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

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.

Dataset Info

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FieldValue
Authors
Ashworth, Amanda
(ORCID)
Product Type
Dataset
Spatial / Geographical Coverage Area
POLYGON ((-88.054868 36.496384, -88.071299 36.677123, -87.852221 36.633308, -86.592525 36.655216, -85.486183 36.616877, -85.289013 36.627831, -84.544149 36.594969, -83.689746 36.584015, -83.673316 36.600446, -81.679709 36.589492, -81.723525 36.353984, -81.909741 36.304691, -82.03571 36.118475, -82.216449 36.156814, -82.610789 35.965121, -82.638174 36.063706, -82.775097 35.997983, -82.994175 35.773428, -83.251591 35.718659, -83.498053 35.565304, -83.7719 35.559827, -84.018363 35.41195, -84.09504 35.247642, -84.29221 35.225734, -84.319594 34.990226, -85.606675 34.984749, -87.359296 35.00118, -88.202745 34.995703, -88.471115 34.995703, -90.311367 34.995703, -90.212782 35.023087, -90.114197 35.198349, -90.130628 35.439335, -89.944412 35.603643, -89.911551 35.756997, -89.763673 35.811767, -89.730812 35.997983, -89.533642 36.249922, -89.539119 36.496384, -89.484349 36.496384, -89.418626 36.496384, -89.298133 36.507338, -88.054868 36.496384))
Spatial / Geographical Coverage Location
Tennessee
Temporal Coverage
2010/2011
Intended Use
To compare switchgrass yields as related to elevation, harvest timing, total P and K removal, and cultivar.
Publisher
Ag Data Commons
Contact Name
Ashworth, Amanda
Contact Email
Public Access Level
Public
Primary Article

Ashworth, A. J., Allen, F. L., Bacon, J. L., Sams, C. E., Hart, W. E., Grant, J. F., Moore, P. A., Jr., & Pote, D. H. (2017). Switchgrass cultivar, yield, and nutrient removal responses to harvest timing. Agronomy Journal, 109(6), 2598-2605.

License
Dataset DOI (digital object identifier)
10.15482/USDA.ADC/1503715
Program Code
005:037 - Department of Agriculture - Research and Education
Bureau Code
005:18 - Agricultural Research Service
Modified Date
2019-04-18
Release Date
2017-11-10
Ag Data Commons Keywords: 
  • Plants & Crops
  • Crop production
  • Plants & Crops
  • Traits
  • Genomics & Genetics
  • Variants
  • Plants & Crops
  • Agroecosystems & Environment
  • Management
State or Territory: