Response of “Alamo” switchgrass tissue chemistry and biomass to nitrogen fertilization in West Tennessee, USA

Garten, Charles T.; Brice, Deanne J.; Castro, Hector F.; Graham, R.L.; Mayes, Melanie A.; Phillips, Jana R.; Post, Wilfred M.; Schadt, Christopher W.; Wullschleger, Stan D.; Tyler, Donald D.; Jardine, P. M.; Jastrow, Julie D.; Matamala, Roser; Miller, R. M.; Moran, K. K.; Vugteveen, T. W.; Izaurralde, R. C.; Thomson, Allison M.; West, Tristram O.; Amonette, James E.; Bailey, Vanessa; Metting, F. B.; Smith, Jeffrey L.

doi:10.1016/j.agee.2010.12.016

Cited by 45 publications

(59 citation statements)

References 29 publications

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“…Aboveground nitrogen uptake was calculated from AAP, AGC, and nitrogen translocation (RFF) ( Table 2). Mid-summer nitrogen concentrations in switchgrass range between 7 and 16 g N kg −1 dry matter [17,31], but it has also been shown that nitrogen concentrations in biomass increase when switchgrass is fertilized with nitrogen [18,22,32,33]. Therefore, a relationship between aboveground nitrogen concentration (AGC) and fertilizer nitrogen additions Fig.…”

Section: Soil Nitrogenmentioning

confidence: 95%

“…Relatively large amounts of surface litter have been reported in some switchgrass studies [13,15,18]. Parameter FAR is highly dependent on harvesting equipment and its operation.…”

Section: Production Of Aboveground Biomassmentioning

confidence: 99%

“…Even though switchgrass production can exhibit considerable year-to-year variation [16,17], the default value for APP in the model was set to 900 g m −2 year −1 and is consistent with lowland switchgrass yields without nitrogen fertilization [18] as well as data from lower yielding lowland varieties [3].…”

Section: Production Of Aboveground Biomassmentioning

confidence: 99%

“…CNF was calculated from FFL and FCL and their respective root C/N ratios because both contribute directly to the fast soil carbon pool (Table 2). Root C/N ratios (CNC and CNR) decline with increasing nitrogen fertilization and separate regression equations were developed from field data [18] to predict fine and coarse root C/N ratios on the basis of nitrogen fertilization (Fig. 4).…”

Section: Soil Nitrogenmentioning

confidence: 99%

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Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)

Garten

2011

Bioenerg. Res.

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A multi-compartment model was developed to summarize existing data and predict soil carbon sequestration beneath switchgrass (Panicum virgatum) in the southeastern USA. Soil carbon sequestration is an important part of sustainable switchgrass production for bioenergy because soil organic matter promotes water retention, nutrient supply, and soil properties that minimize erosion. A literature review was undertaken for the purpose of model parameterization. A sensitivity analysis of the model indicated that predictions of soil carbon sequestration were affected most by changes in aboveground biomass production, the ratio of belowground-to-aboveground biomass production, and mean annual temperature. Simulations indicated that the annual rate of soil carbon sequestration approached steady state after a decade of switchgrass growth while predicted mineral soil carbon stocks were still increasing. A model-based experiment was performed to predict rates of soil carbon sequestration at different levels of nitrogen fertilization and initial soil carbon stocks (to a 30-cm depth). At a mean annual temperature of 13°C, the predicted rate of soil carbon sequestration varied from −28 to 114 g C m −2 year −1 (after 30 years) and was greater than zero in 11 of 12 simulations that varied initial surface soil carbon stocks from 1 to 5 kg C m −2 and nitrogen fertilization from 0 to 18 g N m −2 year −1 . The modeling indicated that more research is needed on the process of biomass allocation and on nitrogen loss from mature plantations, respectively, to improve our understanding of carbon and nitrogen dynamics in switchgrass agriculture.

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Section: Soil Nitrogenmentioning

confidence: 95%

“…Relatively large amounts of surface litter have been reported in some switchgrass studies [13,15,18]. Parameter FAR is highly dependent on harvesting equipment and its operation.…”

Section: Production Of Aboveground Biomassmentioning

confidence: 99%

Section: Production Of Aboveground Biomassmentioning

confidence: 99%

Section: Soil Nitrogenmentioning

confidence: 99%

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Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)

Garten

2011

Bioenerg. Res.

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“…Switchgrass stores up to 80 % of its mass belowground in the perennial root systems [22,23]. Switchgrass has low nitrogen (N) needs but responds to N fertilizer with increased biomass yields [5,24,25]. Annual removal of switchgrass requires nutrient replacement through fertilizer application.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Changes in Shoot and Root Nitrogen Distribution in Switchgrass (Panicum virgatum)

2013

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Switchgrass is a promising bioenergy source that is perennial, productive, native to a broad geographic region, and can grow on marginal, nitrogen (N)-poor soils. Understanding N dynamics in switchgrass is critical to predicting productivity, conserving N, and optimizing the timing of harvest. We examined seasonal changes in N distribution in above-and belowground tissues in switchgrass to quantify N retranslocation rates. Above-and belowground biomass from three sites (two in PA and one in NE) were collected and analyzed for biomass growth and N concentrations at 30-day intervals from June through October. Total living plant mass ranged from 10.3± 2.4 standard error (SE) to 14.9±2.5 SE Mg ha −1. Belowground mass comprised 52-57 % of total mass. Blades had the highest N concentration during summer, ranging from 6 to 22 g kg −1 N.

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Sustainable Cellulosic Grass Crop Production

Fike¹,

Parrish²,

Fike³

2013

Biofuel Crop Sustainability

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Response of “Alamo” switchgrass tissue chemistry and biomass to nitrogen fertilization in West Tennessee, USA

Cited by 45 publications

References 29 publications

Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)

Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)

Seasonal Changes in Shoot and Root Nitrogen Distribution in Switchgrass (Panicum virgatum)

Sustainable Cellulosic Grass Crop Production

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