Journal of environmental quality最新文献_第3页

Optimizing pXRF sample preparation for in situ soil screening: A regulatory framework perspective. 优化原位土壤筛选的pXRF样品制备：监管框架的观点。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-05-07 DOI: 10.1002/jeq2.70038

Hayley Clos, Marisa Chrysochoou

{"title":"Optimizing pXRF sample preparation for in situ soil screening: A regulatory framework perspective.","authors":"Hayley Clos, Marisa Chrysochoou","doi":"10.1002/jeq2.70038","DOIUrl":"https://doi.org/10.1002/jeq2.70038","url":null,"abstract":"This study evaluates the impact of sample preparation methods on the accuracy and precision of portable X-ray fluorescence (pXRF) measurements for trace metals in urban soils in Hartford, CT, in the context of residential regulatory thresholds. Overall, the slopes of dry versus wet and pelletized versus dry sample comparisons ranged from 1.19 to 1.40 and 0.74 to 1.08, respectively, indicating that drying soil samples generally results in higher measured concentrations due to the removal of moisture dilution, while pelletization can slightly reduce measured concentrations through sample homogenization and increased material density. These slope values reveal the consistent influence of preparation on measured concentrations and the potential need for correction factors. Wet in situ analysis, while practical for field application, can underestimate metal concentrations in areas with moist soil conditions, as presented in the current case study, missing regulatory exceedances for lead (Pb) in up to 8% of cases at the 100 mg kg-1 threshold and 7% at the 200 mg kg-1 threshold compared to pelletized samples. Dry in situ measurements reduced missed exceedances to just 1.7% for both thresholds, striking a balance between practicality and accuracy. Pelletization minimized variability and increased precision but offered limited added value for screening purposes. These results underscore the need to adapt pXRF preparation methods to regulatory and contextual requirements, demonstrating its potential as a cost-effective and scalable tool for urban soil contamination assessment.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144013488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bacterial inoculation along with different amendments accelerates the remediation of bauxite residue for vegetation establishment. 细菌接种配合不同改良剂加速了铝土矿渣的修复，有利于植被的建立。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-05-07 DOI: 10.1002/jeq2.70041

Mondem Sudhakara Reddy, Pankaj Krishna

{"title":"Bacterial inoculation along with different amendments accelerates the remediation of bauxite residue for vegetation establishment.","authors":"Mondem Sudhakara Reddy, Pankaj Krishna","doi":"10.1002/jeq2.70041","DOIUrl":"https://doi.org/10.1002/jeq2.70041","url":null,"abstract":"Bauxite residue (red mud) is a by-product generated in huge quantities from the alumina industries with serious environmental issues due to its strong alkalinity, sodicity, and salinity. An attempt has been made to establish vegetation by using bacteria isolated from the bauxite residue along with various amendments. A field study was conducted by inoculating the bacterial consortia (∼350 log cfu/plot) consisting of 10 different bacteria to the bauxite residue mixed with 10% (w/w) of fly ash, sewage sludge, garden soil, and 2% of gypsum. After 6 months of the field experiment, the grass was harvested and determined the growth and mineral uptake. Inoculation of bacterial consortia significantly increased the vegetation in the bauxite residue amended with different ameliorants, and twofold increase in biomass was observed in sewage sludge- and fly ash-amended bauxite residue with bacterial inoculation. Addition of gypsum with bacterial inoculation significantly reduced pH of the bauxite residue from 11.0 to 7.9. Organic carbon, available P, and nitrogen levels were significantly increased in sewage sludge-amended bauxite residue inoculated with bacteria followed by fly ash amendment. Alkaline and acid phosphatases, urease, and invertase enzyme activities also increased due to inoculation of bacterial consortia with all amendments. Uptake of elements such as Mg, K, and Ca increased, while Al, Fe, and Na decreased in the Bermuda grass due to bacterial inoculation. This study demonstrated that inoculation of bacteria along with sewage sludge or fly ash as amendments is a sustainable technology for establishment of green vegetation on bauxite residue.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144013893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of nitrous oxide soil fluxes using sorbent-stabilized sampling of flux chambers. 利用吸附剂稳定通量室取样测量氧化亚氮土壤通量。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-05-05 DOI: 10.1002/jeq2.70036

Julio A Zimbron, Stephen J Del Grosso, Jorge A Delgado

{"title":"Measurement of nitrous oxide soil fluxes using sorbent-stabilized sampling of flux chambers.","authors":"Julio A Zimbron, Stephen J Del Grosso, Jorge A Delgado","doi":"10.1002/jeq2.70036","DOIUrl":"https://doi.org/10.1002/jeq2.70036","url":null,"abstract":"A new chamber-based method to measure nitrous oxide soil gas fluxes using an N2O sorbent is presented. The Greenhouse Gas Reduction through Agricultural Carbon Enhancement network (GRACEnet) protocols require grab samples (typically 25 mL ea.) obtained at multiple intervals throughout chamber deployment (i.e., 0, 15, and 30 min) and linear and nonlinear options to process the raw concentrations, based on goodness-of-fit tests. The new method uses a single, sorbent-stabilized large volume (400 mL) gas sample collected at the end of each chamber deployment (30 min) and assumes a linear concentration increase. Both methods estimate the initial (time 0) gas flux using chamber concentration changes and deployment time. This report presents a side-by-side field test in experimental plots. Samples were independently analyzed by gas chromatography and thermal desorption/gas chromatography for the standard and new method, respectively. Gas concentrations measured by both methods at the end of the chamber deployment and calculated soil gas fluxes were in close agreement (R2 = 0.92 and R2 = 0.91, respectively). Additionally, four 100 mL samples taken from multiple chambers at the end of the deployment were pooled into a single cartridge to explore the sorbent's potential to further reduce the number of samples. Pooled sample results from four locations correlated well with average chamber deployments (R2 = 0.92 and R2 = 0.95 for concentrations and soil gas fluxes, respectively). These results suggest sorbent-based sampling can yield soil gas flux data of similar magnitude to interval grab sampling methods. Further testing is required to study the advantages and limitations of the new method.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144039422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation and use of the dead-end ultrafiltration method for the capture and recovery of Shiga toxin-producing Escherichia coli from surface water. 死端超滤法在地表水中捕获和回收产志贺毒素大肠杆菌的验证和应用。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-30 DOI: 10.1002/jeq2.70035

Ai Kataoka, Jennifer L Wolny, Jose Roberto Guzman, Andrew Battin, Shizhen S Wang, Rebecca Zaayenga, Phillip Kuri, Julie A Kase

{"title":"Validation and use of the dead-end ultrafiltration method for the capture and recovery of Shiga toxin-producing Escherichia coli from surface water.","authors":"Ai Kataoka, Jennifer L Wolny, Jose Roberto Guzman, Andrew Battin, Shizhen S Wang, Rebecca Zaayenga, Phillip Kuri, Julie A Kase","doi":"10.1002/jeq2.70035","DOIUrl":"https://doi.org/10.1002/jeq2.70035","url":null,"abstract":"Root cause analysis following microbial water contamination events typically relies upon the collection of large sample volumes. Dead-end ultrafiltration (DEUF) is an efficient method for sampling and transporting up to 100 L of water from field environments. A single-lab validation (SLV) using DEUF to recover Shiga toxin-producing Escherichia coli (STEC) was recently completed using 100 L surface water samples ranging in turbidity from 3.7 to 12.8 NTU (nephelometric turbidity unit). The SLV trials using E. coli O157:H7 and O121:H19 indicated that a positive recovery rate (25%-85%) from eluates was achievable after inoculating ultrafilters with low-level contamination concentrations of ≤6 CFU/filter (where CFU is colony forming unit). Higher inoculum levels, >27 CFU/filter, resulted in positive detection of STEC in all eluates. To assess interchangeability of ultrafilter brands, three different products with similar fiber and pore size construction were evaluated. Equivalency was demonstrated amongst the brands tested, with no discernible difference noted in STEC detection and recovery. Since processing delays can occur, stability of E. coli O157:H7 in ultrafilters and ultrafilter backflush eluates (UBEs) was examined. Processing of ultrafilters held at 4°C for up to 6 days did not have substantial effects on detection and recovery of E. coli O157:H7. Stored UBE yielded an overall reduction of 0.72 log10 MPN mL-1 (where MPN is most probable number) from Day 0 to Day 6 and an average estimated reduction of 0.07 log10 MPN mL-1 (95% CI: 0.019-0.125) per day. The effect of days of UBE storage was statistically significant, supporting a recommendation to store UBE for the least number of days possible.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143974196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectroscopic investigation of the speciation of phosphorus forms entering and leaving Everglades Stormwater Treatment Areas. 进入和离开沼泽地雨水处理区的磷形态的光谱调查。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-30 DOI: 10.1002/jeq2.70037

Caroline Buchanan Fisher, Lilit Vardanyan, Jonathan D Judy

{"title":"Spectroscopic investigation of the speciation of phosphorus forms entering and leaving Everglades Stormwater Treatment Areas.","authors":"Caroline Buchanan Fisher, Lilit Vardanyan, Jonathan D Judy","doi":"10.1002/jeq2.70037","DOIUrl":"https://doi.org/10.1002/jeq2.70037","url":null,"abstract":"Five large-scale treatment wetlands, the Everglades Stormwater Treatment Areas (STAs), have been constructed in south Florida to reduce phosphorus (P) transport into the Florida Everglades. While the STAs have successfully reduced P entering downstream waterbodies by at least 77%, concentrations in outflow waters still exceed target values in many cases. It has been well documented that P compounds have varying effects on biotic and abiotic processes due to differing stability, bioavailability, and transport characteristics, making it critical to understand the nature of different P pools for improving long-term treatment wetland performance. Here, we used 31P nuclear magnetic resonance (31P NMR) spectroscopy and P X-ray absorption near edge spectroscopy (XANES) to characterize P in surface water particulates entering and leaving the STAs. The most abundant P component at the inflows, as determined via 31P NMR, was orthophosphate (∼36% of P). XANES analyses of inflow waters indicated a lack of iron (Fe)-P bonds and suggested the presence of organic P. Though not commonly documented in this magnitude, polyphosphates were detected in all samples, ranging up to 39% at the outflows. Very little orthophosphate was detected at the outflows, while XANES analysis indicated the presence of hydroxyapatite in STA-2, suggesting internal transformation processes within the wetland. These findings suggest that outflow particulate P may be largely biogenic and that inorganic P may be apatitic in nature, as seen in STA-2. While STA research is relevant for Everglades ecosystem health, the approaches addressed here are informative for treatment wetland research and stormwater P management globally.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144012708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pre-treatment with extraction solvent yields higher recovery: Method optimization for efficient determination of polycyclic aromatic hydrocarbons in organic-rich fine-textured wastes. 萃取溶剂预处理回收率高：富有机细构废弃物中多环芳烃的高效测定方法优化。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-28 DOI: 10.1002/jeq2.70033

Henian Guo, Najmeh Samadi, Maryam Firoozbakht, Alsu Kuznetsova, Tariq Siddique

{"title":"Pre-treatment with extraction solvent yields higher recovery: Method optimization for efficient determination of polycyclic aromatic hydrocarbons in organic-rich fine-textured wastes.","authors":"Henian Guo, Najmeh Samadi, Maryam Firoozbakht, Alsu Kuznetsova, Tariq Siddique","doi":"10.1002/jeq2.70033","DOIUrl":"https://doi.org/10.1002/jeq2.70033","url":null,"abstract":"Fluid fine tailings (FFT) contain numerous organic compounds, including polycyclic aromatic hydrocarbons (PAHs). Growing concerns of PAH toxicity warrants monitoring for environmental consequences and natural attenuation. Conventional Soxhlet extraction yields low (∼50%-60%) recovery of PAHs (naphthalene, phenanthrene, pyrene, dibenzofuran, fluorene, and dibenzothiophene) from FFT, which impedes accurate PAH determination. Therefore, an optimized method was developed in this study that included (1) selection of a suitable solvent, (2) enhancement of PAH recovery by pretreatment, (3) determination of optimal extraction time, and (4) optimization of sample cleanup procedure. Results showed that (1) dichloromethane (DCM) recovered significantly higher masses of PAHs from FFT than hexane (HEX), cyclohexane, or their mixtures with DCM; (2) pretreatment of FFT with DCM significantly improved PAHs recovery using either Soxhlet or mechanical shaking methods; (3) a 24-h Soxhlet extraction with pretreatment yielded the highest and the most consistent PAH recoveries; (4) DCM proved to be an efficient eluent for sample cleanup in silica gel column; and (5) consecutive cleanups with additional silica gel column removed excessive impurities without PAH losses. Therefore, this study developed an optimized method for PAH recoveries from FFT, achieving a pooled mean recovery of ∼94%. This method is applicable to other organic-rich fine-textured wastes such as sludge and clay sediments.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating livestock and cropping systems: Interseeding cereal rye into corn for grazing. 整合畜牧业和种植业系统：在玉米中间种黑麦以供放牧。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-25 DOI: 10.1002/jeq2.70026

Kathy J Soder, Paul R Adler, Curtis J Dell, Benjamin C Williamson

{"title":"Integrating livestock and cropping systems: Interseeding cereal rye into corn for grazing.","authors":"Kathy J Soder, Paul R Adler, Curtis J Dell, Benjamin C Williamson","doi":"10.1002/jeq2.70026","DOIUrl":"https://doi.org/10.1002/jeq2.70026","url":null,"abstract":"Interseeding annual forages into growing corn may be an alternative for both cover and grazing in temperate regions of the United States. A 4-year experiment evaluated the effect of interseeding cereal rye (Secale cereale) into corn for grazing after harvest on corn grain, forage biomass yield and quality, soil health, and estimated spatial biomass yields using vegetation indices (VIs) from multispectral imagery collected from an unmanned aircraft system platform. Corn was planted (79,074 plants ha-1) each spring on two 4.8-ha sites in central Pennsylvania. Cereal rye was interseeded (135 kg ha-1) into corn at the V4-V6 stage. Corn was harvested as grain in November, and each site was subdivided and randomly assigned to grazed or non-grazed treatments. Biomass yield and quality, soil samples, and estimates of biomass yield using VIs from multispectral imagery monitoring occurred in fall and spring. Results indicated that cereal rye plus corn stover provided enough forage for an additional 105-130 animal unit days ha-1 with minimal impact on soil health indicators. Vegetative indices varied in the ability to predict biomass yield; all VIs except normalized difference red edge saturated at ∼2 Mg ha-1. Spring growth of cereal rye was much less dependable than fall. Corn grain yields did not decrease (averaging 9.9 tonnes of dry matter ha-1) as a result of grazing or due to continuous corn planting except in 2019 (dry year) when corn grain yields were reduced by 35%-40%. Interseeding cereal rye into corn that is harvested as grain can be a viable method to establish a cover crop to extend the grazing season without impairing cash crop yield.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143974195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Five foundational tools for managing metadata from the USDA Long-Term Agroecosystem Research (LTAR) Network. 管理美国农业部长期农业生态系统研究（LTAR）网络元数据的五个基本工具。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-25 DOI: 10.1002/jeq2.70027

Nicole E Kaplan, Gerardo Armendariz, Shefali Azad, Bryan R Carlson, William A White, Lori J Abendroth, Alisa W Coffin, Vanessa S Gordon, Jude E Maul, William Osterholz, Jonathan Sears

{"title":"Five foundational tools for managing metadata from the USDA Long-Term Agroecosystem Research (LTAR) Network.","authors":"Nicole E Kaplan, Gerardo Armendariz, Shefali Azad, Bryan R Carlson, William A White, Lori J Abendroth, Alisa W Coffin, Vanessa S Gordon, Jude E Maul, William Osterholz, Jonathan Sears","doi":"10.1002/jeq2.70027","DOIUrl":"https://doi.org/10.1002/jeq2.70027","url":null,"abstract":"The United States Department of Agriculture Long-Term Agroecosystem Research (LTAR) Network comprises 19 sites and has collectively produced nearly one petabyte of data. Data include time-series measurements, remotely sensed imagery, and high-throughput environmental data from field and laboratory instrumentation. Currently, network-level analyses leverage multi-decadal data from historical, as well as ongoing, and coordinated data collection from several network sites. Though this multifaceted data facilitates analyses on cross-site, regional, and national levels, its analytical power is constrained by the locally organized and siloed management and storage practices in place. A network information management system is crucial for robust meta-analyses and syntheses exploring the agricultural management impacts on agroecosystems production, structure, and function across the various LTAR sites. Foundational tools described herein provide the framework for an LTAR network information system that will empower users to find, harmonize, map, and share data across all network locations. Standard metadata have been created and implemented for (1) inventorying datasets managed by each site, (2) creating controlled vocabularies for measurements to facilitate cross-site comparisons and analyses, (3) geolocating data collection, site, and experimental boundaries, (4) publishing protocols to describe how data were generated, (5) reporting the quantitative research impact of published literature, and (6) using dashboards to visualize the data collection. These efforts serve as a pivot point around which collective work at cross-site, regional, and national levels can occur. Harmonized data and metadata provide a robust foundation for the development of network information management and synergistic data science solutions.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144022057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Erratum to "A conceptual model for dissolved P mobilization from legacy sources". 对“从遗留资源中溶解P动员的概念模型”的勘误。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-24 DOI: 10.1002/jeq2.70030

引用次数: 0

Effect of P rates in long-term conservation agriculture trials on the vertical distribution of soil acidity and nutrient availability. 长期保护性农业试验施磷量对土壤酸度和养分有效性垂直分布的影响

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2025-04-24 DOI: 10.1002/jeq2.70029

Tales Tiecher, Luke Gatiboni, Dionata Filippi, Deanna Osmond, David Hardy

{"title":"Effect of P rates in long-term conservation agriculture trials on the vertical distribution of soil acidity and nutrient availability.","authors":"Tales Tiecher, Luke Gatiboni, Dionata Filippi, Deanna Osmond, David Hardy","doi":"10.1002/jeq2.70029","DOIUrl":"https://doi.org/10.1002/jeq2.70029","url":null,"abstract":"Few studies are published on the long-term impact of phosphorus (P) rates as triple superphosphate (208 g P kg-1) on the vertical distribution of soil acidity and the availability of macro and micronutrients within conservation systems. This study explores the long-term impacts of increasing P rates on the vertical distribution of soil acidity and Mehlich-3 nutrient availability in long-term trials managed under conservation tillage in North Carolina. In 2022, soil samples were collected from two contrasting long-term trials: one on a sandy, poorly drained Portsmouth soil at Tidewater Research Station (67 years) and another on a well-drained, clay-rich Lloyd soil at Piedmont Research Station (37 years), at depths of 0-5, 5-10, 10-20, and 20-30 cm. In general, the greater crop yield and nutrient removal over the years occurred with higher rates of P, resulting in a decrease in the soil available potassium (K). Historical use of P increased the content of other nutrients that are part of phosphate compounds (i.e., calcium [Ca] and magnesium [Mg]) or are contaminants in these fertilizers (i.e., zinc [Zn] and manganese [Mn]). The distinct trend of sulfur (S) in both locations, where soil available S content increased with P rates at Tidewater and decreased at Piedmont, reflects the complexity of S dynamics in soils with contrasting characteristics. These findings reveal differences between soils and the importance of integrated nutrient management in long-term experiments to avoid bias in the crop response over the years, especially in fields managed under conservation tillage.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144012797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0