw or shade nets.

5, field management

(1) Weeding

2 to 3 days after sowing, the seedlings were peeled off in time after emergence, and the first seedlings were grown when 1 true leaf was grown. It is not too late to go to the dense seedlings. When the four true leaves were grown, the second time the seedlings were planted, and the weak seedlings and diseased seedlings were in between. At the same time, the market conditions could be combined to start the seedlings listing. While removing the seedlings, remove the weeds.

(2) Fertilizer management

After the seedlings are watered 1 or 2 times a day, they should be poured with small water, run water, avoid flooding and watering in sunny days, and can also use micro-irrigation facilities sprinkler irrigation and fertilization. Generally when the first time in 3 leaves and 1 heart, the top dressing, according to the soil fertility conditions and the growth potential of the seedlings as appropriate to determine the top dressing time, frequency and amount of fertilizer, usually urea per acre of 5 to 10 kg, spread evenly on the surface.

(3) Disaster Weather Management

In the rainy season, drainage should be drained in a timely manner to control the accumulation of stagnant water in the shed, causing the death of the roots of the cabbage. In the event of a rainstorm, preventive work should be done in accordance with weather forecasting. In hot and dry weather in summer, water should be poured in the morning and evening to infuse horse water. On the one hand, it fully meets the demand of water for the growth of Chinese cabbage, and on the other hand, it can regulate the microclimate in the shed and reduce the temperature of the shed.

(4) Pest control

In summer, high temperatures and excessive rainfall cause the phenomenon of dead seedlings, or roots, or soft rot. The fields must be drained and unblocked to prevent the accumulation of stagnant water. The field should be removed from the soft rot in time and used. 8% nannanmycin 1000 times or 20% thifenacetin (Loncobacter) 500 times or 47% buds. Copper oxychloride (Garenon) sprayed 750 times or sprinkled roots to prevent and cure, pumpkin field efficient management technology to spray once every 5 to 7 days. The main pests of summer cabbage are: aphids, cabbage caterpillars, diamondback moth, and whitefly. Due to the use of insect-proof nets plus film or full-insect net covering to insulate foreign insects from invasion, insecticides can be applied at the seedling stage based on the actual insect pests. Cabbage beetle, Plutella xylostella, Spodoptera litura and Spodoptera exigua can use 1 billion. PIB/ml Aoqing No. 1000x or 5% Chlorantraniliprole SC for control; Aphids and whiteflies can be hung by yellow plates or controlled with 70% imidacloprid or 10% nitenpyram or 20% acetamiprid SP . In general, cabbages covered with insect-repellent nets plus film-covered cultivation or full-infestation nets are used to prevent and control pesticides only once at the seedling stage depending on the actual situation, or do not use pesticides.

6, harvest

High-temperature season early maturing on the 5th 20 to 25 days can be harvested, 'Huaguan', 'Summer', 'Lion Run' and other heat-resistant Qingyan 45 to 60 days can be harvested, long stem white generally 35 to 45 days can be harvested, Generally 50 days later, long-stemmed white yield will not increase again, so it should be harvested in time. Generally speaking, per kilogram yield of Chinese cabbage is about 2000 kilograms.

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