Data from: Switchgrass cultivar, yield, and nutrient removal responses to harvest timing

Principal Investigator(s):  View help for Principal Investigator(s) US Department of Agriculture; National Agricultural Library

Version:  View help for Version V1

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adc_metadata.json application/json 23.3 KB 06/26/2026 03:10:PM
catalog_detail.html text/html 13.8 KB 06/26/2026 11:31:AM
switchgrass-variety-nutrient-removal-data-dictionary_0.csv text/csv 820 bytes 06/26/2026 11:31:AM
variety_removal.csv text/csv 21.2 KB 06/26/2026 11:31:AM

Project Citation: 

US Department of Agriculture, and National Agricultural Library. Data from: Switchgrass cultivar, yield, and nutrient removal responses to harvest timing. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2026-06-26. https://doi.org/10.3886/E250281V1

Project Description

Project Title:  View help for Project Title Data from: Switchgrass cultivar, yield, and nutrient removal responses to harvest timing
Summary:  View help for Summary Finite nutrients, such as P and K are assumedly remobilized post-senescence in herbaceous feedstocks like switchgrass (Panicum virgatum L.) as a function of environmental signaling and genotype. Harvesting early during the maturation phase may result in yield reductions and higher nutrient removal in biomass depending on ecotype. Therefore, it is necessary to target harvest dates that optimize yield while minimizing nutrient removal per cultivar. Consequently, objectives were to compare yields from 2010–2011 on eight widely used and experimental upland and lowland genotype (whole plot) at two locations in Tennessee, to determine: (i) which harvest timing (split-plot) provides maximum yield; (ii) effects of harvest timing (mid-September, October, November, and late October) on overall total P and K removal; and, (iii) how results are affected by cultivar. Among all post-senescence harvests, yields peaked early November (13.2 Mg ha–1), which was greater than all other harvests (P < 0.05), with mid-October and late October not differing from one another. Because yields peaked in early November, P and K removal did not vary across harvest dates (despite both P and K concentrations declining mid-October). Lowland cultivars yielded 3.9 Mg ha–1 more biomass annually than upland entries, suggesting lowland cultivars are better suited to environments in the Southeast. Due to lower yields, P and K removals were lower for upland (Blackwell and C62), compared with lowland cultivars. Consequently, switchgrass can be harvested as early as mid-September without removing greater amounts of P and K, although variations within upland and lowland cultivars will likely occur.


Resources in this dataset:

Resource Title: Switchgrass variety nutrient removal. File Name: variety removal.csvResource Description: Switchgrass variety P and K tissue (leaves and stems) removal for fall harvest periods (mid-September, October, November, and late October), at East Tennessee and Highland Rim Research and Education Centers from 2010–2011.

Resource Title: Switchgrass variety nutrient removal.

File Name: variety removal.csv

Resource Description: Switchgrass variety P and K tissue (leaves and stems) removal for fall harvest periods (mid-September, October, November, and late October), at East Tennessee and Highland Rim Research and Education Centers from 2010–2011.

Resource Title: Data Dictionary. File Name: switchgrass-variety-nutrient-removal-data-dictionary.csvResource Description: Defines variables, units, and data types for the tabular data.

Resource Title: Data Dictionary.

File Name: switchgrass-variety-nutrient-removal-data-dictionary.csv

Resource Description: Defines variables, units, and data types for the tabular data.
Original Distribution URL:  View help for Original Distribution URL https://agdatacommons.nal.usda.gov/articles/dataset/Data_from_Switchgrass_cultivar_yield_and_nutrient_removal_responses_to_harvest_timing/24660825

Scope of Project

Subject Terms:  View help for Subject Terms nutrient remobilization; post-senescence; feedstocks; NP212; data.gov; ARS
Geographic Coverage:  View help for Geographic Coverage United States
Time Period(s):  View help for Time Period(s) 1/1/2010 – 12/31/2011
Data Type(s):  View help for Data Type(s) geographic information system (GIS) data
Collection Notes:  View help for Collection Notes DOI: 10.15482/USDA.ADC/1503715 Citation: Ashworth, Amanda (2019). Data from: Switchgrass cultivar, yield, and nutrient removal responses to harvest timing. Ag Data Commons. https://doi.org/10.15482/USDA.ADC/1503715 (Downloaded 2026-06-26)


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V1 [2026-06-26]

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