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随着人民生活水平提高,对食品的需求由数量的满足,转向对品质的要求,选择优良品种故然是第一位,但不合理的施肥,导致品质下降,尤其是蔬菜作物,氮肥对其品质的影响更为突出。目前蔬菜生产上存在着过量施用单一的氮化肥,以求高产。由于超量施氮,往往来不及在蔬菜体内转化成营养养分,而以硝酸盐的形态贮藏于菜体中,对人是有害的。另外,由于大量施用单一的氮化肥,造成土壤肥力下降,土壤板结,菜田地力衰退严重,产量
With the improvement of people’s living standards, the demand for food has been changed from quantity to demand for quality. Selection of fine varieties is the first priority. However, irrational application of fertilizers leads to a decline in quality, especially in vegetable crops and nitrogenous fertilizers The impact of quality is more prominent. At present, there is over-application of nitrogen fertilizer in vegetable production in order to achieve high yield. Due to excessive nitrogen, often too late in the vegetable into nutrients, while the form of nitrate stored in vegetables, is harmful to humans. In addition, due to the large amount of application of a single nitrogen fertilizer, resulting in decreased soil fertility, soil compaction, serious decline in soil fertility, yield