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Near infrared spectra of three kinds of soils (A) 50 °C drying; (B) 80 °C drying; (C) 95 °C drying; (D) 25 °C placement. (a,d,g,j) are the black soil average spectrum at 50 °C, 80 °C, 95 °C drying and 25 °C placement respectively; (b,e,h,k) are the loess average spectrum at 50 °C, 80 °C, 95 °C drying and 25 °C placement respectively; (c,f,j,l) are the calcium soil average spectrum at 50 °C, 80 °C, 95 °C drying and 25 °C placement respectively.
