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Title: The growth and development of the winter barley crop
Author: Grant, David A.
ISNI:       0000 0001 3511 0670
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1985
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The growth and development of both six-row and two-row winter barley varieties was studied in field trials in two seasons near Edinburgh. The rate at which the crop passed through development stages was closely related to temperature. For some aspects of development the date of sowing (ie photoperiod) was also important. The agrochemical industry produces recommendations for applying hormonal chemicals based upon plant growth stage. Unfortunately external plant morphology could not be used as a guide to apical deve- lopment; floral initiation occurred with as few as two or as many as five leaves unfolded on the mainstem. Poor winter hardiness and leaf death were correlated with low levels of water soluble carbohydrate. For all sowings the green area index (GAI) reached by the start of stem elongation was 1.0 ± 0.3. From this time until its maximum value the GAI increased linearly in thermal time. Over much of the season crop growth rate was closely related to the rate at which photosynthetically active radiation (PAR) was absorbed. The six -row cultivars partitioned more dry matter to the ear than the two-row's, giving the six -row types a higher harvest index and higher grain yield. Growing conditions before anthesis had a greater effect on grain yield than conditions afterwards. A positive correlation between absorbed PAR after anthesis and grain yield was not a causal relationship since it was based upon an increase in grain number rather than grain size. There was little difference in the tillering behaviour of the six -row and two -row cultivars before mainstem elongation. Differences in final ear population were due to poor tiller survival in the six - row cultivars.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Agronomy