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An evaluation of heat unit requirenment in maize hybrids with different maturity groups in temperate region of Fars
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Rajab Choukan   |
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Abstract: (3957 Views) |
| Twenty Iranian and introduction maize hybrids in five different maturity groups were evaluated in Zarghan, Shiraz, for two cropping seasons (2007-2008). Variation in temperature were created by three planting dates (27 May, 5 June and 15 June). Duration to flowering was estimated by heat units using both thermal indices, GDD and CHU, were reliable for different maturing groups and led to similar grouping for maize hybrids. Both indices, based on heat units to flowering, grouped hybrids KSC 320, KSC 250, NS 540, and OSSK 552 as late floweiring and hybrids KSC 500, KSC 400, BC 504, and OSSK 444 as early flowering as compared to former FAO maturing groups. Based on duration to maturity, grouping based on GDD was more reliable and conformed with grouping based on estimation of duration from planting to flowering. |
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| Keywords: CHU, GDD, Heat units, Maize, Maturity group and Planting date |
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Full-Text [PDF 164 kb]
(1558 Downloads)
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Type of Study: Scientific & Research |
Subject:
Special
Received: 2015/02/17 | Accepted: 2015/02/17 | Published: 2015/02/17
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