Integration of environmental and spectral data for sunflower stress determination ( Minnesota).

Stress in sunflowers was assessed in W and NW Minnesota. Weekly ground observations (acquired in 1980 and 1981) were analyzed in concert with large scale aerial photography and concurrent Landsat data. Initial regression analyses to estimate sunflower seed yield showed a sensitivity to environmental stress during the flowering and seed development stages. One of the most important biological factors related to sunflower production in the Red River Valley area was found to be the extent and severity of insect infestations.- from NASA abstract E83-10211