Inventors:
Michael John Preiner - Palo Alto CA, US
Nicholas Carleton Koshnick - Palo Alto CA, US
Justin Stewart White - Palo Alto CA, US
John Paul Strachan - Millbrae CA, US
Assignee:
Solum, Inc. - Mountain View CA
International Classification:
G01N 21/00
US Classification:
356432, 356326, 356336, 356337, 2503418, 250281, 250255, 702 23, 702 22, 702 2, 702 5
Abstract:
The nitrate-nitrogen concentration in soil is estimated based on the nitrate-nitrogen 200 nm absorption peak. In one embodiment, a device measures the attenuation spectrum of a soil-extractant mixture over a wavelength range that includes wavelengths in the vicinity of the 200 nm absorption peak (the spectral operating range) and then determines the nitrate-nitrogen concentration based on the attenuation spectrum.