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This presentation is part of: Crops: Oral

Simulation of the Impact of Diffuse Air Pollution from Road Transport During Bloom on Soybean Yield.

Richard W. Taylor1, Maria Labreveux2, and Carl P. Davis1. (1) University of Delaware, 152 Townsend Hall, Dept. of Plant and Soil Sciences, Newark, DE 19716-2170, (2) Delaware State University, Delaware State University, 1200 N Dupont Hwy, Dover, DE 19901

A study was initiated in 2004 in response to a farmer's observation of increased soybean yield where wind from traffic on an adjacent road frequently disturbed soybean plants. Several factors such as plant population and increased sunlight (edge or border effect) could have been responsible for larger plants with increased seed yield. The study was planted at the Univ. of Delaware Middletown Demonstration area using a randomized complete block with four replications. Treatments included three populations (3.28, 6.56, and 13.12 seeds per row meter on 19 cm row spacing) and disturbance in the morning (AM), evening (PM), both morning and evening (2X day-1), and a control. An exception was the highest population that was treated 2X day-1 only due to inadequate seed (the grower requested that seed saved from his field be used). Artificial disturbance was applied from the beginning of full bloom (R2) until beginning pod (R3) by using a leaf blower capable of creating 113 km hr-1 winds. Ideal rainfall resulted in excellent yields with higher yields at each plant population. Disturbance in the PM resulted in significantly higher yields (370 kg ha-1) at the two lowest populations.

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