There are not many vegetable farmers who use winter-heated plastic greenhouses to cultivate autumn and winter tomatoes in North China. This model puts the fruit supply period exactly during the period from the New Year's Day to the Spring Festival. How to manage the autumn and winter tomatoes need some "tips" to introduce as follows: The bottom fertilizer should be lightly applied with topdressing to promote yield The most common winter-heating plastic greenhouses in North China are to cultivate 2-3 crops a year, the most important ones are autumn and winter sorghum and winter spring sorghum. Mature greenhouses have become extremely fertile after years of organic fertilizer and fertilizer input. Empirical data: 8 years old mature sheds suggest that the autumn and winter 茬 tomato base fertilizer with chemical fertilizer 50 kg / mu or so formula with potassium sulphate type high phosphorus compound fertilizer is better (such as 12-18-15) the shorter the shed age, the higher the maximum limit 150 kg / mu. In addition, in autumn and winter, the temperature in the seedling stage is suitable for growing in the seedling stage, and the base fertilizer can be used less or without organic fertilizer. The organic fertilizer allows the winter spring to play the role of lifting the ground and maintaining the high yield because the planting period of the dragonfly is low in the winter. According to the number of spikes of long fruit, the amount of topdressing is determined to focus on the yield of topdressing. If a total of 6 spikes can be added, the topsoil can be topdressed 3 times when the first, third, and fifth ear fruits are inflated; if a total of 4 spikes are added, the topsoil will be topdressed twice when the first and third ear fruits are enlarged; Topdressing 1 time. The top dressing with potassium sulphate type compound fertilizer is better with high nitrogen, low phosphorus and high potassium (such as 18-8-18) and 40-60 kg/mu per mu. When the ground temperature is low, it is better to mix the organic matter such as fulvic acid to buffer the effect of the purified fertilizer on the ground temperature and root system. Provide full nutrition soil to be healthy Among the trace elements, the demand for tomatoes is calcium, magnesium, boron, zinc and iron. To supplement them, we must carry out three aspects: one is the second, the second is the third is the foliar spray. The bottom is supplemented with optional superior boron Zn, silicon calcium magnesium, calcium magnesium phosphorus, and sapphire iron fertilizer. After the supplement with the compound fertilizer, the optional Ciba Boron Zinc, Youli Boron Zinc, and Ammonium Nitrate Calcium may be selected. Foliar spray can be supplemented 2-3 times to choose Kangpu calcium magnesium boron, suspended zinc, liquid calcium, green and so on. It is useless to use the dosage according to the instructions. In addition, to ensure the health of the soil, it is effective to prevent soil-borne diseases. It can be used to adjust the soil or mix fine soil with 1200 kg per mu in the planting hole. Three benefits of preventing disease are guaranteed Bacterial diseases (leaf leaf disease and marrow necrosis), late blight and gray mold are the three main diseases of autumn and winter tomato. Good prevention and control is the guarantee of benefit. Bacterial leaf spot control is based on seed treatment. The initial stage of the disease can be treated with 3000 (or Longke, acacia, and nitro-humate). Bacterial myeloid necrosis is a major prevention of soil-borne diseases to enhance soil conditioning and increase bacterial fertilizer. The treatment consists of water-control, root-rooting, and foliar spray-stimulated rooting agents as the main measures. The root-cropping agent is the same as the high-efficiency foliar fertilizer containing alginic acid, such as Kepke. The prevention of late blight, Baitai, Yinfali or anti-virus cockroaches sprayed once 10-15 days before the onset of the disease generally does not occur late blight. When sporadic occurs, first use rapid-acting therapeutic agents (such as Anke, cymoxanil, mildew, etc.) to control the development of the disease and then spray Baitai, Yinfali, etc. to protect. Botrytis cinerea is one of the key diseases in the flowering period. Its pathogen is a typical weak parasitic bacteria. The environment with low temperature, high humidity and low light is most likely to be infected, propagated and reinfected in areas where crops are corrupt. There are three methods of prevention and treatment: First, clean up dried flowers, dry leaves and other spoilages during farming operations. The second is to prevent the use of chlorhexidine, Harbin trichoderma and other treatments with pyrimethanil and other injections to combine calcium supplementation effect is better. Thirdly, the medicine used for sneezing flowers is added with the medicine for controlling gray mold, such as Shijiale 1000 times (or 1000 times speed of Suo Keling and 500 times of phlegm). Note: In the harsh environment, the low temperature and high humidity spray of the greenhouse will make the humidity control effect greatly reduced. Try the aerosol. Reinforcing Mesh,Wire Mesh Reinforcement,Masonry Reinforcement Mesh Puersen Hardware Wire Mesh Products Co., Ltd. , http://www.sjz-wiremesh.com