The investigation was concerned with the effects of water stress on the yield and yield components of wheat grown under rainfed conditions in Rawalakot, Pakistan. A pot experiment was conducted with four wheat genotypes, Inqlab-91, Chakwal-97, Rawal-87 and Kohsar-95, tested against five irrigation levels with drought imposed at different growth stages including control, terminal drought, post-anthesis drought, three irrigations and pre-anthesis drought. The parameters studied were flag leaf area, ear stalk length, number of grains per spike and grain yield per pot. Flag leaf area and ear stalk length exhibited a significant reduction of 14 and 36%, respectively, when wheat was subjected to water stress. The proportional reduction in yield was 40% with three irrigations and 98% in the case of pre-anthesis drought depending upon the extent and degree of stress. Results showed that wheat could withstand and tolerate drought only up to anthesis, after which water stress resulted in the complete failure of the crop. It could be deduced that the critical stage for moisture in wheat started 60 days after germination, and became more severe at 90 days, i.e. at the anthesis stage. Among the genotypes, Inqlab-91 was found to be more tolerant of drought and could thus be a good option for further testing and recommendation for rainfed areas.
Ahmed, N., Rashid, M., Vaees, A. G. 1996: Fertilizers and their Use in Pakistan. NFDC Publication No 4/96. Planning Commission NFDC, Islamabad, Pakistan. pp. 172-175.
Kramer, P. J., Boyer, J. S. 1995: Water Relations of Plants and Soils. Academic Press, San Diego.
Larson, K. L. 1992: Drought injury and resistance of crop plants. pp. 146-165, In: Gupta, U. S. (ed.), Physiological Aspects of Dryland Farming. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi, India.
Drought injury and resistance of crop plants., () 146-165.
Drought injury and resistance of crop plants.146165)| false
Turner, N. C., Nicolas, M. E. 1987: Drought resistance of wheat for light-textured climate. pp. 203-216. In: Srivastava, J. P., Proceddu, E., Acevedo, E., Varma, S.(eds.), Drought Tolerance in Winter Cereals. John Wiley and Sons, New York.
Drought resistance of wheat for light-textured climate., () 203-216.
Drought resistance of wheat for light-textured climate.203216)| false
Blum, A. 1983: Breeding programs improving drought resistance to water stress. pp. 263-275. In: Raper, C. D. Jr., Kramer, P. J.(eds.), Crop Reaction to Water and Temperature Stresses in Humid, Temperate Climates. Westview Press, Boulder, Colorado, USA.
Breeding programs improving drought resistance to water stress., () 263-275.
Breeding programs improving drought resistance to water stress.263275)| false