中文摘要：

测定保水剂在不同氮肥（尿素、碳酸氢铵、硝酸铵、硫酸铵、氯化铵）溶液中的吸水倍率和对肥料养分的吸持量,分析不同氮肥对保水剂吸水、保肥性能的影响.结果表明：保水剂在各种氮肥溶液中吸水倍率显著下降,并随肥料浓度的增加下降幅度增加;受影响程度聚丙烯酸钠盐型保水剂大于聚丙烯酰胺-丙烯酸盐型保水剂;不同氮肥对保水剂吸水倍率的影响按尿素、碳酸氢铵、硝酸铵、硫酸铵、氯化铵顺序递增.保水剂在大量吸水的同时,也对溶液中的肥料分子或者离子有吸持作用,吸持量均随肥料浓度的增加而增加;保水剂和肥料品种不同,吸持量也不同;除尿素外,保水剂对肥料的吸持率随肥料浓度的增加而降低,最高浓度下,吸持率按硝酸铵、碳酸氢铵、氯化铵、硫酸铵、尿素次序依次增大.

英文摘要：

The effects of nitrogen fertilizers on water absorbent and nutrients holding ability of water retaining agent （WRA） were studied by determining water absorbent rate and amounts of absorbed and fixed fertilizers by WRA in different nitrogen fertilizers, such as urea, ammonium bicarbonate, ammonium nitrate, ammonium sulfate, and ammonium chloride. The results showed that the water absorbent ability of the WRA decreased obviously along with the increase of concentrations of various fertilizers. Nitrogen fertilizers had stronger influence on polyacrylic salt polymer than on polyacrylic salt-polyacry lamide polymer. The effects of nitrogen fertilizers on the water absorbent rate were： urea〈 ammonium bicarbonate〈 ammonium nitrate〈 ammonium sulfate〈 ammonium chloride. When WRAs swelled in water, they absorbed and fixed the molecules or ions of the fertilizers dissolved in water while they absorbed water. The amounts of absorbed and fixed fertilizers increased with the increase of concentrations of fertilizers, but they were dissimilar in different fertilizer solutions. The rate of absorbed and fixed fertilizers, however, decreased along with the increase of concentrations of fertilizers except urea, and showed the order： ammonium nitrate〈 ammonium bicarbonate〈 ammonium chloride〈 ammonium sulfate〈 urea at top concentration.