关键词: 保水剂, 保水剂, 黄瓜, 水分利用率

Abstract: Hydroponic experiment was carried out to study the effects of high phosphorus on the phosphorus absorption, absorption and use efficiency of tobacco. Compared with normal phosphorus (0.66mmol.L-1 H2PO4-) treatment, high phosphorus (3.30-6.6 mmol•L-1 H2PO4-) significantly decreased the biomass, and increased inorganic phosphorus content of tobacco. Along with the increase of phosphorus concentration (0-6.60mmol.L-1) , the phosphorus concentration ratio of tomato’s upper-position leaves to roots dropped, showing high phosphorus inhibited the transportation of phosphorus from the roots to the tip in tomato plants. The phosphorus use efficiency of high phosphorus treatment decreased significantly by 31.25%-37.5%, compared with normal phosphorus treatment.