Original Articles

The influence of photoperiod and temperature on the pre-flowering phase length of eleven soybean cultivars in northern Natal

Published in: South African Journal of Plant and Soil
Volume 3, issue 2, 1986 , pages: 61–65
DOI: 10.1080/02571862.1986.10634190
Author(s): J. ChapmanAgricultural Research Station,

Abstract

The effect of photoperiod and temperature on the pre-flowering phase length of 11 soybean cultivars was studied. Heat units (10 to 30°C) and night hours (sunset to sunrise) were used as measures of temperature and photoperiod respectively. Highly significant negative correlations were found between pre-flower phase length and heat units, especially in the early cultivars. Indications of an interaction between photoperiod and temperature were observed. Partial correlation analyses indicated that in respect of days to flowering, the medium and late cultivars were equally responsive to photoperiod and temperature. The early cultivars were more responsive to temperature. Photothermal units gave a measure of the interactive effects of photoperiod and temperature on the length of the pre-flower phase. Highly significant correlations between days to flower and photothermal units were found.

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