为了提高氮肥的利用效率，降低氮肥造成的环境污染，探索氮肥增效剂在陇中旱作丘陵区的适应性，在陇中丘陵区旱作农业条件下，设常规施肥、尿素氮减量20%添加NBPT、尿素氮减量20%添加DMPP、尿素氮减量20%、不施氮肥5个处理，研究增效剂NBPT 和DMPP对陇中半干旱区马铃薯产量及水分利用效率的影响。结果表明，常规施肥马铃薯产量均高于尿素氮减量20%的处理，处理间差异不显著，但与不施氮肥差异显著。其中尿素氮减量20%的处理中，以添加DMPP处理产量最高，为13 000 kg/hm2，较不施氮肥处理增产17.72%；其次是添加NBPT处理，较不施氮肥处理增产13.41%；氮减量20%，且不添加DMPP和NBPT处理排名第3，较不施氮肥处理增产12.59%；另外，尿素氮减量20%添加DMPP处理的氮肥农学效率、氮肥偏生产力、水分利用效率和降水利用效率较相同施氮量处理均有一定幅度的提升。因此，DMPP在陇中旱作马铃薯田使用对其产量和水分利用效率具有一定的提升作用。

In order to increase the utilization efficiency of nitrogen fertilizer and decrease the environmental pollution caused by nitrogen fertilizer, an utilization test using nitrogen fertilizer synergist NBPT and DMPP was carried out under dry farming management in the hilly areas of central Gansu to explore the adaptability of nitrogen fertilizer synergist, where the effects of synergists NBPT and DMPP on potato yields and water use efficiencies were studied using five treatments including conventional fertilization, NBPT addition with 20% reduction in urea nitrogen, DMPP addition with 20% reduction in urea nitrogen, 20% reduction in urea nitrogen, and no fertilization(CK). Results showed, except for treatment of no fertilization(CK), potato yield of conventional fertilization was highest in all treatments, but difference among them was not significant and significant compared with CK. DMPP treatment with 20% reduction in urea nitrogen had the highest yield(13 000 kg/ha), which enhanced by 17.72% than CK, following by NBPT treatment, which increased by 13.41% and 12.59% than CK, respectively. On the other hand, the nitrogen fertilizer efficiency, nitrogen fertilizer partial productivity, water use efficiency, and precipitation use efficiency under the DMPP treatment with 20% reduction in urea nitrogen were significantly improved compared to the same nitrogen application rate treatment. Therefore, DMPP has further promotion potential of yield and water use efficiency improvement for potato cultivated in the dryland of central Gansu.

S532

国家重点研发计划(2021YFD1900704)。