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Fig. 5. Data represent analysis of variance results between conventional (CT) and no-tillage (NT) treatments at the Piedmont study site for each remotely sensed index. Remotely sensed index values are listed along the primary y axis, percent change from initial surface conditions along the secondary y axis, and wavelength (485–1650 nm) along the x axis for remotely sensed data acquisitions on 19 Apr., 27 Apr., and 9 May 2005. Remotely sensed indices include the greenness normalized difference index (GNDVI), the normalized difference vegetation index (NDVI), crop residue index 1 [CRC1 = (1650 – 485 nm)/(1650 + 485 nm)], crop residue index 2 [CRC2 = (1650 – 650 nm)/(1650 + 650 nm)], and crop residue index 3 [CRC3 = (1650 – 660 nm)/(1650 + 660 nm)]. Significant treatment differences for each wavelength are denoted (*) (
= 0.10). Dashed lines represent minimum threshold values for distinguishing between treatments.
