Fig. 4. (A) Spectral reflectance of maize tassels. Error bars correspond to one standard deviation. A typical reflectance spectrum of a healthy maize leaf is also shown for comparison. (B) Effect of the presence of maize tassels in reciprocal reflectance spectra of canopy. Spectral readings were obtained in the same spot before and after removing all the tassels within the field of view of the spectroradiometer. The dotted line represents the probability of a two-sample t test, performed at each wavelength (n = 10), to test whether there is a significant difference among reciprocal reflectance spectra of a canopy with tassels and that with the tassels removed. These analyses where performed after checking for variance homogeneity.