Metadata
1) PRISM Yield
This dataset provides yield output from PRISM by resource and FIPS code. For herbaceous energy resources, it includes the average annual mature above-ground yield. For woody resources, such as poplar and willow, it provides the mean annual increment (MAI).
Note: This dataset does not include harvest efficiency, scenario improvement factors, planting year, harvest year, or the annual yield factor.
File: agyield_prism.csv.zip
Field definitions are as follows:
resource: crop or resource.
FIPS: county FIPS code.
yieldPRISM: theoretical mature annual yield from PRISM for the county FIPS code.
yieldUnit: yield value unit.
_id_: identifier.
2) Base Harvestable MAI
This dataset contains the average annual yield over the rotation period by resource and FIPS code, for both herbaceous and woody energy resources. It is derived from the PRISM yield data and incorporates the annual yield factor and harvest efficiency. However, it does not account for scenario-based improvements.
Yield = PRISM yield X Harvest Efficiency X Average Annual Yield Factor
File: agyield_base_harv_mai.csv.zip
Field definitions are as follows:
resource: crop or resource.
FIPS: county FIPS code.
yieldPRISM: theoretical mature annual yield from PRISM. This value can be found in the PRISM yield table, and it is used in this yield calculation.
harvestEfficiency: harvest efficiency for the crop.
meanAnnualYieldFactor: yield factor from the Mean Annual Yield Factor table for the crop and FIPS.
yield: calculated by multiplying the PRISM yield, harvest efficiency, and average annual yield factor.
yieldUnit: yield value unit.
_id_: identifier
3) Mature Harvestable Yield (or MAI) by Scenario
This dataset provides the mature harvestable yield for the energy resources and has been divided into two files: one for herbaceous crops (herb) and one for woody crops (SRWC):
Files:
Stand_Mature_Harvestable_Scenario_Yield_Herb.txt
StandMature_Harvestable_Scenario_Yield_Herb.zip, 5.74 MB
Stand_Mature_Harvestable_Scenario_MAI_SRWC.txt
StandMature_Harvestable_Scenario_MAI_SRWC.zip, 3.42 MB
This yield calculation begins with the PRISM yield and accounts for yield loss due to harvesting, as well as cumulative yield improvements based on the scenario and planting year. The scenario factor for future yield improvements depends on both the scenario and the crop’s planting.
Note: This dataset does not include the annual yield factor.
Yield [scenario, planted year] =
PRISM yield X Harvest Efficiency X Sum of Yield Improvements [scenario, planted year
Field definitions are as follows:
resource: crop or resource.
scenario: BT23 scenario which effects the scenario factor.
FIPS: county FIPS code.
plantYear: planted year.
yieldPRISM: theoretical mature annual yield from PRISM. This value can be found in the PRISM yield table, and it is used in this yield calculation.
harvestEfficiency: harvest efficiency for the crop.
scenarioFactor: sum of the yield improvements up through the planting year based on the scenario.
yield: this yield is calculated by multiplying the PRISM yield, harvest efficiency, and scenario factor.
yieldUnit: yield value unit.
_id_: identifier
4) Harvestable Yield for the Complete Crop Rotation by Scenario
This dataset provides the mature harvestable yield over the complete stand rotation for energy resources. It is provided by three files:
Files:
StandComplete_Harvestable_Scenario_Yield_Herb.txt (herbaceous crops)
StandComplete_Harvestable_Scenairo_Yield_Herb_Biomass_sorghum.zip, 1.82 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Energy_cane.zip, 2.53 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Miscanthus_High.zip, 5.16 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Miscanthus_Low.zip, 4.66 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Miscanthus_Med.zip, 5.1 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Switchgrass_High.zip, 4.24 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Switchgrass_Low.zip, 3.72 MB
StandComplete_Harvestable_Scenairo_Yield_Herb_Switchgrass_Med.zip, 4.23 MB
StandComplete_Harvestable_Scenario_MAI_SRWC.txt (woody crops - MAI)
StandComplete_Harvestable_Scenario_MAI_SRWC_Poplar_High.zip, 3.34 MB
StandComplete_Harvestable_Scenario_MAI_SRWC_Poplar_Low.zip, 2.85 MB
StandComplete_Harvestable_Scenario_MAI_SRWC_Poplar_Med.zip, 3.32 MB
StandComplete_Harvestable_Scenario_MAI_SRWC_Willow_High.zip, 5.16 MB
StandComplete_Harvestable_Scenario_MAI_SRWC_Willow_Low.zip, 4.68 MB
StandComplete_Harvestable_Scenario_MAI_SRWC_Willow_Med.zip,
StandComplete_Harvestable_Scenario_Yield_SRWC.txt (woody crops – harvestable yield)
StandComplete_Harvestable_Scenairo_Yield_SRWC.zip, 5.04 MB
This yield calculation begins with the PRISM yield and incorporates the following:
yield loss from harvesting
Cumulative yield improvements over time, based on the scenario and the planting year
Annual Yield Factor, which adjusts harvestable yield based on harvest age
Since the scenario factor for future yield improvements depends on the scenario and planting year, the mature yield remains fixed once the acreage is planted. The dataset provides harvestable yield values based on the planting year and harvest year, incorporating the Annual Yield Factor as a function of harvest age.
Yield [scenario, year planted, harvest age] = PRISM yield X Harvest Efficiency X Sum of Yield Improvements [scenario, year planted] X Annual Yield Factor [harvest age]
Field definitions are as follows:
resource: crop or resource.
scenario: BT23 scenario which effects the scenario factor.
FIPS: county FIPS code.
plantYear: planted year.
yieldPRISM: theoretical mature annual yield from PRISM. This value can be found in the PRISM yield table, and it is used in this yield calculation.
harvestEfficiency: harvest efficiency for the crop.
scenarioFactor: sum of the yield improvements up through the planting year based on the scenario.
harvestYear: harvest year.
harvestAge: harvest age.
yield: this yield is calculated by multiplying the PRISM yield, harvest efficiency, scenario factor as a function of the year it was planted, and average annual yield factor. The MAI yield is calculated by multiplying the PRISM yield, harvest efficiency, scenario factor as a function of the year it was planted, and average annual yield factor.
yieldUnit: yield value unit.
_id_: Identifier
5) Solution Yield by Scenario
This dataset provides the calculated yield from POLYSYS output files for energy resources. It has been divided into two files:
Files: agyield_solution_herb.csv.zip, agyield_solution_srwc.csv.zip,
The solution yield is derived from POLYSYS solution output files. The yield for each resource, simulation, and year is calculated by dividing the total amount harvested ("PRODUCTION") by the total acres harvested ("HARVEST") from the POLYSYS production files:
Yield [scenario, year] = Tons harvested [year] / Acres harvested [year]
This dataset includes the scenarios for each price for the Low, Medium, and High scenarios.
Field definitions are as follows:
resource: crop or resource.
siml: scenario ran including price offered.
year: simulation year.
FIPS: county FIPS code.
footprintArea: total footprint area of the resource that simulation year.
harvestedArea: total area harvested of the resource that simulation year.
production: amount of feedstock harvested that simulation year.
yield: comes from POLYSYS solution output and is calculated annually by taking the production quantity divided by the harvested area.
landSource: land source.
footprintAreaUnit: footprint area unit.
harvestedAreaUnit: harvested area units.
productionUnit: production quantity units.
yieldUnit: yield value unit.
_id_: identifier.
Definitions
Harvest Efficiency refers to the portion of total yield that is successfully harvested, accounting for losses due to harvesting methods. It is used to adjust the yield calculation by reflecting the actual amount of feedstock that could be harvested from the potential yield.
Annual Yield Factor refers to a multiplier used in yield calculations to adjust the total yield based on the age of the crop at the time of harvest. It reflects the expected changes in crop productivity as the crop matures, modifying the yield for each specific harvest age throughout the crop’s total rotation.
Average Annual Yield Factor is a factor used to account for the average yield over the entire rotation period of the crop, considering variations in yield across different harvest ages. It averages the yield factors for each year of the crop's rotation to estimate the overall yield potential over the rotation.
References
Daly, Christopher, Michael D. Halbleib, David B. Hannaway, and Laurence M. Eaton. “Environmental Limitation Mapping of Potential Biomass Resources across the Conterminous United States.” GCB Bioenergy, no. 10 (2018): 717–34. https://doi.org/10.1111/gcbb.12496.
Lee, Do Kyoung, Ezra Aberle, Eric K. Anderson, William Anderson, Brian S. Baldwin, David Baltensperger, Michael Barrett, et al. “Biomass Production of Herbaceous Energy Crops in the United States: Field Trial Results and Yield Potential Maps from the Multiyear Regional Feedstock Partnership.” GCB Bioenergy 10, no. 10 (2018): 698–716. https://doi.org/10.1111/gcbb.12493.
Volk, T. A., B. Berguson, C. Daly, M. Halbleib, R. Miller, T. Rials, L. Abrahamson, et al. “Poplar and Shrub Willow Energy Crops in the United States: Field Trial Results from the Multiyear Regional Feedstock Partnership and Yield Potential Maps Based on the PRISM-ELM Model.” GCB Bioenergy, 2018. https://doi.org/10.1111/gcbb.12498.
USDOE. “High-Yield Scenario Workshop Series,” 2009. INL/EXT-10-20074. https://bioenergy.inl.gov/SitePages/High-Yield%20Scenario%20Workshop.aspx