NDRE uses a red edge filter to view the reflectance from the canopy of the crop. The red edge is a region in the red-NIR transition zone of vegetation reflectance spectrum and marks the boundary between absorption by chlorophyll in the red visible region, and scattering due to leaf internal structure in the NIR region. This allows you to determine many different variables with crop management. Understanding the levels of chlorophyll can provide you with the ability to monitor photosynthesis activity.
With this information you can optimize harvest times based on transitions of photosynthesis activity. During crop harvest events like: hull split in almonds, or max sugar content in grapes, a noticeable change in NDRE values occur. This change occurs because sugar molecules produced from photosynthesis are no longer needed in such a high demand since the fruit/nut has reached maturity. This provides you with a crop management tool for harvest scheduling to have the highest quality produce.
Other factors that can change chlorophyll levels and cause crop stress are insect infestations. By utilizing NDRE you can determine how severe a mite outbreak is for an almond field and then use a precise way to terminate the infestation. This not only allows you to monitor outbreaks, but also reduce costs associated with pest control.
Nitrogen fertilization methods and the application of fertilizer have become more critical to agriculture due to the increased price in fertilizer/fuel and increased restrictions. GNDVI displays and values provide you with a comprehensive way to apply your fertilizer. This means that fertilizer can be applied more precisely to target the areas of interest. This not only results in an economical benefit, but also an environmental benefit.