磷、钾盐肥对保水剂吸水、保肥性能的影响

通过对保水剂在不同磷、钾肥料溶液中吸水倍率和对肥料养分吸持量的测定,研究了不同磷、钾盐肥对保水剂吸水、保肥性能的影响。结果表明,所用磷、钾肥磷酸一铵、过磷酸钙、氯化钾、硫酸钾均能显著降低保水剂的吸水倍率,并随肥料浓度的增加,保水剂吸水倍率显著降低,它们之间的关系可用幂函数来表征。4种肥料对保水剂吸水倍率的影响按氯化钾<硫酸钾<磷酸一铵<过磷酸钙顺序递增,它们对聚丙烯酸钠盐型保水剂的影响大于聚丙烯酰胺-丙烯酸盐型保水剂。保水剂在吸水溶胀的同时,也吸持溶解在水中的肥料离子,吸持量的大小因保水剂和肥料种类而不同。肥料浓度达到一定值后,随着保水剂吸水倍率的降低,吸持量也随之降低。

Effects of Phosphate and Potassium Fertilizers on Water Absorbent and Nutrients Holding Ability of Water Retaining Agent

The interactions between different P,K fertilizers and Water Retaining Agents(WRAs) with different water absorbent rate(WAR) were studied by determining the WAR and the amount of fertilizers absorbed and fixed by WRAs.The results showed that all the four phosphate fertilizer and potassium fertilizers: monoammonium phosphate,super phosphate,potassium chloride and potassium sulfate,obviously decreased the WARs of the WRAs,and the WARs of the WRAs were markedly decreased with an increase in fertilizer concentration.The relationship was described by power function.The order of the effects of the fertilizers on WAR were potassium chloride < potassium sulfate < monoammonium phosphate < super phosphate,and the four fertilizers had stronger influence on polyacrylic salt polymer than polyacrylic salt-polyacry lamide polymer.The WRAs,when swelled in water,absorbed and fixed the fertilizers dissolved in water.The amount of absorbed and fixed fertilizers differed with WRAs and fertilizer types and decreased at some fertilizer concentrations with a decrease in the WARs.