The Green Normalized Difference Vegetation Index (GNDVI) is an index of plant "greenness" or photosynthetic activity, and is one of the most commonly used vegetation indices to determine water and nitrogen uptake into the crop canopy. See the "About NDVI" section for more information behind the science of the measurement but GNDVI basically replaces the red piece of standard NDVI collection with a very specific band of light in the green range to obtain different useful information.
Water is always becoming a more valuable resource that must be managed effectively. Obtaining frequent GNDVI displays from AAI allows for irrigation optimization and indicates when water isolation occurs or varies throughout the field in a glance. Utilizing this information along with the GPS coordinate information then going to the problem areas to determine solutions is very valuable and can help provide material application, grade correction or root stock improvement to make your fields more uniform in water retention and utilization.
Water is also a leading factor required for photosynthesis. Using GNDVI images you will be able to allocate your water in a more efficient way. This allows you to better determine how much water is needed per section of your property. This tool can be used to monitor the proper grade of the field to optimize flood row irrigation. For those of you that use drip irrigation this tool can assist you in finding a clogged drip line and better optimize how the drip irrigation is set up.
The GPS coordinate information used with the individual plant requirements allows for accurate variable rate spreading. This feature alone, when properly utilized, should more than pay for itself and the entire service in a single application.