Maize plants were studied to see how their canopy reflectance changes under drought stress. The researchers found that under drought conditions, the canopy reflectance in the green and red wavelengths increased, while in the near-infrared band, it decreased. The red edge of the spectrum also shifted towards blue wavelengths. The study showed that as maize plants grow, their leaf area index (LAI) increases, with the highest LAI during the silking and milk stages. However, plants under drought stress had significantly lower LAI compared to well-watered plants during these stages. This research helps us understand how drought affects maize plants and could be useful for predicting crop yield.