In spring, as the temperature rises, the night temperature in the shed is also greatly increased. At this time, improper management of shed vegetables can lead to leggy, high temperature and hormonal intoxication, resulting in problems such as falling flowers, falling fruit, yellow leaves, and premature senescence. The current vegetable management should do six defenses. 1. Prevention of apprehension As the temperature rises, the temperature difference between day and night becomes smaller, and the vegetable plants tend to grow longer, especially for eggplant and melon vegetables. If the plants are too long, they are liable to cause falling flowers and fruit, and even if they have fruit, they are prone to malformations such as empty fruits. To prevent leggy, we must first pay attention to increase the temperature difference between day and night; next, the amount of nitrogen fertilizer application should not be too large, try to increase the application of phosphorus and potassium fertilizers to promote plant set fruit. 2. Improper fertilization After the growth and development have entered the middle and late stages, the plants need to increase the amount of fertilizer, and they are prone to de-fertilization, leading to premature plant failure. While appropriately increasing the number of times of watering and watering, the fertilizer is applied once every 7 days in conjunction with watering. Fertilizers should master the principle of “a small number of times†and avoid waste caused by excessive one-time application of chemical fertilizers, or excessive rooting caused by excessive concentrations. Pay attention to balanced fertilization, and increase the amount of phosphorus and potassium fertilizers to increase the plant's stress resistance. 3. Anti-"cold winter" After the seedlings emerged, the seedbeds were ventilated in time, and the ventilation was gradually increased as the weather became warmer, so that the seedlings of the vegetables could pass the low-temperature training and the cold resistance of the seedlings could be improved. Wind barriers are added to block the cold air and form a special microclimate condition within a certain range to prevent the ground from further cooling. Ditch planting vegetables and cover the mulch. Before the arrival of the “cold springâ€, timely irrigation, to reduce the degree of frost damage; or spraying the water on the surface of the plant can make it slow down the body temperature, increase the atmospheric water vapor, condensation heat, can ease the freezing injury. In the early spring, vegetables can be temporarily heated in the nursery shed or in the production shed to temporarily increase the temperature in the shed to prevent freezing damage. The cold smoke that occurs in the field during the nighttime can effectively reduce or avoid frost damage, but there are two things to note: First, the pyrotechnics should be more dense so that the smoke screen can basically cover the whole garden; second, the lighting time should be appropriate and should be in the upper wind direction. It ignites from midnight to 2-3 in the morning until there is still a smoke screen covering the ground before sunrise. This works best. The cultivator will be cultivated several days before the advent of the cold current. After the rammed soil is loosened, the solar thermal energy can be better absorbed and stored, effectively reducing the freezing damage. 4. Anti-hormone poisoning After the temperature rises, when the vegetables are used for flowering or picking melon, the concentration of the anthers should be reduced accordingly, and the principle of using the hormone concentration limit at high temperature should be used. Excessive use of hormone concentration will often affect the flower bud differentiation, resulting in leaf shrinkage, deformity, growth obstruction, malformation, the current tomato peach fruit and cucumber head cucumber, most of the farmers did not reduce the concentration of thistle or point anthers . After the discovery of vegetable hormone poisoning, it can be sprayed with alizarin lactone or nucleotide 400 times solution for remission. 5. Disease prevention and pest control After entering in March, pests and diseases in the solar greenhouse will generally occur. Prevention-based, comprehensive prevention and control to control the spread of pests and diseases. 1. Disease prevention and control. Cucumber, zucchini, tomato gray mold, can be used 25% flufenacetil fumigant or 40% pyrimethamine suspension 600 times, 50% carbendazim 600 to 700 times liquid, 50% procymidone 2000 times spray Prevention and control; tomato late blight can be chlorothalonil dust agent (1 kg per mu) spray or metalaxyl 800 times, 20% frost Mn Zn wettable powder 600 times spray control; eggplant Verticillium wilt, bacterial wilt Fusarium wilt, canker disease, can be used 77% copper hydroxide, 50% butyl pentamethyl diacid copper 500 times spray control; downy mildew can be used 58% metalaxyl manganese zinc 500 times or 50% chlorothalonil 600 Double liquid spray, continuous 2 or 3 times. 2. Pest control. Greenhouse whitefly and aphids can be treated with buprofezin WP 1500 to 2000 times or 1.8% avermectin 3000 times and 50% chlorimicarb 2000 times spray; 1% avermectin can be used for spotted fly. Emulsion 4000 times or Avi insecticide 1500 times liquid, deltamethrin 2000 times spray control. 6. High temperature barrier After entering late April, the temperature is high and the light is strong, and vegetables are prone to high-temperature disorders such as sunburn. It is suggested that in the recent vegetable management, leaf picking should not be excessive. In addition to anti-high temperature, but also timely foliar spray of boron and calcium fertilizers, in order to promote flowering fruit, prevent umbilical rot and other physiological diseases. Sweetener is a food additive that provides a sweet taste like that of sugar while containing significantly less food energy. Some sugar substitutes are natural and some are synthetic. It allows you to enjoy sweet tasting foods without the extra kilojoules from sugar. It can be beneficial for anyone trying to lose weight and control their sugar intake. Sweetener also does not contribute to tooth decay, as they are not broken down to acid by bacteria in dental plaque. 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