一、N素肥料的利弊蔬菜生长的全期均需N素营养,其中叶菜类需求量尤多。N肥供应充足,营养生长良好,茎叶内叶绿素含量较高,叶色较绿,叶子有效的功能较长。加之速效N素化肥使用方便,效果显著,故一些菜农往往大量施用N素肥。殊不知,N肥的过量施用,不仅降低了蔬菜的品质,且更有害人们的健康。因为①N素肥料过多,易使叶菜类生长过旺,易造成倒伏、抗逆性低、病虫害多;对于根茎类和果菜类,除具此之外还易产生徒长,生育期延迟,结果不良,成熟不佳等不良现象。② First, the pros and cons of N-fertilizer The entire period of vegetable growth requires N-vegetarian nutrition, of which the demand for more leafy vegetables. N fertilizer supply, nutrition, good growth, higher chlorophyll content in stems and leaves, green leaves, leaves longer effective function. Coupled with quick-acting N-fertilizer easy to use, the effect is significant, so some farmers often use large amounts of N fertilizer. As everyone knows, N fertilizer over-application, not only reduces the quality of vegetables, and more harmful to people’s health. Because ① N fertilizer too much, easy to make leafy growth over, can easily lead to lodging, low resistance, pests and diseases; for rhizomes and fruit and vegetables, in addition to this also prone to leggy growth period delayed, the results Bad, poor maturity and other undesirable phenomena. ②