Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (4): 884-892.DOI: 10.16178/j.issn.0528-9017.20240811

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Combined application of nitrogen,phosphorus,and potassium fertilizers on yield and nutrient uptake of sorghum-rape rotation

ZHOU Yifan1(), LI Zhiqi2(), CAI Guoxue2, LI Siguang2, PENG Qing2, ZHAO Jingkun3(), WANG Jie1,4, SHI Xiaojun1,4   

  1. 1.College of Resources and Environment,Southwest University,Chongqing 400716
    2.Agricultural Technology Extension Center of Jiangjin District,Chongqing City,Chongqing 402260
    3.Agricultural Technology Extension Station in Chongqing City,Chongqing 400716
    4.National Monitoring Base for Purple Soil Fertility and Fertilizer Efficiency,Chongqing 400716
  • Received:2024-10-21 Online:2026-04-11 Published:2026-04-17
  • Contact: LI Zhiqi,ZHAO Jingkun

Abstract:

To clarify the fertilizer requirements of sorghum-rape rotation in the southwest region,achieve crop yield increase and efficiency improvement,and scientific fertilization,this study conducted field fertilizer efficiency experiments on sorghum-rape rotation for two consecutive years. Five treatments were set up:no fertilization(CK),no nitrogen fertilizer(PK),no phosphorus fertilizer(NK),no potassium fertilizer(NP),and combined application of nitrogen phosphorus and potassium fertilizer(NPK). The crop yield,yield composition,dry matter accumulation,and soil physicochemical properties were measured under different treatments. The nutrient accumulation and utilization rate of fertilizer were calculated under different treatments,and the effects of different fertilization treatments on the yield and nutrient uptake of sorghum-rape rotation were analyzed. The results showed that under different fertilization treatments,the stem biomass and grain yield of sorghum and rape were the highest in the NPK treatment,followed by NP,NK,PK,and CK. The biggest difference in yield composition among different fertilizer treatments for sorghum was the panicle weight. Compared with CK,the panicle weight of sorghum in the other treatments was significantly (p<0.05) higher by 55.57% to 378.72%. For rape,the biggest difference in yield components among different fertilizer treatments was the number of effective siliques per plant. Compared with CK,the number of effective siliques per plant of rape in the treatments of NK,PK,NPK was significantly higher by 524.22% to 632.81%. Compared with other treatments,NPK treatment significantly increased the aboveground nitrogen,phosphorus,and potassium accumulation in sorghum and rape,with nitrogen accumulation showing the most significant improvement. Furthermore,NPK treatment had the highest annual fertilizer partial productivity,apparent utilization efficiency,and agronomic efficiency for both sorghum and rape. Compared with CK,the soil pH value significantly decreased and the organic matter content significantly increased under NPK treatment. In conclusion,combined application of nitrogen phosphorus and potassium fertilizer can increase the yield and yield composition,nutrient uptake,utilization rate of fertilizer,and soil organic matter content of sorghum and rape. It can also maintain the availability of soil nutrients at a higher level. The results of this study can provide scientific basis for understanding the nutrient requirements and rational fertilization in the sorghum-rape rotation in the southwest region.

Key words: sorghum-rape rotation, yield, nutrient uptake, utilization rate of fertilizer, soil nutrient

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