Effect of Heat and Drought Stress on Sorghum (Sorghum Bicolor). II. Grain Yield

Craufurd, P Q and Peacock, J M (1993) Effect of Heat and Drought Stress on Sorghum (Sorghum Bicolor). II. Grain Yield. Experimental Agriculture, 29 (1). pp. 77-86.

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Three early and four later flowering lines of sorghum were subjected to three drought stress treatments (early, late and early plus late stress) in the field during the dry season at Hyderabad in India. Mean diurnal temperature and evaporation rate were uniformly high throughout the experiment. The late and early plus late stress conditions were severe, while the early stress was mild. Grain yield was affected by both the timing and the severity of the stress. The largest reduction (87%) in grain yield resulted from stress imposed during booting and flowering (late stress) in the early flowering lines; the same stress treatment on vegetative plants had no effect on grain yield. Increasing the duration of severe stress on vegetative plants (early plus late stress) reduced grain yield by 50–60%. Grain yield was strongly and positively correlated with the number of grains m-2. Variation in grain yield was associated with variation in total dry matter rather than with harvest index, which was only reduced when stress occurred at flowering. Treatment effects on thermal growth rates (g m-2 °Cd-1) during the phase from booting to flowering confirmed that growth during this phase is the major determinant of yield potential (number of grains). The importance of phonology in research into drought resistance is discussed

Item Type: Article
Subjects: Mandate crops > Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 27 Sep 2011 05:57
Last Modified: 27 Aug 2013 09:39
URI: http://oar.icrisat.org/id/eprint/1944
Official URL: http://dx.doi.org/10.1017/S0014479700020421
Acknowledgement: UNSPECIFIED
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