It is necessary to choose heat-resistance, disease-resistance, and early-maturing varieties in order to use unripe varieties of high-temperature, rainy or dry summers to adversely affect the growth and development of summer cabbage. Should choose to under the conditions of long-day high-temperature sunshine, tightly contracted stems, not obvious short-throwing stem elongation, disease resistance, growth period 45 to 55 days of varieties.
The cultivated land was selected for land with high topography, good irrigation and drainage conditions, and loose and fertile soil. Apply base fertilizer, high ridge cultivation. It is best to use garlic, onion, etc. to reduce the risk of viral diseases. Avoid neighboring with virulent virus disease crops such as watermelon and tomato, or use as a forehead. The summer cabbage has a short growth period and fast growth, and more organic fertilizer should be applied to improve the soil permeability and fertility retention.
The timely sowing of heat-resistant summer Chinese cabbage varieties is weak in winter, early sowing can be sown easily, and the ball is smaller; the sowing date is too late to achieve the purpose of increasing production and efficiency. Generally can be planted in stages from May to July, planting ditch on the ridge, determine the distance between planting sowing, 3300 ~ 3500 per mu is appropriate.
Pest control Xia cabbage is susceptible to soft rot, virus disease, aphids, cabbage caterpillars, diamondback moth, cocoon beetles and other hazards are also heavier. Prevention of viral diseases should strengthen watering and seedling protection, timely eradication and weeding, cutting off the route of transmission. To avoid the harm of aphids, a silver-gray shade net can be used to cover the seedlings of the seedlings, and the seedlings are colonized with 5 to 6 true leaves. During the ball phase, attention should be paid to the prevention of soft rot. Liquid medicine should be sprayed on the petiole and stem, and the diseased plants should be promptly removed. Most heartburn diseases are caused by high temperature and drought, and fertilizer and water management should be strengthened.
Fertilizer promotes early fat and water attack, and promotes it in the end. Top dressing should be done a few times. Usually in the seedling stage and after the appropriate amount of irrigation fertilization. At the beginning of the rosette stage and the early stage of the ball-bearing stage, apply bio-organic fertilizer on both sides of the ditch with appropriate amount of high-nitrogen compound fertilizer, and properly cultivate ridges and water them 1 or 2 times.
Plant extracts refer to substances extracted or processed from plants (all or a part of plants) using appropriate solvents or methods. They can be used in the pharmaceutical industry, food industry, health industry, beauty industry and other industries.
Plant extracts are based on plants as raw materials. According to the needs of the use of the final product extracted, through physical and chemical extraction and separation processes, one or more effective ingredients in the plant are obtained and concentrated without changing the effective ingredients. The product formed by the structure. According to the different components of the extracted plants, glycosides, acids, polyphenols, polysaccharides, terpenoids, flavonoids, alkaloids, etc. Are formed; according to different properties, they can be divided into vegetable oils, extracts, powders,crystalline powder, etc.
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