Abstract. Laser-Induced Breakdown Spectroscopy (LIBS) is a method for measuring level of
nitrogen (N) in the soil in the form of N-nitrate (NO3) rapidly without going through the process
of sieving and drying. The sample soil in the form of pellets subjected to laser pulses using a
wavelength of 532 nm, pulse duration 5.5 ns, repetition rate of 10 Hz, and Q-switch delay of 150
μs. Emissions are captured by the spectrometer with the wavelength range of 190-1130 nm.
Spectrum characterization was processed through the second derivative in order to obtain a
wavelength identity that could be rapidly used to estimate the nitrate content of the soil with a
determination coefficient of (R2
) 0.9254 and a coefficient of variation (CV) of 8.41%. The results
of this study are very potential to be applied for rapid measurement of soil nitrate