Summer cultivation means that the sowing date of Chinese cabbage is before the autumn, and the germination period and the seedling stage are in the hot summer. At this time, the weather is changeable, or the temperature is high or dry, or the rain is continuous, which has adverse effects on the growth and development of Chinese cabbage. For example, the plant grows weak, has poor resistance, and is susceptible to various diseases. In severe cases, it causes reduction or even rejection. Summer is also the peak period of locust activity, which harms the formation of wounds in Chinese cabbage and is the main channel for virus infection. Practice has proved that in order to obtain high yield, high quality and high efficiency of Chinese cabbage, the following key technical measures must be taken.
 First, due to local conditions, the selection of resistant varieties of summer Chinese cabbage cultivation, must use disease-resistant, heat-resistant, high-yield, early-maturing varieties, such as Lubai 6 , Xiafeng, Xiaoza 55 , Xiaoza 56 , Lu White No. 8 , Feng Kang 70, etc.
 Second, the sorghum deep ditch, the base of the fertilizer , the large leaf area of ​​the cabbage, the demand for water is large, but the resistance is weak. In summer, the amount of rainwater is large, and sometimes it is high temperature and drought. Therefore, it is necessary to adopt deep sorghum and sorghum, so that sputum can be discharged and dry can be irrigated. In order to avoid sputum area water, it is necessary to use short hoe cultivation, and the length of pupa is generally not more than 15m . Summer cultivation has a short growth period and high yield, and the base fertilizer should be applied. About 5,000 kg of mashed and cooked manure . The ratio of N , P , and K is about 2 : 2 : 3 . Do not apply nitrogen fertilizer, otherwise it will cause long, disease resistance, disease, heavy, resulting in reduced production and income. The organic fertilizer as the base fertilizer must be fully decomposed and properly applied.
 Third, early sowing, sowing cabbage scaffolding shade in summer in Huaibei area is generally July 15 to August 1. Usually broadcast or hole broadcast. Drilling with the kind of volume per 667m 2 150 ~ 200g, for Bunch 2 125 ~ 150g per 667m. In order to timely seeding in advance, cooling and moisturizing, and reducing the harm of viral diseases, shading seedlings can be used, that is, a straw curtain or a sunshade net can be used to form a 60cm high semi-shade to reduce the sun exposure. The seedling age is generally no more than 20 days, and the three or four true leaves are fixed. When starting the seedlings, bring as much soil as possible, and less damage to the roots. The planting should be carried out in the afternoon or on a cloudy day to benefit the living tree. One week after living the tree, it is necessary to check the lack of seedlings in time, check and make up, and strive for Qi Miao and strong seedlings.
 Fourth, strengthen field management, do a good job in disease prevention and treatment from the emergence of the first ring to the seedling stage. In this period, the first is to grasp the management of seedlings, that is, between the seedlings, the seedlings, the seedlings, and the seedlings; the second is to grasp the soil management, that is, watering, loosening, weeding, etc.; the third is to catch disasters, that is, spraying drugs to prevent pests and diseases. If the weather is dry and rainless, pour a small amount of water every two or three days to prevent the ground temperature from being too high to burn the seedlings; if the weather is rainy and watery, it should be removed in time to prevent the seedlings from being stained and debilitated. The period in which the second and third leaf rings of the seedlings are formed is the rosette period. This period is mainly to strengthen the management of fertilizer and water, to ensure sufficient fertility, so that the leaves of the rosette are large and thick, thick green and shiny, and it is necessary to properly control the water seedlings to prevent the outer leaves from growing. The management measures during the balling period are heavy fertilization and watering. Do not flood with water to prevent soft rot and downy mildew. Nitrogen, phosphorus and potassium fertilizers should be applied together, and no nitrogen fertilizer should be applied. Generally, the per mu manure and manure are 3000~5000kg , the rapeseed cake is 100kg , and the NPK compound fertilizer is 25kg . If necessary, the plant ash can be added as appropriate. Aphids are the main source of infection for viruses. High temperature and drought are conducive to the breeding activities of aphids, and the amount of occurrence is large. After emergence of Chinese cabbage, every 5-7 days, alternately spray with 40 % dimethoate 1000 times solution and 20 % pyrethroid 4000 times solution.
 V. Timely harvesting, the high efficiency of the listing is basically formed in the Chinese cabbage leaf ball, which can be harvested when it reaches eight matures. At this time, the market vegetables are monotonous and the price of vegetables is high. This cabbage can meet the needs of the market, ease the contradiction in the off-season, and obtain higher economic benefits.
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Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
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