MATERIALS AND METHODS
Plant Crowth and Treatment
Tomatoes (Lycopersicon esculentum Mill. cv Sunny), cucumbers
(Cucumis sativa L. cv Flurry), and maize (Zea mays L.
cv Pioneer 3780) were grown in a greenhouse with approximately
16 h of supplemental light (700 pmol s-’ m-’, metal
halide) daily. Seeds were planted in 15-cm diameter clay pots
containing a soil mix, and the plants were thinned to two or
three per pot 8 to 10 d after emergence. Soluble fertilizer (20
N-8.6 P-16.6 K; 1.0 g L-’ Peters 20-20-20, W.R. Grace and
Co., Fogelsville, PA) was applied once or twice after planting
and again prior to treatment. The pots were labeled, randomized
for treatments within blocks, and isolated from each
other on the greenhouse bench. They were not disturbed for
several hours prior to initiation of the treatments.
Experiments were conducted so that the treatments were
unknown to the experimenters until after the tests were
MATERIALS AND METHODSPlant Crowth and TreatmentTomatoes (Lycopersicon esculentum Mill. cv Sunny), cucumbers(Cucumis sativa L. cv Flurry), and maize (Zea mays L.cv Pioneer 3780) were grown in a greenhouse with approximately16 h of supplemental light (700 pmol s-’ m-’, metalhalide) daily. Seeds were planted in 15-cm diameter clay potscontaining a soil mix, and the plants were thinned to two orthree per pot 8 to 10 d after emergence. Soluble fertilizer (20N-8.6 P-16.6 K; 1.0 g L-’ Peters 20-20-20, W.R. Grace andCo., Fogelsville, PA) was applied once or twice after plantingand again prior to treatment. The pots were labeled, randomizedfor treatments within blocks, and isolated from eachother on the greenhouse bench. They were not disturbed forseveral hours prior to initiation of the treatments.Experiments were conducted so that the treatments wereunknown to the experimenters until after the tests were
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