SOYBEAN HELIOTROPISM AND UVB DOSE ESTIMATION

摘要

Heliotropic movements were complex with leaf movements per hour exceeding solar movement. Williams 82 cv. had the greatest heliotropic response of the three cultivars, resulting in the greatest exposure to UVB under clear and hazy skies. The absence of significant differences in θ between the field and greenhouse plants indicates that the greenhouse environment does not inhibit the heliotropic response of the soybean plants. The larger a values for Williams cv. in the field is reflected in the higher UV dose calculated over the growing season. York and Bay cultivars showed less heliotropic movement and this is reflected in the lower UV doses over the same time period.