Assessing CO2 Exchange, Water Use and Yield of Maize Crops Under Full and Deficit Irrigation Using UAV And Satellite Imagery
Huihui Zhang, USDA-ARS, huihui.zhang@usda.gov (Presenter)
Andrew Schuh, Colorado State University, atmosschuh@gmail.com
Jose Chavez, Colorado State University, jose.chavez@colostate.edu
Kevin Yemoto, USDA-ARS, kevin.yemoto@usda.gov
Josh Wenz, USDA-ARS, joshua.wenz@usda.gov
Louise Comas, USDA, louise.comas@usda.gov
With increasing interest in understanding crop water use and carbon dioxide (CO2) exchange in agricultural ecosystems, various methods have been developed to monitor these processes at different spatial and temporal scales. In this study, an integrated approach was employed to investigate crop water use and CO2 exchange in maize under full and deficit irrigation at USDA-ARS Limited Irrigation Research Farm (LIRF) in Greeley, Colorado. The net ecosystem exchange (NEE) of CO2 between the crop and atmosphere and evapotranspiration (ET) were measured using an eddy covariance (EC) system and crop sap flow rate was measured by sap flow sensors. Additionally, Unmanned Aerial Vehicle (UAV) multispectral and thermal imagery, and Planet/Sentinel satellite imagery were acquired to assess crop growth and water stress. Our preliminary results showed significant relationships between NEE and sap flow rate at different growth stages, and strong correlations between UAV and Satellite (VI) and crop biomass, leaf area index, and yield. Our preliminary results show a significant relationship with increased NEE associated with increase sap flow rate, although the correlation was different at different growth stages. Significant correlations were found between UAV NDRE and daily average and mid-day NEE. Both UAV and Satellite vegetation indices (VIs) were highly correlated to crop biomass, leaf area index and yield. Next, combining UAV and satellite images for CO2 exchange, water use and yield prediction will be evaluated. Overall, the study aims to provide a valuable tool for monitoring and understanding crop water use and carbon dioxide exchange in agricultural ecosystems. The results can be used to inform and improve management practices, leading to more sustainable and efficient use of water resources in agriculture.
Poster: Poster_Zhang_2-2_111_35.pdf
Associated Project(s):
Poster Location ID: 2-2
Presentation Type: Poster
Session: Poster Session 2
Session Date: Wed (May 10) 5:15-7:15 PM
CCE Program: TE