芹菜在生长过程中需追施大量氮肥,但必须注意,芹菜追施氮肥切不可追尿素。因为追施尿素易使芹菜植株老化,纤维增多,还会使芹菜产生苦味。实践证明,芹菜迫施氮肥应以碳酸氢钠或氨水为好,追施后可使植株细嫩,纤维减少,品质提高,且有防治地下害虫的功效。 Celery in the growth process to be topdressing a large number of nitrogen fertilizer, but we must note that celery topdressing nitrogen fertilizer can not be chased urea. Celery plants because of the topdressing easy to make aging, increased fiber, but also make bitter celery. Practice has proved that celery forced nitrogen fertilizer should be sodium bicarbonate or ammonia as well, topdressing allows plants to tender, reduce fiber, improve quality, and control the effectiveness of underground pests.