采用高分子聚合物配施氮、磷、钾肥，研究沙地玉米的水分利用效率和产量。试验分2个主处理(用高分子聚合物胶体处理沙层，以无胶处理为对照)，5个养分副处理(OPT、OPT+1/2N、 OPT-1/2N、OPT-N、CK)。对玉米产量和水分利用效率的进行对比，结果表明:播种前在沙地中施入高分子聚合物，可以有效提高土壤的保水能力，提高玉米产量及水分利用效率。

This experiment adopts new type of polymer on sandy land are first treated. Two main processing experiment(Macromolecule Polymers， CK)， Five sub-processing(OPT、 OPT+1/2N、 OPT-1/2N、 OPT-N、 CK). Corn as test material， the comparative study of crop yield and water use efficiency. The result shows that before sowing in the sand applied in macromolecule polymers， can effectively improve the soil water holding capacity， improve the growth habit of crop， increase crop yield and water use efficiency. The improvement and utilization in the sand， in the macromolecule polymers is applied at the same time， but also pay attention to the combined application of fertilizer.

S513

甘肃省旱作区水资源高效利用重点实验室基金“新型保水材料在大田土壤中保水保肥的机制研究”(2012GAAS15-22-2)