Handheld NDVI Sensor

A grower takes the handheld GreenSeeker into the field and pulls a trigger to turn on the sensor. The sensor emits brief bursts of red and infrared light and then measures the amount of light reflected back at the sensor. The strength of the light is an indicator of plant vigor. The sensor continues to sample the scanned area as long as the trigger is pulled. When the trigger is released, the GreenSeeker computes a health value of the crop. The value is measured in terms of a Normalized Difference Vegetation Index (NDVI) reading. The higher the NDVI value is, the healthier the crop. A low reading may indicate a nitrogen application is warranted.