大棚等保护地蔬菜,比露地蔬菜单位面积施肥量大得多,且因无雨水淋失,致使剩余的肥料大部分残留于土壤中,使土壤溶液浓度过高,妨碍根系吸收养成或损伤根系,所以设施栽培蔬菜,应充分考虑前茬肥料的后效,多施有机肥,适当少施化肥,避免因盐类积聚而使作物受害,从而进一步发挥保护地蔬菜的优势。蔬菜对土壤养分的吸收量,很大程度上取决于根系发育。一般根系入土深而广,须根多,根毛发达的蔬菜(如南瓜、冬瓜等),以及根系较大的 Greenhouses and other protected vegetables, the amount of fertilizer per unit area than the open field is much larger, and because there is no rain leaching, leaving most of the remaining fertilizer in the soil, the soil solution concentration is too high, hinder root absorption to develop or damage the root system Therefore, the cultivation of vegetables in facilities should take full account of the effect of the former crop fertilizer, apply more organic fertilizer, apply less fertilizer appropriately, and avoid the crop damage caused by salt accumulation, so as to further exert the advantages of protected vegetable. Vegetable nutrient uptake of the soil, largely depends on the root development. Roots into the general deep and wide roots, fibrous roots, root hair developed vegetables (such as pumpkin, melon, etc.), and the larger root