不同磷、钾肥对保水剂吸水、保肥性能的影响  

Effects of phosphate and potassium fertilizers on water absorbent and nutrients holding ability of water retaining agent

作　　者：苟春林[1] 杜建军[2] 曲东[3] 

机构地区：[1]宁夏农林科学院农产品质量监测中心,宁夏银川750002 [2]仲恺农业技术学院植物营养与新型肥料研究室,广东广州510225 [3]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《中国土壤与肥料》2008年第3期52-56,共5页Soil and Fertilizer Sciences in China

基　　金：国家自然科学基金(20376087);广东省科技计划项目(2003C20510);广东省教育厅自然科学研究项目(Z03053)

摘　　要：通过对保水剂在磷肥、钾肥溶液中的吸水倍率和对肥料养分吸持量的测定,研究了不同磷、钾肥对保水剂吸水、保肥性能的影响。结果表明,保水剂在各种肥料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;磷、钾肥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;不同磷、钾肥对保水剂吸水倍率的影响按磷酸一铵、氯化钾、硫酸钾、过磷酸钙顺序递增。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;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,吸持率按过磷酸钙、硫酸钾、氯化钾、磷酸一铵次序依次增大。The effects of phosphate and potassium 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 phosphate and potassium fertilizers, such as ammonium phosphate, super phosphate, potassium chloride, and potassium sulfate. The results showed that the water absorbent ability of the WRA decreased obviously along with the increase of concentrations of various fertilizers. Phosphate and potassium fertilizers had stronger influence on polyacrylic salt polymer than polyacrylic salt- polyacry lamide polymer. The effects of phosphate and potassium fertilizers on the water absorbent rate were： ammonium phosphate 〈 potassium chloride 〈 potassium sulfate 〈 super phosphate. When WRAs swelled in water, they absorbed and fixed the molectdes 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 and had the order： super phosphate 〈 amrnonium phosphate, potassium sulfate 〈 potassium chloride at top concentration.

关 键 词：磷肥 钾肥 保水剂 吸水倍率 肥料吸持 

分 类 号：S482.99[农业科学—农药学]