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Journal of Agronomy

Year: 2018 | Volume: 17 | Issue: 4 | Page No.: 224-233
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Authors

Paul Hategekimana

Pitipong Thobunluepop

Pitipong Thobunluepop

Ed Saorobol

Nantawan Sarobol

Keywords

Background and Objective: Drought stress severely affects corn growth and development during its whole life cycle by altering cell division and leading to changes in plant morphology, reducing anthesis-silking interval and consequently results in poor yield. The aim of this research was to evaluate the adaptability of corn cultivars under various drought stress conditions at different growth stages. Materials and Methods: This research was conducted in green house condition during April to September 2017 at the Department of Agronomy, Faculty of Agriculture and Kasetsart University (KU). Four corn cultivars (SW4452, NS-3, NT6248 and NT7328) were tested under factorial in randomized complete block design (RCBD). There were three blocks where drought stress was executed in block wise. The block one executed at vegetative stage (30DAP), block two at flowering stage (60DAP) and block three at grain formation stage (76DAP).Drought stress adaptability of those cultivars at seedling stage was tested under growth chamber where germination data were collected on 21 days after germination. The physiological, morphological, roots properties and crop yield data were collected. Results: The result on maximum germination and T50 percentage showed highly statistical significant different at p<0.05 level for NT7328 and NT6248, respectively. The number of roots, root length, roots fresh and dry weight and root-shoots ratio was significantly different for Ns-3. Furthermore, the yield production (t h–1) according to the period imposed to drought stress were 4.06, 3.69 and 2.85 t h–1 for vegetative, flowering and grain formation stage. However high yield value within cultivars were 3.7, 3.4 and 2.6 and 4.2 t h–1 for SW4452, NS-3, NT6248 and NT7328, respectively. Conclusion: Finally the result showed high drought adaptability to NT7328 and SW4452 while NT6248 cultivars was seems to be vulnerable to drought stress.
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