Nitrogen Fertilization and Harvest Timing Affect Switchgrass Quality

Massey, Joshua; Antonângelo, João Arthur; Zhang, Hailin

doi:10.3390/resources9060061

Cited by 3 publications

(1 citation statement)

References 49 publications

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“…The differences between forage and bioenergy production systems result in different needs for biomass estimation from remote sensing models. For example, a forage production system may include a single or two-cut harvest regime, and harvest timing (early or midseason) will be based on optimizing nutrient and crude protein concentrations to improve feed quality [34][35][36]. Under a sustainable bioenergy production system, perennial grass biomass is typically harvested once after senescence or a killing frost at the end of each growing season to allow for nutrients to translocate to belowground tissues, thereby reducing the next season's nutrient requirements and improving stand longevity [7,[37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing-Based Estimation of Advanced Perennial Grass Biomass Yields for Bioenergy

Hamada

Zumpf

Cacho

et al. 2021

Land

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A sustainable bioeconomy would require growing high-yielding bioenergy crops on marginal agricultural areas with minimal inputs. To determine the cost competitiveness and environmental sustainability of such production systems, reliably estimating biomass yield is critical. However, because marginal areas are often small and spread across the landscape, yield estimation using traditional approaches is costly and time-consuming. This paper demonstrates the (1) initial investigation of optical remote sensing for predicting perennial bioenergy grass yields at harvest using a linear regression model with the green normalized difference vegetation index (GNDVI) derived from Sentinel-2 imagery and (2) evaluation of the model’s performance using data from five U.S. Midwest field sites. The linear regression model using midsummer GNDVI predicted yields at harvest with R2 as high as 0.879 and a mean absolute error and root mean squared error as low as 0.539 Mg/ha and 0.616 Mg/ha, respectively, except for the establishment year. Perennial bioenergy grass yields may be predicted 152 days before the harvest date on average, except for the establishment year. The green spectral band showed a greater contribution for predicting yields than the red band, which is indicative of increased chlorophyll content during the early growing season. Although additional testing is warranted, this study showed a great promise for a remote sensing approach for forecasting perennial bioenergy grass yields to support critical economic and logistical decisions of bioeconomy stakeholders.

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Section: Introductionmentioning

confidence: 99%

Remote Sensing-Based Estimation of Advanced Perennial Grass Biomass Yields for Bioenergy

Hamada

Zumpf

Cacho

et al. 2021

Land

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Decreasing the cutting height increases young and mature switchgrass yield with no impact on quality and stand vigor at different harvesting seasons

Koduru,

Gorlitsky,

Hashemi

et al. 2024

Biomass and Bioenergy

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Digestate as a Source of Nutrients: Nitrogen and Its Fractions

Czekała

2022

Water

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Due to fossil-fuel-limitation constraints, new energy sources are being sought. On the other hand, organic fertilizers that can be used in agriculture are increasingly being sought. One of the renewable energy sources is biogas produced from substrates large in organic matter. Apart from biogas, the product of the anaerobic digestion process is digestate. Due to the high content of nutrients, mainly nitrogen, this product can be successfully used as a fertilizer. This study aims to determine the content of total nitrogen (Ntot) and its selected fractions in the raw and processed digestate from agricultural biogas plants. The nitrogen fractions included N-NH4, N-NO3, and Norganic. The total nitrogen content (Ntot) and its fraction in raw digestate were determined. Samples used for the research came from five agricultural biogas plants. Separation into liquid and solid fractions is one of the methods for digestate management. The nitrogen content in selected samples obtained after separation of digestate in a biogas plant and on a laboratory scale was also checked. The obtained results show that digestate from agricultural biogas plants is a nitrogen-rich fertilizer. The content of Ntot in the tested samples ranged from 1.63 g∙kg−1 to 13.22 g∙kg−1 FM. The N-NH4 content in the analyzed material ranged from 0.75 to 4.75 g∙kg−1 FM. The determined physical and chemical properties confirm that the raw and processed digestate is characterized by appropriate fertilization properties, with particular emphasis on the content of Ntot and the share of its mineral forms. Based on the chemical composition, digestate from agricultural biogas plants can be considered a multi-component fertilizer.

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Nitrogen Fertilization and Harvest Timing Affect Switchgrass Quality

Cited by 3 publications

References 49 publications

Remote Sensing-Based Estimation of Advanced Perennial Grass Biomass Yields for Bioenergy

Remote Sensing-Based Estimation of Advanced Perennial Grass Biomass Yields for Bioenergy

Decreasing the cutting height increases young and mature switchgrass yield with no impact on quality and stand vigor at different harvesting seasons

Digestate as a Source of Nutrients: Nitrogen and Its Fractions

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