以冀张薯12号为指示品种，测定凹凸棒保水剂不同施用量对旱作马铃薯土壤理化性质(有机质、碱解氮、速效磷、速效钾)在不同生长期的变化。结果表明，凹凸棒保水剂施用量为67.5 kg/hm2时，可有效减少有机质、速效磷、速效钾的流失；施用量为45.0 kg/hm2时，可有效减少碱解氮流失。

Jizhangshu 12 was used as the experimental material， the changes of soil physical and chemical properties(organic matter， alkali-hydrolyzed nitrogen， available phosphorus and available potassium) were determined by different application rates at different growth stages. The experimental results showed that the application of attapulgite water-retaining agent at 67.5 kg/hm2 could effectively reduce the loss of organic matter， available phosphorus and available potassium， and the application at 45.0 kg/hm2 could effectively reduce the loss of soil alkali hydrolyzable nitrogen.

S143.91；S532

甘肃高等学校创新能力提升项目资助(2019B-296)。