Unmanned aerial vehicle imagery prediction of sorghum leaf area index under water stress, seeding density, and nitrogen fertilization conditions in the Sahel

• Published in: Agronomy journal 2024-05, Vol.116 (3), p.1003-1014
• Main Authors: Dembele, Joseph Sékou B., Gano, Boubacar, Mbaye, Modou, Doumbia, Mohamed, Dembele, Léonce Lamine, Kouressy, Mamoutou, Teme, Niaba, Vaksman, Michel, Diouf, Diaga, Audebert, Alain
• Format: Article
• Language: English
• Subjects: Agricultural sciences; Computer Science; Life Sciences; Modeling and Simulation; Sciences and technics of agriculture
• ISSN: 0002-1962; 1435-0645
• DOI: 10.1002/agj2.21547

Sahelian Africa must meet the challenge of providing enough food to meet its growing population. Therefore, novel breeding and intensive production methods are needed to mitigate this challenge. The objective of this study was to calibrate and validate sorghum varieties leaf area index (LAI) values estimated from Unmanned Aerial Vehicle (UAV) at different growing seasons in Senegal and Mali. To achieve this objective, four experiments were conducted with 14 sorghum (sorghum bicolor) varieties between 2017 and 2019. At the study sites, LAI was measured and crop reflectance was measured with a multispectral camera mounted on a UAV. The study showed that normalized difference vegetation index (NDVI) and simple ratio (SR) were highly correlated to the area index. The results of validation model revealed a better prediction of measured LAI from NDVI (R2 = 0.92) and SR (R2 = 0.89) vegetation indices in 2019 dry season in Senegal. In addition, the LAI predictions for Mali from NDVI (p