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Evaluation the effect of irrigation regimes on growth indices of corn hybrids in spring and summer seasons in hot and dry climate of Khuzestan
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Saeed Zakernejad   , Ahmad Naderi * , Seyed Abolhasan Hashemidezfoli , Shahram Lack , Mojtaba Alavifazel |
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Abstract: (1592 Views) |
| The present research was conducted to investigate the effect of different irrigation regimes on growth physiological characteristics of corn hybrids according to split plot experiment based on randomized complete blocks design with three replications in spring and summer during 2014-2015 and 2015-2016 cropping years. The main factor included four different irrigation regimes and the sub factor included single cross 704, single cross 701 (Karun) and single cross 616 (Mobin) cultivars. The results of statistical analysis of data showed that in spring and summer cultivation, the effect of different irrigation regimes and hybrid on total dry matter and leaf area index, crop growth rate and net uptake rate, relative growth rate and leaf area durability were significant. The results of comparing the means showed that I2 treatment (irrigation of a furrow during the stages of 4 to 12 leaves and 12 leaves until the emergence of cob silk and conventional irrigation from the emergence of cob silk to maturity) had the lowest total dry matter, leaf area index, crop growth rate, net uptake rate, relative growth rate and leaf area durability and allocated the highest decrease in measured traits compared to treatment I1 or control (conventional irrigation). Therefore, low irrigation application is not recommended in the early and middle stages of growth (four leaves until the emergence of cob silk). The superiority of single cross 704 over other hybrids in agraphiological traits can be related to higher yield potential, early maturity and greater adaptation to environmental conditions. The results of comparing spring and summer cultivation showed significant difference in the measured traits (except for net uptake rate). Applying low irrigation in treatment I3 (irrigation one among furrows in 12-leaf stage until emergence of cob silk) had the least decrease in growth indices (compared to other low irrigation treatments) compared to conventional irrigation. Therefore, full irrigation in the stage of emergence of cob silk until seed maturity and low irrigation in the middle stages of growth (12 leaves until the emergence of silk leaves) is recommended as the most appropriate option to deal with limited water resources. |
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| Keywords: Cultivar, Leaf area index and Total dry matter. |
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Full-Text [PDF 857 kb]
(2003 Downloads)
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Type of Study: Applicable |
Subject:
Crop Physiology
Received: 2021/02/7 | Accepted: 2021/01/29 | Published: 2021/01/29
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