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Combined biochar and nitrogen fertilizer reduces soil acidity and promotes nutrient use efficiency by soybean crop

  • Biochar for a Sustainable Environment
  • Published:
Journal of Soils and Sediments Aims and scope Submit manuscript

Abstract

Purpose

Soil acidification is universal in soybean-growing fields. The aim of our research was to evaluate the effects of soil additives (N fertilizers and biochar) on crop performance and soil quality with specific emphasis on ameliorating soil acidity.

Materials and methods

Four nitrogen treatments were applied as follows: no nitrogen (N0), urea (N1), potassium nitrate (N2), and ammonium sulfate (N3), each providing 30 kg N ha−1. Half plot area of the N1, N2, and N3 treatments was also treated with biochar (19.5 t ha−1) to form N-biochar treatments (N1C, N2C, N3C). Both bulk and rhizosphere soils were sampled separately for the following analyses: pH, exchangeable base cations (EBC), exchangeable acidity (EA), total inorganic N (IN), total N (TN), and microbial phospholipid fatty acids (PLFAs). Soybean biomass and nutrient contents were also determined. Correlation analysis was applied to analyze the relationships between soil chemical properties and soybean plant parameters.

Results and discussion

With N-biochar additions (N1C, N2C, N3C), soil chemical properties changed as follows: pH increased by 0.6–1.2 units, EBC, IN, and TN increased by 175–419, 38.5–54.7, and 136–452 mg kg−1, respectively, and PLFAs increased by 23.6–40.9 nmol g−1 compared to the N0 in the rhizosphere. Microbial PLFAs had positive correlations with soil pH; EBC; exchangeable K, Ca, Na, and Mg; TN; IN; NH4 +; and NO3 (r = 0.66–0.84, p < 0.01). There were negative correlations between PLFAs and EA or exchangeable Al (r = −0.64, −0.66, p < 0.01), which indicated that the additives increased microbial biomass by providing a suitable environment with less acid stress and more nutrients. The additives increased soil NH4 + and NO3 by promoting soil organic N mineralization and reducing NH4 + and NO3 leaching. Moreover, the soybean seed biomass and the nutrient contents in seeds increased with N-biochar additions, especially in the N3C treatment.

Conclusions

N-biochar additions were effective in ameliorating soil acidity, which improved the microenvironment for more microbial survival. N-biochars influenced N transformations at the plant–soil interface by increasing organic N mineralization, reducing N leaching, and promoting N uptake by soybeans. The soil additive ammonium and biochar (N3C) were best in promoting soybean growth.

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Acknowledgments

This work was financially supported by the National Basic Research Program of China (2014CB441003), the National Natural Science Foundation of China (41520104001), and the Fundamental Research Funds for the Central Universities.

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Correspondence to Hong Liao or Jianming Xu.

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Yu, L., Lu, X., He, Y. et al. Combined biochar and nitrogen fertilizer reduces soil acidity and promotes nutrient use efficiency by soybean crop. J Soils Sediments 17, 599–610 (2017). https://doi.org/10.1007/s11368-016-1447-9

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