一、叶菜类这类蔬菜的生长特点是全生育期需要肥水较多。尤其对速效氮肥更为敏感和迫切,如氮肥不足,则叶片黄绿,生长迟缓,产量大减。所以,除施足底肥外,在苗期、中后期如能喷施1%～2%尿素(或硫酸铵)液、7～10天一次,连续2～3次,不但能加速叶片抽生和速生,而且还能节约成本。 First, the growth characteristics of this type of vegetable leafy vegetables need more fertilizer during the whole growth period. Especially for quick-acting nitrogen fertilizer is more sensitive and urgent, such as lack of nitrogen, the leaves of yellow-green, slow growth, yield significantly reduced. Therefore, in addition to foot enough fertilizer, in the seedling, mid-late if spraying 1% to 2% urea (or ammonium sulfate) liquid, 7 to 10 days, 2 to 3 times, not only can accelerate leaf pumping and Fast, but also cost savings.