A portable chlorophyll meter (SP AD-502, Minolta Camera Co., Japan) was used
to measure the leaf greenness of the corn and soybean plants 5 days after foliar
application. For each treatment, the leaf greenness was measured and the readings were
taken on aIl the treated plants. For each plant, measurements were taken at four locations
on each leaf, two on each side of the midrib on all fully expanded leaves and then
averaged.