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Urease activity and nitrogen dynamics in highly weathered soils with designer biochars under corn cultivation

Biochar 2020年第3期2卷 343-356页

作者： gilbert C.sigua Jeff M.Novak Don W.Watts William T.Myers Thomas F.Ducey Kenneth C.Stone United States Department of Agriculture Agricultural Research ServiceCoastal Plains SoilWaterand Plant Research Center2611 West Lucas StreetFlorenceSC 29501USA

The application of designer biochar has the potential to impact soil enzyme activity and soil nitrogen ***,very little is known about the mechanisms responsible for biochar-enzyme-nitrogen interaction in highly weathered *** objective of our 3-year(2016-2018)field experiment was to evaluate the effectiveness of designer biochars(DB)in enhancing urease activity(UA),total nitrogen(TN),total inorganic nitrogen(TIN),and nitrogen uptake(NU)at different growth stages(GS)of corn in a highly weathered soil of southeastern Coastal Plain region,*** treatments have consisted of the control,100%pine chips(100PC),100%poultry litter(100PL),2:1 blend of PC and PL(PCPL),100%raw switchgrass(Panicum vaginatum,L;100RSG),and 2:1 blend of PC and RSG(PCRSG).All the designer biochar treatments were applied at the rate of 30,000 kg ha^(−1)to a Goldsboro loamy sand in *** activity,TN,TIN,and NU varied remarkably with DB(p≤0.0001)at different GS(p≤0.0001)of *** treated with 100PL had the greatest UA(28.18μg N g^(−1)h^(−1)),TN(0.087%),and TIN(14.53 mg kg^(−1))while the least UA,TN,and TIN of 20.55μg N g^(−1)h^(−1),0.063%,and 5.42 mg kg^(−1),respectively,were observed from the *** three-year TN average increase over the control was in the order:100PL(36.8%)>100RSG(25.8%)>PCRSG(25.3%)>PCPL(23.9%)>100PC(7.1%).The greatest NU of corn of 140.4 kg N ha^(−1)was from soils treated with 100PL while the least amount of NU was from ***,our results showed promising significance for the treatment of highly weathered soils since the application of DB did enhance UA and improve TN and TIN in the soils.

关键词： Goldsboro sandy loam Coastal plain Corn Urease activity Highly weathered soil Nitrogen Designer biochars Total inorganic nitrogen

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Phytoremediation:A Green Technology to Remove Environmental Pollutants

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American Journal of Climate Change 2013年第1期2卷 71-86页

作者： Annie Melinda Paz-Alberto gilbert C.sigua Institute for Climate Change and Environmental Management Central Luzon State UniversityScience City of MuñozPhilippines Coastal Plains Soil Water&Plant Research CenterAgricultural Research ServiceUnited States Department of AgricultureFlorenceUSA

Land, surface waters, and ground water worldwide, are increasingly affected by contaminations from industrial, research experiments, military, and agricultural activities either due to ignorance, lack of vision, carelessness, or high cost of waste disposal and treatment. The rapid build-up of toxic pollutants (metals, radionuclide, and organic contaminants in soil, surface water, and ground water) not only affects natural resources, but also causes major strains on ecosystems. Interest in phytoremediation as a method to solve environmental contamination has been growing rapidly in recent years. This green technology that involved “tolerant plants” has been utilized to clean up soil and ground water from heavy metals and other toxic organic compounds. Phytoremediation involves growing plants in a contaminated matrix to remove environmental contaminants by facilitating sequestration and/or degradation (detoxification) of the pollutants. Plants are unique organisms equipped with remarkable metabolic and absorption capabilities, as well as transport systems that can take up nutrients or contaminants selectively from the growth matrix, soil or water. As extensive as these benefits are, the costs of using plants along with other concerns like climatic restrictions that may limit growing of plants and slow speed in comparison with conventional methods (i.e., physical and chemical treatment) for bioremediation must be considered carefully. While the benefits of using phytoremediation to restore balance to a stressed environment seem to far outweigh the cost, the largest barrier to the advancement of phytoremediation could be the public opposition. The long-term implication of green plant technology in removing or sequestering environmental contaminations must be addressed thoroughly. As with all new technology, it is important to proceed with caution.

关键词： Phytoremediation Green Technology Pollutants Contaminants Toxic Metals

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Biochar compost blends facilitate switchgrass growth in mine soils by reducing Cd and Zn bioavailability

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Biochar 2019年第1期1卷 97-114页

作者： Jeffrey M.Novak James A.Ippolito Donald W.Watts gilbert C.sigua Thomas F.Ducey Mark G.Johnson Coastal Plains Soil Water and Plant Research CenterUnited States Department of AgricultureAgricultural Research ServiceFlorenceSC 29501USA Department of Soil and Crop Sciences Colorado State UniversityFort CollinsCO 80523USA National Health and Environmental Effects Research Laboratory United States Environmental Protection AgencyCorvallisOR 97331USA

Biochars have the potential to reclaim mine-impacted soils;however,their variable physico-chemical properties incite specu-lation about their successful remediation *** investigation examined the capability of biochars produced from three different feedstocks along with a compost blend to improve switchgrass growth conditions in a mine-impacted soil by examining influences on soil pH,grass metal contents,and soil-extractable metal ***(Cd)-and zinc(Zn)-contaminated mine soil was collected from a site near Webb City,Missouri,USA-a location within the Tri-State Min-ing *** a full factorial design,soil was treated with a 0%,2.5%,and 5%(w/w)compost mixture(wood chips+beef cattle manure),and 0%,2.5%and 5%of each biochar pyrolyzed from beef cattle manure,poultry litter,and lodgepole pine ***(Panicum virgatum,‘Cave-In-Rock’variety)was grown in a greenhouse for 50 days and the mass of shoots(above-ground biomass)and roots was assessed,while soil pH,deionized H_(2)O-and 0.01 M CaCl_(2)-extractable Cd and Zn concentrations were *** litter biochar and compost had the greatest ability to raise soil pH(from 4.40 to 6.61),beef cattle manure biochar and compost moderately raised pH(from 4.4 to 5.92),and lodgepole pine biochar and compost weakly raised pH(from 4.40 to 5.05).Soils treated with beef cattle manure biochar,poultry litter biochar signifi-cantly reduced deionized H_(2)O-and 0.01 M CaCl_(2)-extractable Cd and Zn concentrations,while lodgepole pine biochar-treated soils showed mixed *** shoot and root masses were greatest in soil treated with compost in combination with either beef cattle manure biochar or poultry litter *** treated with 5%beef cattle manure biochar+5%compost had greater reductions in total Cd and Zn concentrations measured in switchgrass shoots and roots compared to the other two *** three biochars and compost mixtures applied to heavy metal,mine-im

关键词： Biochar Heavy metals Metal sorption Tri-State Mine soil Remediation Switchgrass

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Feedstock choice,pyrolysis temperature and type influence biochar characteristics:a comprehensive meta-data analysis review

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Biochar 2020年第4期2卷 421-438页

作者： James A.Ippolito Liqiang Cui Claudia Kammann Nicole Wrage‑Mönnig Jose MEstavillo Teresa Fuertes‑Mendizabal Maria Luz Cayuela gilbert sigua Jeff Novak Kurt Spokas Nils Borchard Department of Soil and Crop Sciences Colorado State UniversityFort Collins 80523USA School of Environmental Science and Engineering Yancheng Institute of Technology9 Yingbin AvenueYancheng 224051China Department of Applied Ecology Geisenheim UniversityVon‑Lade‑Straße 165366 GeisenheimGermany Faculty of Agricultural and Environmental Sciences Grassland and Fodder SciencesUniversity of RostockJustus‑von‑Liebig‑Weg 618059 RostockGermany Department of Plant Biology and Ecology University of the Basque Country(UPV/EHU)Apdo.64448080 BilbaoSpain Department of Soil and Water Conservation and Waste Management CEBAS-CSICCampus Universitario de Espinardo30100 MurciaSpain United States Department of Agriculture Agriculture Research ServiceCoastal Plains Research Center2611 West Lucas StreetFlorenceSC 29501USA United States Department of Agriculture Agriculture Research ServiceSoil and Water Management Research UnitUniversity of Minnesota439 Borlaug Hall1991 Buford CircleSt.PaulMN 29501USA Natural Resources Institute Finland(Luke) Latokartanonkaari 900790 HelsinkiFinland

Various studies have established that feedstock choice,pyrolysis temperature,and pyrolysis type influence final biochar physicochemical ***,overarching analyses of pre-biochar creation choices and correlations to biochar characteristics are severely ***,the objective of this work was to help researchers,biochar-stakeholders,and practitioners make more well-informed choices in terms of how these three major parameters influence the final biochar *** approximately 5400 peer-reviewed journal articles and over 50,800 individual data points,herein we elucidate the selections that influence final biochar physical and chemical properties,total nutrient content,and perhaps more importantly tools one can use to predict biochar’s nutrient *** on the large dataset collected,it appears that pyrolysis type(fast or slow)plays a minor role in biochar physico-(inorganic)chemical characteristics;few differences were evident between production *** temperature,however,affects biochar’s longevity,with pyrolysis temperatures>500℃ generally leading to longer-term(i.e.,>1000 years)*** pyrolysis temperatures also led to biochars containing greater overall C and specific surface area(SSA),which could promote soil physico-chemical ***,based on the collected data,it appears that feedstock selection has the largest influence on biochar *** surface area is greatest in wood-based biochars,which in combination with pyrolysis temperature could likely promote greater changes in soil physical characteristics over other feedstock-based ***-and other grass-based biochars appear to have cation exchange capacities greater than other biochars,which in combination with pyrolysis temperature could potentially lead to longer-term changes in soil nutrient *** collected data also suggest that one can reasonably predict the availability of various biochar nutrients(e.g.,N,P

关键词： Biochar Total elemental analysis Plant-available elemental analysis Physico-chemical characteristics·Meta-analysis

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Microbial response to designer biochar and compost treatments for mining impacted soils

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Biochar 2021年第3期3卷 299-314页

作者： Thomas F.Ducey Jeffrey M.Novak gilbert C.sigua James A.Ippolito Hannah C.Rushmiller Donald W.Watts Kristin M.Trippe Kurt A.Spokas Kenneth C.Stone Mark G.Johnson Coastal Plains Soil Waterand Plant Research CenterAgricultural Research Service-USDAFlorenceSCUSA Department of Soil and Crop Sciences Colorado State UniversityFort CollinsCOUSA National Forage Seed Production Research Center Agricultural Research Service-USDACorvallisORUSA Soil and Water Management Research Unit Agricultural Research Service-USDASt.PaulMNUSA National Health and Environmental Effects Research Laboratory US Environmental Protection AgencyCorvallisORUSA

The Oronogo-Duenweg mining belt is a designated United States Environmental Protection Agency Superfund site due to lead-contaminated soil and groundwater by former mining and smelting *** that have undergone remediation-in which the O,A,and B horizons have been removed alongside the lead contamination-have an exposed C horizon and are incalcitrant to revegetation *** also continue to contain quantifiable Cd and Zn *** improve soil conditions and encourage successful site revegetation,our study employed three biochars,sourced from different feedstocks(poultry litter,beef cattle manure,and lodgepole pine),at two rates of application(2.5%,and 5%),coupled with compost(0%,2.5%and 5%application rates).Two plant species-switchgrass(Panicum virgatum)and buffalograss(Bouteloua dactyloides)-were grown in the amended *** of soils with poultry litter biochar applied at 5%resulted in the greatest reduction of soil bioavailable Cd and ***-ground biomass yields were greatest with beef cattle manure biochar applied at 2.5%with 5%compost,or with 5%biochar at 2.5%and 5%compost *** microbial biomass was achieved with 5%poultry litter biochar and 5%compost,and microbial communities in soils amended with poultry litter biochar distinctly clustered away from all other soil ***,poultry litter biochar amended soils had the highest enzyme activity rates forβ-glucosidase,N-acetyl-β-D-glucosaminidase,and *** results suggest that soil reclamation using biochar and compost can improve mine-impacted soil biogeophysical characteristics,and potentially improve future remediation efforts.

关键词： Biochar Compost Microbial response Mine soil reclamation Plant growth

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Yield and uptake of bahiagrass under flooded environment as affected by nitrogen fertilization

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Agricultural Sciences 2012年第4期3卷 491-500页

作者： gilbert C. sigua Mimi M. Williams Chad C. Chase Jr. Joseph Albano Manoch Kongchum United States Department of Agriculture-Agricultural Research Service Brooksville United States Department of Agriculture-Natural Resources and Conservation Service Brooksville United States Department of Agriculture-Agricultural Research Service Fort Pierce School of Plant Environmental and Soil Sciences Louisiana State University Agricultural Center Baton Rouge LA 70803

Bahiagrass (Paspalum notatum) is one of the most important forage grasses in subtropical region of USA and other tropical regions of the world. Although tolerant to short term flooding, bahiagrass is classified as a facultative upland (FACU+) species that suggest yield and plant persistence might be reduced under periods of extended waterlogging. The objective of this greenhouse study (2008-2009) was to determine the effect of nitrogen fertilization (0, 100, and 200 kg·N·ha–1) on yield (DMY), crude protein content (CPC), and nitrogen uptake (NUP) of bahiagrass under varying flooded conditions (0, 14, 28, 56, and 84 days). Results disclosed an overwhelming effect of N application on yield and uptake component of bahiagrass. Averaged across flooding duration, results showed that DMY (R2 = 0.91**), CPC (R2= 0.96**), and NUP (R2 = 0.99**) were linearly related to increasing levels of N fertilization. Plants without N fertilization that were submerged between 14 to 84 days had significantly lower amount of DMY when compared with plants that were fertilized with 100 or 200 kg·N·ha–1. Comparable DMY and NUP were obtained between plants fertilized with 200 kg·N·ha–1) at 0 day of flooding (11.7 ± 5.0 ton·ha–1) and plants fertilized with 200 kg·N·ha–1 at 84 days of flooding (9.8 ± 2.7 ton·ha–1). The practical implication of this study is that waterlogging may hamper yield and uptake while nitrogen fertilization could improve yield and uptake of bahiagrass under waterlogged condition.

关键词： Bahiagrass Flooding Nitrogen Uptake Dry Matter Yield Nitrogen

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Nitrogen recovery and agronomic efficiency of forages with nitrogen fertilization under flooded condition

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Agricultural Sciences 2013年第3期4卷 138-148页

作者： gilbert C. sigua Mimi M. Williams Chad C. Chase Jr. Janet Grabowski Manoch Kongchum United States Department of Agriculture Agricultural Research Service Florence USA United States Department of Agriculture Natural Resources Conservation Service Brooksville USA United States Department of Agriculture Agricultural Research Service Clay Center USA School of Plant Environmental and Soil Sciences Louisiana State University Agricultural Center Baton Rouge USA

The cow-calf (Bos taurus) industry in subtropical United States and other parts of the world that depends almost totally on grazed pastures is facing several production constraints like changing climatic conditions and increasing cost of fertilizers, especially nitrogen (N). Particularly little is known about the response of forage species to the combined effect of water-logging and the addition of N. A two-year greenhouse study was conducted in 2008 and 2009 to determine i) the effect of flooding duration on N recovery and agronomic efficiency of bahiagrass (Paspalum notatum Fluegge) compared with two flooding tolerant forages, limpograss (Hemarthria altissima Poir), and maidencane (Panicum hematomon Schult) and ii) if N fertilization could mitigate the negative effect of flooding. Nitrogen recovery and agronomic efficiency varied significantly (P ≤ 0.001) among forage species. Averaged across levels of N, N recovery of bahiagrass and limpograss was reduced by about 41% and 56%, respectively after 84 d of continued flooding while N recovery of maidencane was slightly increase by about 5% between 0 and 84 d of flooding. Agronomic efficiencies of bahiagrass (41% to 26%) and limpograss (44% to 31%) were reduced by flooding while agronomic efficiency of maidencane was increased from 24% (no flooding) to 46% at 84 d of continued flooding. However, N recovery and agronomic efficiency of three forage species was positively affected by N fertilization. The overall N recovery of bahiagrass, limpograss, and maidencane ranged from 44% to 59%. Nitrogen fertilization could improve N recovery and agronomic efficiency of forage species under waterlogged condition.

关键词： Forages Nitrogen Recovery Agronomic Efficiency Flooding Nitrogen

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Regional Distribution of Soil Phosphorus Across Congregation-Grazing Zones of Forage-Based Pastures with Cow-Calf Operations in Florida

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Journal of Environmental Protection 2011年第4期2卷 408-417页

作者： gilbert C. sigua Robert O. Myer Samuel W. Coleman Cheryl Mackowiak Martin Adjei Chad C. Chase Joseph Albano North Florida Research and Educational Center University of Florida Marianna United States Department of Agriculture-Agricultural Research Service Brooksville United States Department of Agriculture-Agricultural Research Service Fort Pierce University of Florida Range Cattle Research and Education Center Ona

The arrangement of supplemental feed, water, shelter, and their concurrent interactions with topographic features may influence the distribution of animals and their simultaneous use of pasture’s resources. The effects of grazing and/or congregation management that control phosphorus cycling and distribution have not been sufficiently evaluated. The objectives of this study were: 1) to determine whether cattle congregation sites typical on most Florida ranches, repre-sented by water troughs and shaded areas, are more phosphorus-rich and may contribute more soluble phosphorus to surface water run-off and groundwater than other pasture locations;and 2) to assess the regional distribution of Mehlich-1 extractable soil phosphorus (MP) across congregation-grazing zones of forage-based pastures with cow-calf operations in Florida. Soil samples were collected at increasing distance from congregations structures (water troughs and shades) in established (>10 yr), grazed beef cattle pastures located in three Florida regions. Samples were col-lected in the fall and spring of 2005, 2006, and 2007, respectively;following a radial (every 90 degrees) sampling pat-terns away from the center of the congregation structures. Averaged across years, MP and soil phosphorus saturation in the congregation zones were comparable (p ≤ 0.05) with MP values and soil phosphorus saturation in the grazing zones at all three Florida regions. Average MP at all three pasture locations did not exceed the crop requirement threshold of 50 mg P kg–1 and the water quality protection threshold of 150 mg P kg–1, suggesting that congregation zones in beef cattle pastures at all three regions of Florida are not phosphorus-rich.

关键词： Beef Cattle Congregation Structures Congregation Zone Grazing Zone Total Phosphorus Phosphorus Saturation Nutrient Management

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