Energy sorghum biomass harvest thresholds and tillage effects on soil organic carbon and bulk density

Meki, Manyowa N.; Snider, John L.; Kiniry, James R.; Raper, R. L.; Rocateli, Alexandre C.

doi:10.1016/j.indcrop.2012.07.033

Cited by 48 publications

(38 citation statements)

References 57 publications

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“…Companion management practices that enhanced system biomass inputs (e.g., increased fertilizer N rates, cover crop use) tended to ameliorate negative soil impacts of stover removal. Using a processbased crop model developed by USDA-ARS in Temple, TX called the Agricultural Land Management Alternatives with Numerical Assessment Criteria (ALMANAC) [103], model simulations with ALMANAC for biomass sorghum predicted that even when SOC levels were maintained under optimal residue and soil management practices (i.e., 75 % removal under no-till), soil physical properties (i.e., bulk density) still experienced degradation [104].…”

Section: System Sustainability and Climate Change Mitigation Potentialmentioning

confidence: 99%

Dedicated Energy Crops and Crop Residues for Bioenergy Feedstocks in the Central and Eastern USA

Mitchell¹,

et al. 2016

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Dedicated energy crops and crop residues will meet herbaceous feedstock demands for the new bioeconomy in the Central and Eastern USA. Perennial warm-season grasses and corn stover are well-suited to the eastern half of the USA and provide opportunities for expanding agricultural operations in the region. A suite of warm-season grasses and associated management practices have been developed by researchers from the Agricultural Research Service of the US Department of Agriculture (USDA) and collaborators associated with USDA Regional Biomass Research Centers. Second generation biofuel feedstocks provide an opportunity to increase the production of transportation fuels from recently fixed plant carbon rather than from fossil fuels. Although there is no "one-size-fitsall" bioenergy feedstock, crop residues like corn (Zea mays L.) stover are the most readily available bioenergy feedstocks. However, on marginally productive cropland, perennial grasses provide a feedstock supply while enhancing ecosystem services. Twenty-five years of research has demonstrated that perennial grasses like switchgrass (Panicum virgatum L.) are profitable and environmentally sustainable on marginally productive cropland in the western Corn Belt and Southeastern USA.

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Section: System Sustainability and Climate Change Mitigation Potentialmentioning

confidence: 99%

Dedicated Energy Crops and Crop Residues for Bioenergy Feedstocks in the Central and Eastern USA

Mitchell¹,

et al. 2016

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“…Reduced or no-tillage, planting of winter cover crops, and establishment of vegetative barriers are conservation practices that show great promise for reducing soil erosion and increasing soil organic carbon [10,[23][24][25][26]. Described in detail by English et al [27], these three conservation practices can have significant impacts on farmer-perceived costs of residue removal, soil erosion, and ultimately their likelihood of participating in biomass supply programs.…”

Section: Introductionmentioning

confidence: 99%

Modeled Impacts of Cover Crops and Vegetative Barriers on Corn Stover Availability and Soil Quality

et al. 2014

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Environmentally benign, economically viable, and socially acceptable agronomic strategies are needed to launch a sustainable lignocellulosic biofuel industry. Our objective was to demonstrate a landscape planning process that can ensure adequate supplies of corn (Zea mays L.) stover feedstock while protecting and improving soil quality. The Landscape Environmental Assessment Framework (LEAF) was used to develop land use strategies that were then scaled up for five U.S. Corn Belt states (Nebraska, Iowa, Illinois, Indiana, and Minnesota) to illustrate the impact that could be achieved. Our results show an annual sustainable stover supply of 194 million Mg without exceeding soil erosion T values or depleting soil organic carbon [i.e., soil conditioning index (SCI)>0] when no-till, winter cover crop, and vegetative barriers were incorporated into the landscape. A second, more rigorous conservation target was set to enhance soil quality while sustainably harvesting stover. By requiring erosion to be <1/2 T and the SCI-organic matter (OM) subfactor to be >0, the annual sustainable quantity of harvestable stover dropped to148 million Mg. Examining removal rates by state and soil resource showed that soil capability class and slope generally determined the effectiveness of the three conservation practices and the resulting sustainable harvest rate. This emphasizes that sustainable biomass harvest must be based on subfield management decisions to ensure soil resources are conserved or enhanced, while providing sufficient biomass feedstock to support the economic growth of bioenergy enterprises.

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“…A manutenção de resíduos vegetais em superfície e ausência de revolvimento do solo promove maior retenção de nutrientes, como o K, cálcio (Ca) e magnésio (Mg), e pode atuar como reservatório de nitrogênio (N), fósforo (P) e enxofre (S), capaz de suprir parte das necessidades da cultura durante seu ciclo (CALEGARI, 2004). Segundo Meki et al (2013), a remoção a longo prazo da palhada sobre o solo resultou em rendimentos reduzidos de biomassa total ao longo do tempo devido ao esgota-mento de nutrientes que poderia ser atribuído à mineralização reduzida, às perdas e talvez imobilização do nitrogênio (N).…”

Section: Resultsunclassified

Adubação Potássica Em Híbridos De Sorgo Forrageiro Cultivados Em Sistemas De Manejo Do Solo Na Amazônia Oriental

et al. 2015

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RESUMO: O sorgo é cultivado em áreas e situações ambientais muito secas e/ou muito quentes, onde a produtividade de outros cereais é antieconômica. O objetivo foi avaliar a produção de três híbridos de sorgo em razão de doses de potássio e de sistemas de manejo, cultivados em Latossolo Amarelo da região da Amazônia Oriental. O delineamento experimental foi em blocos casualizados, arranjados em esquema fatorial 4 x 3 x 2, com quatro repetições. Os fatores foram: quatro doses de potássio (50, 100, 200 e 300 kg ha-1) na forma de KCl; três híbridos de sorgo (Qualimax, Volumax e AG 2005-E); e dois sistemas de manejo (plantio direto e convencional). Os híbridos volumax e qualimax apresentaram maior produção de matéria seca da parte aérea do sorgo no sistema de plantio direto. Os teores de N, P, K, Ca e Mg no tecido foliar do sorgo foram maiores no plantio direto. As doses de potássio resultaram em maior produção de MSPA no plantio direto, com redução de 40% do adubo potássico aplicado em relação ao plantio convencional.

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Energy sorghum biomass harvest thresholds and tillage effects on soil organic carbon and bulk density

Cited by 48 publications

References 57 publications

Dedicated Energy Crops and Crop Residues for Bioenergy Feedstocks in the Central and Eastern USA

Dedicated Energy Crops and Crop Residues for Bioenergy Feedstocks in the Central and Eastern USA

Modeled Impacts of Cover Crops and Vegetative Barriers on Corn Stover Availability and Soil Quality

Adubação Potássica Em Híbridos De Sorgo Forrageiro Cultivados Em Sistemas De Manejo Do Solo Na Amazônia Oriental

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