Effect of water availability pattern on yield of pearl millet in semi-arid tropical environments

Oosterom, E.J. van and Bidinger, F.R. and Mahalakshmi, V. and Rao, K.P. (1996) Effect of water availability pattern on yield of pearl millet in semi-arid tropical environments. Euphytica, 89 (2). pp. 165-173.

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Throughout much of the semi-arid tropics, fluctuations in grain yield can largely be attributed to differences in timing and intensity of drought stress. Since seasonal rainfall in these environments is often poorly related to grain yield, the aim of this paper was to establish a relationship between water availability and grain yield for pearl millet (Pennisetum glaucum), grown across 24 semi-arid tropical environments in India. A simple soil water budget was used to calculate a water satisfaction index (WSI) throughout the season. The cumulative WSI at maturity explained 76% of the variance in grain yield. This was three times as much as explained by actual rainfall, because WSI accounted for differences in water losses and pan evaporation. A classification of environments into four groups of water availability patterns explained 75% of the environmental sum of squares for grain yield. For a subset of 13 environments, environmental differences in grain number could also be explained by water availability patterns, whereas differences in grain mass were related to both water availability and temperature. These results indicate that cumulative WSI, which is an integrated measure of plant-available water, can provide an adequate estimation of the environmental potential for yield in environments where grain yield is mainly limited by variable availability of water

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
Subjects: Plant Production > Production Practices
Crop Improvement > Plant Breeding
Divisions: Millet
Depositing User: Mr B Krishnamurthy
Date Deposited: 21 Apr 2011 05:47
Last Modified: 14 Jul 2011 09:54
Official URL: http://dx.doi.org/10.1007/BF00034602
URI: http://eprints.icrisat.ac.in/id/eprint/1867

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