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- Title
Can We Select Sugarbeet Harvesting Dates Using Drone-based Vegetation Indices?
- Authors
Olson, Dan; Chatterjee, Amitava; Franzen, David W.
- Abstract
In the Northern Great Plains, sugarbeet (Beta vulgaris L.) harvesting is stretched out from August to October. Sensors mounted on unmanned aerial vehicles (UAVs) may provide the information needed to identify sugarbeet approaching an optimum harvesting date that maximizes the recoverable sugar yield. The objective of this study was to relate the vegetation indices at early- and late-harvest time with corresponding sugarbeet root yield, sugar concentration, and recoverable sugar yield (RSY) at three fields in the Red River Valley of North Dakota and Minnesota during 2017 and 2018. Vegetation indices was determined based on the multispectral imagery collected using UAV. Early harvest dates (19 Sept. 2017 and 21 Aug. 2018) reduced yield and RSY in 5 of 6 site-years, compared to late harvest dates (3 Oct. 2017, 4 Sept. 2018, and 18 Sept. 2018). In general, delaying harvest increased red normalized difference vegetation index (NDVI) and reduced red edge NDVI (RENDVI). However, Pearson correlation between yield and vegetation indices did not show consistent relationship across harvesting date, site, and growing season. Pooling all site-year data showed a significant relationship between RENDVI and yield and RSY. Use of in-season yield estimate (RENDVI/growing degree days) has potential to explain 46% of sugarbeet root yield and RSY.
- Subjects
GREAT Plains; NORTH Dakota; HARVESTING time; BEETS; HARVESTING; NORMALIZED difference vegetation index; SUGAR beets; DRONE aircraft; PLANTS
- Publication
Agronomy Journal, 2019, Vol 111, Issue 5, p2619
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj2019.03.0219