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This study was carried out to determine nitrogen, phosphorus, and potassium contents of rangeland plants using spectral reflectance value. The measurements were made in 1 m² area of different parts of a rangeland. A portable spectroradiometer capable of measuring the wavelength range of 325-1,075 nm of the electromagnetic spectrum was used to collect spectral data. Spectral measurements were made in a rangeland while nitrogen, phosphorus, and potassium content of the plants were determined in a laboratory. Stepwise linear regression was used to select wavelengths to investigate relationships between laboratory analysis results and spectral data. According to the result, significant relationships existed between predicted and measured nutrients, with R² values of 0.85, 0.43, and 0.84 for nitrogen, phosphorus and potassium, respectively. While 11 wavelengths (R₆₀₉,R₆₄₇,R₆₅₁,R₆₅₄,R₆₆₉,R₆₇₅, R₆₇₆,R₆₈₀, R₇₂₁,R₇₂₇,R₇₆₀ ) were used in the equation for estimating nitrogen level, 2 wavelengths (R_675, R₆₈₀) and fifteen wavelength (R_410, R_411, R_417, R_422, R_460, R_463, R_468, R_646, R_651, R_658, R_669, R_670, R_674, R_676, R₆₈₂) were determined for phosphorus and potassium levels, respectively. The results indicated that the changes in nitrogen, phosphorus, and potassium content affected reflectance values of the visible region of spectrum (especially in the red regions) and, therefore, spectral reflectance data could be used to estimate the nitrogen, phosphorus and potassium contents in rangeland plants.

Keywords: Plant nutrient elements, Rangeland, Remote Sensing, Spectral reflectance

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