肥水是一种含有硝酸盐肥分的地下水。肥水中的硝酸盐与硝酸铵化肥、老墙土中的硝酸盐是同一种东西。用肥水灌溉农田,既供水,又施肥,经过多年的生产实践证明:肥水具有含氮量高,增产效果显著的特点。如果以每亩浇50方水计算,一般含氮量相当于施用硫酸铵15～50斤, Fertilizer water is a kind of groundwater containing nitrate fertilizer. Fertilizer in the nitrate and ammonium nitrate fertilizer, nitrate in the old wall of soil is the same thing. Irrigated farmland with fertilizers, both water and fertilizers, after years of production practice has proved: Fertilizer has a high nitrogen content, yield significant results. If the water per square meter of water poured 50, the general nitrogen content equivalent to 15 to 50 kg of ammonium sulfate,