Summer cabbage is actually a Chinese cabbage that is listed between summer and autumn. At this time, the vegetable supply season is low, and the economic benefits are considerable. However, due to high summer temperatures and heavy rain, it is a season with high incidence of pests and diseases. Therefore, it is often necessary to select varieties with short growth period, compact plant shape, heat resistance and disease resistance, and adopt suitable cultivation measures such as planting, grasping planting density, and strengthening fertilizer and water management to achieve stable yield and high yield. 1 variety selection Summer cabbage varieties are characterized by heat resistance, wind resistance, antiviral disease, soft rot resistance, glare resistance, moisture tolerance, short growth period, high vegetable yield, high yield and quality. The current production mainly uses the hybrids introduced by Xiayang and Japan; the domestic breeding varieties include heat-resistant white 45 days, Qingxia 3, and early maturing 7 varieties. 2 suitable sowing Appropriate sowing is the prerequisite for ensuring Miaoquan, Miaoqi and Miaowang. Sowing from mid-May to early July. Choose land with high terrain, convenient drainage, loose and fertile soil, and organic matter. The whole land requires intensive cultivation, and the seeding ditch or the bottom of the hole is relatively flat. The covering soil is mainly loose and fine soil, and it should not be too thin or too thick. Generally, high ridges are used for live broadcast, with a ridge distance of 50 cm, a row spacing of 40 cm, and 3,000 to 3,300 plants per 667 m2, which are reasonably densely planted. Before sowing, first soak the seeds in cold water for 1 h, remove them into 0.3% potassium permanganate solution for 30 minutes, rinse with water, germination and sowing; or mix seeds with 50 g of Fengling every 667 m2 to soak the seeds. Wet and then add the drug and mix well to prevent soft rot. After sowing, water the water in the furrow, but the water should not flow over the ridge surface, so as to avoid the formation of soil surface and affect the emergence of seedlings. Cabbage shoots are most afraid of sun exposure, usually in the evening or afternoon sowing, so that the shoots are unearthed after 2 days. 3 Field management After sowing, when underground pests such as ground tigers are found, they should be sprayed with enemy killings and other chemicals in time to ensure seedlings. After sowing for 3 to 5 days, the seedlings can be released. After the emergence of the seedlings, the early seedlings (divided seedlings), the late seedlings, and the strong seedlings. Striping and hole sowing generally require 3 seedlings. The first time in the heart leaf occurs (such as not overcrowded, but not in the case), the second time in 2 to 3 leaves, the third time in 5 to 6 leaves when the seedlings. Because the growth period of summer cabbage is short, it is generally not seedlings, the fertilizer and water are promoted to the end, the weather is dry and rainless, and a small water is poured every 2 to 3 days. Watering in the evening, it is advisable to flood the ditch, and no water can flow over the surface. Otherwise, it is prone to disease. Summer cabbage grows vigorously, and the demand for water and fertilizer is large, but it is not resistant to cockroaches. It is timely watered and loosened. When there is water in the rainy field, it should be discharged in time to prevent the seedlings from being affected by the water. In order to reduce the occurrence of diseases and the lack of certain elements in the soil, avoid continuous cropping with cruciferous crops, and the growth period of summer cabbage is short, and it is necessary to re-apply organic fertilizer. 4 Pest control The disease and insect pests of summer cabbage are heavier, and it is necessary to find early prevention and treatment, prevention, and supplemented by medicine. 4.1 downy mildew The disease is a common fungal disease, and when planted, the plot often rotates. After the onset, it can be sprayed with 58% metalaxyl manganese-zinc wettable powder 500 times solution or 70% propionate zinc wettable powder 700 times solution, sprayed once every 7 to 10 days, and even sprayed 2 to 3 times. 4.2 Soft rot The disease is a bacterial disease. It is necessary to ditch the drainage when the land is prepared, apply the decomposed farmyard manure, and increase the application of phosphorus and potassium fertilizer. Before the onset or at the onset of the disease, spray 72% of the agricultural streptomycin sulfate soluble powder 4 000 times solution. When spraying, focus on the light diseased plants and the surrounding plants, and pay attention to spraying the petiole and stem base close to the surface. Remove the diseased plants in time to reduce the source of the bacteria and prevent the spread of the disease. 4.3 viral disease To prevent and treat viral diseases, we must first select resistant varieties, followed by strengthening field management, reducing human exposure to poisoning in production, cultivating strong seedlings, enhancing disease resistance of seedlings, and controlling aphids. In the early stage of the disease, it can be sprayed with 20% virus A wettable powder 600 times liquid and 500 times liquid vinegar, which can prevent disease and prevent aphids. 4.4 Black spot, white spot disease These two diseases are mainly harmful to the leaves. When raising seedlings, it is necessary to choose varieties with good disease resistance in summer and autumn; strengthen field management, do a good job in field sanitation, and ditch drainage. At the time of onset, 100 to 150 g of mancozeb (80% wettable powder, 75% water-dispersible granules) can be uniformly sprayed with water of 45 to 75 kg per 667 m2. 4.5 Locust The control of aphids can be induced by yellow plates, and it can also be sprayed with imidacloprid to kill insects. 4.6 rapeseed meal, cabbage caterpillar It is strictly forbidden to use highly toxic and highly toxic pesticides when controlling rapeseed meal and cabbage caterpillar. In the early stage of pests, 1.8% avermectin EC and 2.5% beta-cypermethrin EC can be sprayed, which has good control effect on these two insect pests. 5 timely harvest Due to the high temperature and high humidity in summer, cabbage can be harvested when it is mature. Harvested too late, easy to convulsion, while too tight leaf ball is hot or rainy and perishable. The specific harvesting time can also be determined according to market conditions, and strive to collect and market when the price of Chinese cabbage is high, in order to obtain better economic benefits. The above is the whole content of summer Chinese cabbage cultivation technology, welcome everyone to come to Hui Nong network to learn related technology! covid19 Anesthesia Medical Co., Ltd. , https://www.trustfulmedical.com
