Coriander is a cold-tolerant vegetable, and it is cool and cool. The optimum temperature for growth is 12°C to 26°C, but the heat resistance is also strong. Coriander does not require strict soil, but loam with high organic content is more conducive to the growth of coriander. The coriander planted in the open field in the autumn has entered the peak season, and management should focus on the “five preventionsâ€. First, prevent weeds Usually the whole growing season loose soil, weeding 2 or 3 times. The first time in the top soil of the seedlings, with a small forceps to break the soil loose soil, eliminate the hardened layer. At the same time weed out the unearthed weeds in order to facilitate the growth of seedlings. The second time when the seedling height is 2 to 3 cm, the drill can be used to properly remove the weeds. The third time is when the height of seedlings is 5-7 cm. Early weeding can promote vigorous growth of seedlings. After the leaves are sealed on the ground, no matter what they are sowing or sowing, they are no longer cultivating tillage. However, we must pay attention to controlling weeds. At this time, special weed herbicides for parsley can be used for chemical weeding. Second, prevent rotten heart If there is more rain, it will be very harmful to the newly emerged parsley. After the heavy rain, it suddenly turned green and could easily lead to rotten parsley. After the rain, then gently pour the well water, the amount is not to submerge the seedlings is appropriate, spray a new high-fat film once, can prevent rotten coriander. Third, anti-convulsions The cilantro planted in the open field in the autumn, although not convulsed by low temperature during seedling stage, but it will be convulsive due to long days, which requires the choice of production-resistant cilantro varieties. In addition, the management of fertilizer and water should be strengthened. Small water should be poured during the whole growth period, and watering should be done 5 to 7 times. When water is to be poured, the light will be used to raise the seedlings, applying about 10 kilograms of urea per acre. After that, each time the water is poured, 2 to 3 times of water will be used to recover urea, which is 10 to 12.5 kilograms per mu. Spraying 800 times the new high fat film once can reduce the occurrence of convulsions. Fourth, anti-red stalk The red stalks of coriander, that is, the stems and leaves of parsley are changed from green to red, which reduces the commercial value of parsley and the purchase price is greatly reduced. The cilantro cultivated in the open field in the autumn, the stems and leaves will be exposed to strong light and turn red, especially when the seedlings are too late (plant height exceeds 8 cm). To prevent red stalks from appearing in the parsley crop, first, seedlings in the morning and a new high fat film should be sprayed once per seedling. In the production, seedlings should be grown to a height of 3 cm in height, and the spacing between the seedlings should be kept at about 2 cm. The second is to properly cover the shade net according to the light conditions. The third is anti-frost. Before the advent of frost, spraying gibberellin can effectively prevent the frost stalk phenomenon. Fifth, the lack of hormones During the growth period of coriander, spraying Jin Tailong chaffy treasure, vegetable strong stem, new high-fat membrane, etc. can promote the flow of cell protoplasm, play a significant role in green leaves, enlargement, can make thick coriander stalk, leaf hypertrophy, fresh leaves, plants Lush, strong natural taste. At the same time, it can improve anti-disaster capacity, reduce the amount of pesticides and fertilizers, reduce residues, and prevent physiology and nutrient deficiency diseases such as leaflets, yellowing, coarse shrinkage, and leaf rolling. Http:// Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesia.com