Effect of Irrigation Regimes on Some Physiological, Morphological and Grain Yield of New Maize Hybrids

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Abstract

To investigate the effect of drought stress on some physiological, morphological and grain yield in eleven new maize hybrids, an experiment was arranged as split plot in complete randomized block design with three replicates in Seed and Plant Improvment Institute, Karaj, Iran in 2010 growing season. The experimental factors included three irrigation regimes as main plots (70, 100 and 130 mm evaporation from the surface of class A pan) and 14 maize hybrids as sub-plots (11 new maize hybrids and three commercial hybrids KSC700, KSC704 and KSC720 as control). Results showed that drought stress significantly reduced leaf area index (LAI), ear number plant-1, 1000 kernel weight and grain yield. leaf proline content. However, anthesis-silking interval (ASI) was significantly increased with increasing drought stress. Hybrid No.3 which is one of the new hybrids had the highest grain yield (6977.8 kg ha-1) and hybrid No.4 (KSC700 control) had the lowest grain yield (4653 kg ha-1). The highest grain weight: ear weight ratio (0.81) observed in two control hybrids (KSC700 and KSC704) and the lowest grain weight: ear weight ratio (0.72) was observed in hybrid No.12. Hybrid No.12 had the highest 1000 kernel weight (286.3 g), and the lowest 1000 kernel weight (236.7 g) was observed for hybrid No. 3. Hybride No. 3 is suggested suitable for further studies in future.

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Seed and Plant Production Journal
Volume 28, Issue 3
September 2012
Pages 347-362

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