Assessment of Photoperiod Sensitivity and the Effect of Sowing Date on Dry-Season Sorghum Cultivars in Southern Chad

Naoura, G and Emendack, Y and Sawadogo, N and Djirabaye, N and Tabo, R and Laza, H and Atchozou, E A (2023) Assessment of Photoperiod Sensitivity and the Effect of Sowing Date on Dry-Season Sorghum Cultivars in Southern Chad. Agronomy (TSI), 13 (3). pp. 1-16. ISSN 2073-4395

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Abstract

The cultivation of dry-season sorghum on residual moisture in West and Central Africa is highly affected by sowing dates and ecotypes used. Fifty-five dry-season sorghum ecotypes collected from three zones in southern Chadian were sown on two dates, early and late, in 2013 and 2014, in an α-Lattice, and replicated five times to evaluate the effect of sowing date on potential yield, flowering time, and other agro-morphological traits and to determine their photoperiod sensitivity. Trials were conducted in the research fields at the Agricultural Research Extension Farm in Youé, Chad. Year, sowing date, and their interaction significantly affected most of the assessed traits. Delaying sowing significantly decreased potential yield, duration of vegetative phase, and other agro-morphological traits, except staygreen. All cultivars were photoperiodic with late sowing requiring a lower cumulative growing degree unit to flower. The flowering window was not affected by sowing dates across cultivars; however, the flowering time was affected by a decrease in daylength, but not low night temperatures. Generally, late sowing decreased potential yield across cultivars. However, this decrease varied with the region of origin, with seven cultivars having average potential yields at or above the regional potential yield of 1 t/ha, irrespective of year or sowing dates.

Item Type:	Article
Divisions:	Research Program : West & Central Africa
CRP:	UNSPECIFIED
Uncontrolled Keywords:	dry-season sorghum, photoperiod sensitivity, temperature, daylength, growing degree units, potential yield
Subjects:	Mandate crops > Sorghum Others > Sustainable Development Others > Sub-Saharan Africa
Depositing User:	Mr Nagaraju T
Date Deposited:	19 Oct 2023 07:02
Last Modified:	19 Oct 2023 07:02
URI:	http://oar.icrisat.org/id/eprint/12226
Official URL:	https://www.mdpi.com/2073-4395/13/3/932
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors are grateful to Madjita Bruno, Ganezoune Michel, and Hinimbi Eli for their field and data collection assistance.
Links:	Google Scholar

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