Figure 2. The LIBS spectra of NPK soil sample (a) and of fallow land soil sample (b) in the spectral range of 340 nm to 348nm

From

Elemental Profiling and Identification of Eco-Toxic Elements in Agricultural Soil by Laser-Induced Breakdown Spectroscopy

Abul F.M.Y. Haider, Firoza Kabir, M. Hedayet Ullah, Z.H. Khan, Kazi M. Abedin

Applied Ecology and Environmental Sciences. 2013, 1(4), 41-44 doi:10.12691/aees-1-4-1