Abstract: 【Objective】To investigate the optimal NPK fertilizer utilization rates for industrial cannabis（Cannabis sativa L.） on the Tumechuan plain in Inner Mongolia, aiming to increase seed yield.【Methods】The effects of fertilizer treatments on the yield of industrial cannabis were conducted with a randomized block design,with CK（control without any fertilizer）,N₁PK,N₂PK,N₃PK,NP,PK and NK seven treatments. The NPK fertilizer utilization rates were calculated. A univariate quadratic regression linear model was used to fit the amount of nitrogen fertilizer utilized and the yield of industrial cannabis.【Results】The maximum yield of industrial cannabis was 5 676.95 kg/hm² in the N₃PK treatment（nitrogen application rate 337.5 kg/hm²）. Followed by the N₂PK treatment（nitrogen application rate 225.0 kg/hm²） with a yield of 5 533.61 kg/hm². These were 29.51% and 26.24% higher than CK, respectively. The yield responses of nitrogen, phosphorus and potassium fertilizer were 700.35-733.70, 33.35-100.05 and 266.80-300.15 kg/hm² respectively. The agronomic efficiency of nitrogen,phosphorus and potassium fertilizer were 9.34-9.78, 0.44-1.33 and 3.56-4.00 kg/kg respectively. Fertilizers had the following effect on yield：nitrogen fertilizer>potassium fertilizer>phosphorus fertilizer. The univariate quadratic regression linear fitting results showed that the yield was 5 574.38-5 800.76 kg/hm² when the amount of nitrogen fertilizer was 274.84-320.88 kg/hm².【Conclusion】The yield was 5 574.38-5 800.76 kg/hm² when the nitrogen application rate was 274.84-320.88 kg/hm² on industrial cannabis in the Tumechuan plain in Inner Mongolia.

Key words: Industrial cannabis（Cannabis sativa L.）, NPK fertilizer, Fertilizer utilization effect