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3、肥水管理:美芹根系肥大,对土壤湿度要求较高,应经常灌水,保持土壤湿润。如水分不足,不但生长缓慢,而且纤维多,容易老化,品质下降。在生长期要适当追施尿素和水粪尿。 4、喷施有机液肥和生长调节剂:为了提高产量和改善品质,在苗期和生长期可喷施天源有机生物液肥300—50O倍,植物动力2003 1 :1000倍二次。也可在采收前15-30天,各喷一次九二○,浓度为100ppm,如配合肥水,将会收到较好的效果。 5、注意覆盖,加强保温和降温工作:美国芹菜的耐寒性较本地芹菜弱,-3℃以下植株易受冻害,栽培时需用大、小棚薄膜覆盖保温。覆盖时间以旬平均气温13℃为下限。秋栽时覆盖不迟于11月上旬。春栽应随栽随盖。最为理想的是大棚内冉套小环棚。当气温低于-5℃,小环棚上还需加盖草帘,或直接在美国芹菜植株上盖一层遮阳网,旧薄膜或无纺布防冻。 美国芹菜抗逆性差。 在高温下易出现“烂心”,从而降低品质。大棚内春栽的,到5月中旬要加盖遮阳网,高温来临前要及时上市。 （三）病虫害防治 斑枯病和蚜虫是美国芹菜的主要病虫害。在冷
3, fertilizer and water management: parsley root hypertrophy, higher humidity on the soil, irrigation should always be to keep the soil moist. Such as lack of water, not only slow growth, and more fiber, easy to aging, quality decline. In the growing season to be appropriate topdressing urea and water excrement. 4, spraying organic liquid fertilizer and growth regulator: In order to improve yield and improve quality, in the seedling and growth stage can be sprayed Tianyuan organic biological liquid fertilizer 300-50O times, plant dynamics 2003 1: 1000 times the second. Can also be 15-30 days before harvesting, spray a nine hundred twenty, the concentration of 100ppm, such as with fertilizer water, will receive better results. 5, pay attention to coverage, to strengthen the work of insulation and cooling: US celery cold resistance than the local celery weak, -3 ℃ the following plants susceptible to frost damage, cultivation requires large, shed film insulation. Coverage time to the average temperature of 13 ℃ for the lower limit. Autumn planted cover no later than early November. Spring planting should be planted with cover. The ideal is to set a small shed in the shed. When the temperature is below -5 ℃, small sheds need to be stamped with straw curtains, or directly in the United States celery plants covered with a layer of shade net, the old film or non-woven antifreeze. American celery resistance is poor. At high temperatures prone to “bad heart”, thereby reducing the quality. Greenhouse planted in spring, to mid-May to be stamped with shade net, high-temperature before the time to market. (C) prevention and control of pests and diseases Spot blight and aphids are the main pests and diseases of the United States celery. In cold