Soil pH value, organic matter and macronutrients contents prediction using optical diffuse reflectance spectroscopy

Smoothing and Differentiation of Data by Simplified Least Squares Procedures.

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R. W. Kennard, L. A. Stone · Technometrics · 1969 · 3.4K citations

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Visible, near infrared, mid infrared or combined diffuse reflectance spectroscopy for simultaneous assessment of various soil properties

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Determination of nitrogen in soil by the Kjeldahl method

J. M. Bremner · The Journal of Agricultural Science · 1960 · 1.9K citations

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