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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (2): 141-145.doi: 10.11924/j.issn.1000-6850.casb2025-0215

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Effects of Different Amounts of Biochar-based Fertilizer on Soil Properties and Yield and Quality of Celery

LIU Yu(), ZHANG Mengjia, WANG Rui, ZHANG Xuelian, JIN Qiang, YAN Shi, WANG Weirui()   

  1. Beijing Cultivated Land Construction and Protection Center, Beijing 100101
  • Received:2025-03-12 Revised:2025-12-08 Online:2026-01-25 Published:2026-01-22

Abstract:

To explore the effects of different biochar-based fertilizers on soil properties and celery yield in facility settings, a plot experiment was used to compare the single application of organic fertilizer (T1), the single application of biochar (T2, the amount of biochar was 12 t/hm2), and the combined application of biochar and organic fertilizer (T3 to T5, with biochar application rates of 1.5, 3.0 and 6.0 t/hm2) on soil nutrients, celery yield and quality. The results showed that the T4 treatment had the highest celery yield and the lowest nitrate content, which was beneficial to increasing yield and income. In terms of soil nutrients, the application of biochar increased soil organic matter and available potassium to varying degrees, but reduced soil available phosphorus content and EC value, with little effect on total nitrogen content. The increase in organic matter content compared to T1 was 1.41% to 12.54%, and the increase in available potassium content was 4.13% to 9.81%. Regarding soil microbial biomass carbon and nitrogen, the combined application of biochar and organic fertilizer in all treatments (T3 to T5) significantly increased soil microbial biomass nitrogen by 15.60%, 3.24% and 14.40%, respectively; only the T4 treatment increased soil microbial biomass carbon content compared to T1. In conclusion, the combined application of biochar and organic fertilizer can improve soil physical and chemical properties and microbial activity to varying degrees, increase celery yield and quality. In the experiment, the application of 12 t/hm2 of commercial organic fertilizer and 3.0 t/hm2 of biochar had the best overall effect.

Key words: biochar, soil properties, yield, quality, celery