在绿色无公害生产中,除了对环境方面有严格的要求外,同时还必须把握好化肥施用和农药使用这两个关键性环节。一、化肥施用在绿色无公害生产中,要根据不同的蔬菜种类等具体情况施用不同的氮肥: 1、菠菜、白菜、莴苣等蔬菜容易积累大量的硝酸盐,应绝对禁用硝态氮肥。 2、对于不易积累的硝酸盐的果菜类和根菜类蔬菜,如茄子、青椒、萝卜、胡萝卜等,在生产中也要严格控制用量和施用次数,在采收前30天必须停止使用。 3、根据种植时间的不同谨慎使用硝态氮肥。一般情况下,在高温季节生长的夏菜和秋菜,要尽量减少使用量,而对于冬菜和春菜,要严禁使用。 4、氮肥要早施、深施,以减少硝酸盐的积 In the green pollution-free production, in addition to the strict environmental requirements, but also must grasp the two key aspects of fertilizer and pesticide use. First, the application of chemical fertilizers in the green pollution-free production, according to different types of vegetables and other specific circumstances apply different nitrogen fertilizer: 1, spinach, cabbage, lettuce and other vegetables tend to accumulate large amounts of nitrate, nitrate fertilizer should be absolutely disabled. 2, For the hard-to-accumulate nitrate fruits and vegetables and root vegetables, such as eggplant, green pepper, radish, carrot, etc., must also strictly control the amount of production and the number of applications, must be discontinued 30 days before harvesting. 3, according to the different planting time carefully use nitrate nitrogen fertilizer. Under normal circumstances, summer and autumn vegetables growing in the hot season, to minimize the amount of use, and for the winter vegetables and spring vegetables, to be prohibited. 4, nitrogen should be early Shi, deep facilities to reduce the nitrate product