Fecha de publicación: -- Fuente: WIPO "tomato" An example soil nitrate sensing system includes: a suction lysimeter; a soil moisture sensor; a spectrometer; and a controller, wherein the controller is configured to: estimate a soil moisture measurement by the soil moisture sensor; based on the soil moisture measurement, acquire a water sample by the suction lysimeter; and estimate nitrate concentrations as NO3—N in the soil porewater sample using the spectrometer.