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Browsing Cooperative Extension by Author "VanGessel, Mark J."
(Agricultural & Environmental Letters, 2022-06-14) Miller, Jarrod O.; Shober, Amy L.; VanGessel, Mark J.
Drone flights are often only performed during the growing season, with no data collected once harvest has been completed, although they could be used to measure winter annual weed growth. Using a drone mounted with a multispectral sensor, we flew small plot corn (Zea mays L.) fertility, cover crop, and population studies at black layer and 0–14 d after harvest (DAH). Yields had positive correlations to normalized difference vegetation index (NDVI) at black layer but often had negative correlations to corn yields 0–14 DAH. After harvest, NDVI could be associated with weed growth, and negative correlations to yield could point to reduced corn canopy allowing light to reach late-season weeds. In fertility studies, excess nitrogen appears to increase weed biomass after harvest, which can be easily identified through drone imagery. Flights should be performed after corn harvest as weed growth may provide additional insight into management decisions.
Core Ideas:
- Corn yields can be correlated to post-harvest weed biomass by using NDVI.
- Drone flights efficiently mapped weeds and made correlations to yield and management.
- Fall weed control can be prioritized using drone mapping.
Abbreviations:
DAH
days after harvest
LAI
leaf area index
NDVI
normalized difference vegetation index