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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Crop and Product Physiology
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1515584
This article is part of the Research Topic Enhancing Agricultural Water Management: Techniques for Improving Crop Water Efficiency and Sustainability View all 8 articles

Reduce the application of phosphorus fertilizer in peanut fields and improve its efficiency by using iron modified biochar to adsorb phosphorus recovery products

Provisionally accepted
Junxiao Zhang Junxiao Zhang 1Xiangxi Bu Xiangxi Bu 2*Zhenyu Huang Zhenyu Huang 3Changxue Wu Changxue Wu 1*Xiangwen Xie Xiangwen Xie 1*
  • 1 Xinjiang Academy of Agricultural Sciences, Urumqi, China
  • 2 Huai 'an Water Conservancy Survey Design Institute Co., LTD, shenynag, China
  • 3 Jiangxi Provincial Institute of Water Sciences, Nanchang, Jiangxi Province, China

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

    Abstract：To address the scarcity of agricultural phosphorus (P) fertilizers and reduce phosphorus accumulation in wastewater, this study employed iron-modified biochar (Fe-B) to adsorb phosphorus from water. The phosphorus-loaded iron-modified biochar (Fe-BP) was subsequently applied to peanut fields. Batch experiments were conducted to determine the optimal adsorption parameters and mechanism of Fe-B for phosphate ions (PO4 3-). The field experiment utilized a randomized complete block design, comprising the following treatments: no biochar and no P fertilizer (B0P0), no biochar with conventional phosphate fertilizer (B0P1, CK, P2O5 at 144 kg ha -1 ), biochar with CK (B1P1), Fe-B with CK (FeB-P1), phosphorus-loaded Fe-B with CK (FeBP-P1), and phosphorus-loaded Fe-B with two-thirds CK (FeBP-P2, P2O5 at 96 kg ha -1 ). The results demonstrated that the biochar dosage of 0.05 g (2 g L -1 ) results in a phosphate removal rate exceeding 80%. Optimal adsorption efficiency occurs within a pH range of 6-9, with a sharp decline observed at pH values above 10. The presence of NO3 -, Cl-, and SO4 2-does not significantly affect the phosphate adsorption capacity of Fe-B, unlike HCO3 -and CO3 2-, which reduce it. After the fifth desorption and recycling process, the adsorption capacity of the biochar decreased to 24%. The peanut yield in the FeB-P1 treatment was 50.8% higher than that in the FeBP-P2 treatment. While the phosphorus recovery efficiency (REP) does not significantly differ between FeBP-P2 and B1P1 treatments, both are superior to B0P1. Moreover, FeBP-P2 facilitated the available phosphorus concentration in the root zone. Overall, phosphorus-loaded iron-modified biochar reduced the required amount of phosphorus fertilizer, maintain peanut yield, and enhanced phosphorus fertilizer utilization efficiency.

    Keywords: iron-modified biochar, Phosphorus fertilizer utilization efficiency, Absorption, desorption, yield

    Received: 23 Oct 2024; Accepted: 26 Nov 2024.

    Copyright: © 2024 Zhang, Bu, Huang, Wu and Xie. 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:
    Xiangxi Bu, Huai 'an Water Conservancy Survey Design Institute Co., LTD, shenynag, China
    Changxue Wu, Xinjiang Academy of Agricultural Sciences, Urumqi, China
    Xiangwen Xie, Xinjiang Academy of Agricultural Sciences, Urumqi, 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.