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A detailed study has been made of the morphology of the spring.barley apex from shortly after germination to shortly before heading. The effects of 8- and 24-hr light periods and three levels of soil-moisture tension were examined with reference to the total number of primordia initiated on the main stem, the length of the apex, and the rate of spikelet development.
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Nicholls et al. (1963) studied this question.
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