Skip to main content

ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Abiotic Stress
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1441649

Effect of nitrogen reduction combined with biochar application on soda saline soil and soybean growth in black soil areas

Provisionally accepted
Bo Xu Bo Xu 1Hongyu Li Hongyu Li 1Qiuju Wang Qiuju Wang 2Quanfeng Li Quanfeng Li 1Yan Sha Yan Sha 1Chen Ma Chen Ma 1Aizheng Yang Aizheng Yang 1*Mo Li Mo Li 1*
  • 1 Northeast Agricultural University, Harbin, China
  • 2 Heilongjiang Province Black Soil Protection and Utilization Research Institute, Harbin, Heilongjiang, China

The final, formatted version of the article will be published soon.

    To investigate the effect of nitrogen reduction combined with biochar application on a soda saline soil and soybean growth in black soil areas,a pot experiment was set up with two biochar application levels,0(B0) and 4.5t/hm2(B1);two biochar application depths,0-20cm(H1) and 0-40cm(H2);and two nitrogen application levels,conventional nitrogen application(N0) and nitrogen reduction of 15%(N1).The results showed that the application of biochar improved the saline soil status and significantly increased soybean yield under lower nitrogen application.Moreover, increasing the depth of biochar application enhanced the effectiveness of biochar in reducing saline soil barriers to crop growth, which promoted soybean growth. Increasing the depth of biochar application increased the K + and Ca2+ contents,soil nitrogen content,N fertilizer agronomic efficiency, leaf total nitrogen,N use efficiency, AN, Tr, gs, SPAD, leaf water potential, water content and soybean yield and its components. However, the Na+ content,SAR, ESP, Na+/K+ ,Ci and water use efficiency decreased with increasing biochar depth. Among the treatments with low nitrogen input and biochar, B1H1N1 resulted in the greatest soil improvement in the 0-20 cm soil layer compared with B0N0; for example,K+ content increased by 61.87%,Na+ content decreased by 44.80%, SAR decreased by 46.68%, and nitrate nitrogen increased by 26.61%.However, in the 20-40 cm soil layer, B1H2N1 had the greatest effect on improving the soil physicochemical properties,K+ content increased by 62.54%,Na+ content decreased by 29.76%,SAR decreased by 32.85%, and nitrate nitrogen content increased by 30.77%. In addition, compared with B0N0, total leaf nitrogen increased in B1H2N1 by 25.07%, N use efficiency increased by 6.7%,N fertilizer agronomic efficiency increased by 32.79%, partial factor productivity of nitrogen increased by 28.37%, gs increased by 22.10%, leaf water potential increased by 27.33% and water content increased by 6.44%. In conclusion, B1H2N1 had the greatest effect on improving the condition of saline soil; it not only effectively regulated the distribution of salt in soda saline soil and provided a low-salt environment for crop growth but also activated deep soil resources.Therefore, among all treatments investigated in this study, B1H2N1 was considered most suitable for improving the condition of soda saline soil in black soil areas and enhancing the growth of soybean plants.

    Keywords: biochar, nitrogen use efficiency, Soda saline soils, Soybeans, yield, Water use efficiency, Photosynthesis, water relations

    Received: 31 May 2024; Accepted: 30 Aug 2024.

    Copyright: © 2024 Xu, Li, Wang, Li, Sha, Ma, Yang and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Aizheng Yang, Northeast Agricultural University, Harbin, China
    Mo Li, Northeast Agricultural University, Harbin, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.