Early Prediction of Soybean Yield from Canopy Reflectance Measurements
B. L. Ma*,a,
Lianne M. Dwyera,
Carlos Costab,
Elroy R. Cobera and
Malcolm J. Morrisona
a Eastern Cereal and Oilseed Res. Cent. (ECORC), Central Exp. Farm, Agric. and Agri-Food Canada, Res. Branch, 960 Carling Ave., Ottawa, ON, K1A 0C6 Canada
b Univ. of Passo Fundo, Passo Fundo, RS, 99001-970, Brazil
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Fig. 1. Daily minimum and maximum temperatures and total rainfall during 1998 and 1999 growing seasons. Arrows indicate the dates of canopy reflectance measurements.
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Fig. 2. Grain yield of soybean cultivars as a power function of canopy reflectance expressed as normalized difference vegetation index (NDVI), measured at R5 stage in 1998 on (A) Granby sand loam and (B) North Gower clay loam. Data points are the means of 18 measurements (3 blocks x 3 densities x 2 subsamples).
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Fig. 3. Grain yield of soybean cultivars as a power function of canopy reflectance expressed as normalized difference vegetation index (NDVI), measured at R5 stage in 1999 on (A) North Gower clay loam and (B) Uplands sandy loam. Data points are the means of 18 measurements (3 blocks x 3 densities x 2 subsamples).
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Copyright © 2001 by the American Society of Agronomy.
