{"title":"Impacts of long-term tillage and fertilization on soil carbon stock and aggregate stability in tropical agriculture","authors":"Phongsakon Tantarawongsa, Amnat Chidthaisong, Surachet Aramrak, Kazuyuki Yagi, Sudarut Tripetchkul, Patikorn Sriphirom, Wattanai Onsamrarn, Wanida Nobuntou, Wanlee Amornpon","doi":"10.1002/ael2.70019","DOIUrl":"https://doi.org/10.1002/ael2.70019","url":null,"abstract":"<div>\u0000 \u0000 <section>\u0000 \u0000 \u0000 <p>This study investigates the effects of tillage and fertilization on the changes of soil organic carbon (SOC) stock in a 46-year long-term field experiment in Thailand. The economic cropping system was maize–mung bean rotation. The experiment treatments included plots with tillage, no tillage, chemical fertilizer, organic amendment, and combination of chemical and organic fertilizer. No-tillage significantly increased soil aggregate stability (water-stable aggregates [WSA], mean weight diameter, and geometric mean diameter). However, only rice straw applications enhanced WSA. SOC stocks of the same soil mass ranged from 21.7 to 40.1 Mg C ha<sup>−1</sup>. The highest SOC stock (40.1 Mg C ha<sup>−1</sup>) and sequestration rate (0.40 Mg C ha<sup>−1</sup> year<sup>−1</sup>) were observed in no-tillage plots with cow dung and chemical fertilizer. These findings underscore the significant potential of integrated practices involving no-tillage and organic amendments to improve soil structure and carbon sequestration in tropical agricultural systems.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Core Ideas</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Long-term tillage practice decreased soil aggregate stability.</li>\u0000 \u0000 <li>Crop residue incorporation preserved soil aggregate stability and increased soil organic carbon (SOC) stock.</li>\u0000 \u0000 <li>No-till supplemented with chemical fertilizer and cow dung enhanced SOC stock.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aaron Lee M. Daigh, Samira H. Daroub, Peter M. Kyveryga, Mark E. Sorrells, James A. Ippolito, Endy Kailer, Shannon L. Osborne, Felix B. Fritschi, Wade E. Thomason, Ronald F. Turco, Michael A. Grusak, Carrie A. M. Laboski, Seth C. Murray, Kimberly A. Garland-Campbell, Joann K. Whalen, Kristen S. Veum, Nathan Ehresman, Zoe Brindley, James M. Cudahy
{"title":"The value and broader impacts of agricultural and environmental scientific meetings","authors":"Aaron Lee M. Daigh, Samira H. Daroub, Peter M. Kyveryga, Mark E. Sorrells, James A. Ippolito, Endy Kailer, Shannon L. Osborne, Felix B. Fritschi, Wade E. Thomason, Ronald F. Turco, Michael A. Grusak, Carrie A. M. Laboski, Seth C. Murray, Kimberly A. Garland-Campbell, Joann K. Whalen, Kristen S. Veum, Nathan Ehresman, Zoe Brindley, James M. Cudahy","doi":"10.1002/ael2.70018","DOIUrl":"https://doi.org/10.1002/ael2.70018","url":null,"abstract":"<p>The socioeconomic value of content presented at the ASA-CSSA-SSSA (where ASA-CSSA-SSSA is American Society of Agronomy–Crop Science Society of America–Soil Science Society of America) Annual Meetings from 2014 to 2023 is estimated at $64.2 billion and is presented in this commentary as a thought exercise, highlighting the potential scale of research dissemination in scientific meetings. Scientific meetings are instrumental for propelling the quality and advancement of research via fostering timely feedback, knowledge dissemination, fresh perspectives, stimulation for networking and new collaborations, preparing scientists for public engagement, and addressing contemporary challenges of cultural accessibility and opportunity. Additionally, the broader impacts include near-term benefits to agricultural and environmental scientists that can transform careers and perspectives on the world, especially for students and early career members. The benefits from these impacts on scientists are then anticipated to propagate into broader and longer term positive impacts on humanity worldwide. In this commentary, we offer the above as a provocation to spark peer discussion on evaluating scientific meetings’ contributions, alongside a working list of broader impacts to inspire philosophical and methodological innovations for quantifying their value.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144118220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eric Potash, Yuhei Nakayama, Michael Douglass, Guadalupe Gonzalez, Andrew J. Margenot
{"title":"Think outside the plots: Perimeter measurements and spatial modeling mitigate confounding in a 145-year experiment","authors":"Eric Potash, Yuhei Nakayama, Michael Douglass, Guadalupe Gonzalez, Andrew J. Margenot","doi":"10.1002/ael2.70020","DOIUrl":"https://doi.org/10.1002/ael2.70020","url":null,"abstract":"<p>Long-term experiments (LTEs) offer unique insights into the effects of agricultural practices on soil organic carbon (SOC). However, early LTEs commonly lack treatment randomization, replication, and initial measurements of SOC. This creates a potential problem of unmeasured confounding. We address this problem using the Morrow Plots (established 1876) as a case study. We start with a standard mixed effects model of SOC and add (i) a spatial kriging component and (ii) SOC measurements in the sod perimeter of the experiment as an additional treatment level. We find that much of the observed SOC variation between treatments after 145 years is not due to treatments but other factors (e.g. initial SOC), attenuating treatment effects by about 50%. Our study demonstrates that creative measurement and innovative modeling can mitigate some deficiencies in early LTEs. However, our improved estimates still have limited precision, suggesting the importance of careful design and measurement in the first place.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144085315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Lime equivalence values of 19 biochar products made from defatted cottonseed meal, poultry litter, and woody sources for quality assessment","authors":"Olaniyi Adewumi, Zhongqi He, Renuka Dhandapani, Mingxin Guo","doi":"10.1002/ael2.70017","DOIUrl":"https://doi.org/10.1002/ael2.70017","url":null,"abstract":"<div>\u0000 \u0000 <section>\u0000 \u0000 \u0000 <p>The lime equivalence, expressed in calcium carbonate equivalent (CCE), is an important quality parameter of biochar as a soil amendment. This work measured the CCE values and the relevant physicochemical parameters of seven defatted cottonseed meal-, seven poultry litter-, and five wood-based biochar products. The CCE of the 19 biochar samples covered a wide range of values from 2.75 to 128.0 g CaCO<sub>3</sub> kg<sup>−1</sup>. Furthermore, the lime equivalence showed a significant (<i>p</i> < 0.05) correlation with the pH parameter, but not (<i>p</i> > 0.05) with the organic content, ash content, electrical conductivity, and sum of soluble base cations. As biochar products with greater lime equivalence have the advantages to substantially reduce soil acidity and improve soil fertility, information derived from this work would shed light on biochar product optimization and appraisals for preferably rectifying strongly acidic soils via efficiently neutralizing soil acids, raising soil pH, and enhancing soil health and productivity.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Core Ideas</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Lime equivalence values and relevant parameters of 19 agricultural and forest byproduct biochar samples were measured.</li>\u0000 \u0000 <li>The measured lime equivalence of biochar covered a wide range from 2.8 to 128.0 g CaCO<sub>3</sub> per kg of mass.</li>\u0000 \u0000 <li>The lime equivalence of biochar samples shows meaningful (<i>p</i> < 0.05) correlation with pH parameter.</li>\u0000 \u0000 <li>Total soluble base cations show significant (<i>p</i> < 0.05) correlations with the electrical conductivity and ash content.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Megan Bourns, Greg Buol, John T. Spargo, Luke Gatiboni, Matt A. Yost, Nathan A. Slaton, Deanna L. Osmond
{"title":"The Fertilizer Recommendation Support Tool: A relational database and decision interface tool","authors":"Megan Bourns, Greg Buol, John T. Spargo, Luke Gatiboni, Matt A. Yost, Nathan A. Slaton, Deanna L. Osmond","doi":"10.1002/ael2.70016","DOIUrl":"https://doi.org/10.1002/ael2.70016","url":null,"abstract":"<p>The Fertilizer Recommendation Support Tool (FRST) Project is a collaborative effort involving most land grant institutions, USDA branches, nonprofit organizations, and private industry. The FRST objectives are to develop a soil fertility community of practice, preserve soil test correlation and calibration data in a relational database, and develop a decision tool to provide consistent soil test interpretations. Released in April 2024, the interactive tool acts on an evolving database that contained 1455 P trials, 1316 K trials, and 143 S trials from 44 states and Puerto Rico by March 1, 2025. Decision tool outputs include an interactive county-level map of available data and an estimated critical soil test value. The FRST relational database is a repository for soil-test-based P, K, and S data to support data-driven management recommendations. Continued success of the FRST project and decision tool utility rely on collaboration and support from the soil-test-based nutrient management community.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Phosphorus application rates and farmers’ perceptions of environmental concerns","authors":"Sampriti Sarkar, Frank Lupi, Bruno Basso","doi":"10.1002/ael2.70014","DOIUrl":"https://doi.org/10.1002/ael2.70014","url":null,"abstract":"<div>\u0000 \u0000 <section>\u0000 \u0000 \u0000 <p>Fertilizer overapplication remains a persistent challenge in several US watersheds. Farmer attitudes play a key role in nutrient management decisions, but few studies link farmer attitudes to phosphorus(P) fertilizer application rates. This study analyzes survey responses from 1650 Michigan corn farmers to assess P application behaviors and attitudes. The objective is to identify factors influencing P management and evaluate differences between P-overapplying and non-overapplying farmers. Overapplication is based on self-reported P use and soil P levels, and differences are tested using chi-square tests. Results show significant differences in attitudes, perceptions, and management practices between the two groups. Overapplying farmers express greater concern about nutrient runoff, suggesting they may be receptive to interventions. This study emphasizes the need to address P overapplication and improve information dissemination through agricultural consultants, soil testing laboratories, and extension services, as 55% of farmers reported not receiving recent information on P yield response.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Core Ideas</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Farmer attitudes and perceptions are critical factors influencing management practice adoption.</li>\u0000 \u0000 <li>Self-reported survey data for 1650 corn farmers in Michigan reveal phosphorus (P) fertilizer overapplication.</li>\u0000 \u0000 <li>Farmers that overapply P fertilizer have different attitudes than other farmers.</li>\u0000 \u0000 <li>Farmers overapplying P fertilizer indicate higher environmental concerns.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143762093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adam Leise, Mandeep Singh, Nicolas Cafaro La Menza, Stevan Z. Knezevic, Amit J. Jhala
{"title":"A dual tank precision sprayer to evaluate the interaction of 2,4-D choline and quizalofop-p-ethyl for control of volunteer corn in corn","authors":"Adam Leise, Mandeep Singh, Nicolas Cafaro La Menza, Stevan Z. Knezevic, Amit J. Jhala","doi":"10.1002/ael2.70015","DOIUrl":"https://doi.org/10.1002/ael2.70015","url":null,"abstract":"<p>Quizalofop-p-ethyl (QPE) can control glufosinate/glyphosate-resistant corn (<i>Zea mays</i> L.) volunteers in corn resistant to aryloxyphenoxypropionates (Enlist corn). Mixing QPE with broadleaf herbicides such as 2,4-D choline can be antagonistic. A new precision sprayer with a dual tank/boom system can apply two herbicides simultaneously through separate nozzles, potentially reducing chemical antagonism. The objective of this study was to evaluate the interaction of QPE + 2,4-D choline applied via single tank or dual tank/boom system for controlling glufosinate/glyphosate-resistant corn volunteers in Enlist corn. Bin-run glufosinate/glyphosate-resistant corn was planted at 54,000 seeds ha<sup>−1</sup> to mimic corn volunteers. At 14 days after application (DAA), the dual tank/boom application of QPE (39 g a.i. ha<sup>−1</sup>) and 2,4-D choline (1064 g a.e. ha<sup>−1</sup>) achieved 85% volunteer corn control, compared to 70% control with single tank mix. The single tank application of QPE + 2,4-D choline was 7%–26% antagonistic until 28 DAA. Conversely, dual tank application of QPE and 2,4-D choline was additive. Although dual tank application of QPE and 2,4-D choline did not have transient antagonism (14 DAA), it was otherwise eliminated by 28 DAA using the higher rate of QPE (77 g a.i. ha<sup>−1</sup>) in the tank mix. By 28 DAA, volunteer corn control was ≥92% across all treatments, with similar corn yield and no crop injury. The results suggest that a dual tank/boom system provided better volunteer corn control at 14 DAA; however, control was similar when using a higher rate of QPE (77 g a.i. ha<sup>−1</sup>) with 2,4-D choline in tank mix at 28 DAA.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Helen C. S. Amorim, Amanda J. Ashworth, Gerson L. Drescher, Mohkam Singh, Marcio R. Nunes
{"title":"Transferability of soil management assessment framework indices to detect best soil management strategies in tropical agroecosystems","authors":"Helen C. S. Amorim, Amanda J. Ashworth, Gerson L. Drescher, Mohkam Singh, Marcio R. Nunes","doi":"10.1002/ael2.70013","DOIUrl":"https://doi.org/10.1002/ael2.70013","url":null,"abstract":"<p>Soil management assessment framework (SMAF) algorithms have not been validated for tropical soils, which can prevent proper SMAF-based soil health monitoring. This study tested SMAF's ability to detect soil health as affected by soil management practices in the Mid-South United States and Brazil for improving SMAF performance in tropical regions. Eleven SMAF studies published in Brazil (<i>n</i> = 166) and 56 from the Mid-South United States (<i>n</i> = 500) were compiled. Management groups were perennial (PER), no-till (NT), reduced tillage (RT), and conventional tillage (CT) systems. In the United States, SMAF soil quality index decreased as follows: PER ≥ RT ≥ NT = CT, while for Brazil, PER > NT = RT = CT. Macroaggregate and microbial biomass carbon scores under CT were overestimated, resulting in nonsignificant differences between conservation and conventional soil management. Revision of organic matter and textural parameters is needed to improve SMAF utilization in tropical agroecosystems.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeong-In Hwang, Jason K. Norsworthy, Nanda Kumar, Tae-Hwa Kim
{"title":"Environmental release of a safener fenclorim from rice (Oryza sativa L.) following seed treatment","authors":"Jeong-In Hwang, Jason K. Norsworthy, Nanda Kumar, Tae-Hwa Kim","doi":"10.1002/ael2.70011","DOIUrl":"https://doi.org/10.1002/ael2.70011","url":null,"abstract":"<div>\u0000 \u0000 <section>\u0000 \u0000 \u0000 <p>The safener fenclorim, effective in protecting rice (<i>Oryza sativa</i> L.) from the phytotoxicity of some herbicides, is regarded as a contaminant of emerging concern that may cause toxicological issues to ecosystems and humans who may consume the final harvested rice. This study investigated time-dependent environmental releases of fenclorim from rice seeds treated with the safener and insecticide with five different treatments. The treatment with fenclorim alone caused the greatest fenclorim releases from the seed, and the release magnitude was similar to the treatment that had fenclorim and insecticide in mixture. The fenclorim release was the least when treated with safener and insecticide in sequence. Based on the previous literatures, all fenclorim release magnitudes observed in this study were at toxicologically safe levels for various living organisms in the soil, and fenclorim residues determined in the final rice harvest were also safe levels below the instrumentally detectable level.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Core Ideas</h3>\u0000 \u0000 <div>\u0000 <ul>\u0000 \u0000 <li>Seed treatment with safener alone causes the largest fenclorim release to environments.</li>\u0000 \u0000 <li>Seed treatment with safener and insecticide in sequence minimizes fenclorim releases.</li>\u0000 \u0000 <li>Fenclorim residues in the final rice harvest were below the detectable level.</li>\u0000 \u0000 <li>The fenclorim used will not cause residual issues in the ecosystem and harvested rice.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Phosphate elution from anion-exchange membranes in soil analysis","authors":"Suwei Xu, Andrew J. Margenot","doi":"10.1002/ael2.70012","DOIUrl":"https://doi.org/10.1002/ael2.70012","url":null,"abstract":"<p>Resin-extractable phosphate (PO<sub>4</sub>-P) is a widespread sink-based measure of soil bioavailable phosphorus (P) used in biogeochemistry and soil fertility. However, acid elution of P may hydrolyze organic P and thus compromise measurement of PO<sub>4</sub>-P. We evaluated sodium bicarbonate (NaHCO<sub>3</sub>) as an alternative to sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) for PO<sub>4</sub>-P elution. We found 0.5 M NaHCO<sub>3</sub> achieved ≈100% PO<sub>4</sub>-P recovery at higher initial PO<sub>4</sub>-P concentrations (20 and 30 mg P/L), compared to 95%–98% with 0.25 M H<sub>2</sub>SO<sub>4</sub>. For 24 soil samples representing all 12 USDA soil orders, NaHCO<sub>3</sub> elution yielded 9.6% higher resin extractable PO<sub>4</sub>-P than H<sub>2</sub>SO<sub>4</sub>. Additionally, the PO<sub>4</sub>-P remaining in water extract after resin removal (H<sub>2</sub>O<sub>re</sub>-PO<sub>4</sub>) was consistently quantifiable, and constituted up to 46% of total extractable PO<sub>4</sub>-P. These results demonstrate (i) NaHCO<sub>3</sub> is a more effective eluent for resin extractable P than H<sub>2</sub>SO<sub>4</sub>, and (ii) H<sub>2</sub>O<sub>re</sub>-PO<sub>4</sub> should be quantified when measuring resin extractable P.</p>","PeriodicalId":48502,"journal":{"name":"Agricultural & Environmental Letters","volume":"10 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ael2.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}