Jai Prakash Meena and R.S. Verma
Department of Agronomy, College of Agriculture, G. B. Pant University of Agriculture & Technology, Pantnagar-263 145 (U.S. Nagar, Uttarakhand)
Email:-jaipee.meena12@gmail.com
Abstract: A field experiment was conducted at the Crop Research Center of Govind Ballabh Pant University of Agriculture & Technology, Pantnagar (Uttarakhand) during rabi season of 2008-09 to study the photosynthesis, growth and yield of wheat (Triticum aestivum L. emend. Fiori & Paol.) varieties at different sowing dates. The experiment was conducted in split plot design with 4 replications with treatments comprising six wheat varieties on Nov.14, Dec.4 and Dec.24. Delay in sowing adversely affected leaf area index. Reduction in leaf area index at 45, 60 and 75 day after sowing and at anthesis and two week after anthesis stage was observed due to late sowing. High leaf area index was noticed in variety UP 2526 at 75 day after sowing and at anthesis and variety DBW 17 followed by UP 2526 recorded highest leaf area index at two week after sowing. Heat susceptibility index computed for yield and yield attributes indicated that variety Raj 3765 was most heat tolerant variety. High grain yield of a genotype under late sown condition indicated the presence of gene for heat tolerance.
Keywords: Sowing date, Leaf area index, Mean Tilt angle, Heat susceptibility index, Yield
REFERENCES
Directorate of Wheat Research. (2008). Project Director’s Report : 2007-08. B. Mishra, Project Director, Directorate of Wheat Research, Karnal. 31 p.
Fisher, R.A. and Maurer, R. (1978). Drought resistance in wheat cultivars. I. Grain yield response. Australian Journal of Agriculture Research. 29: 897-907.
Mishra, Vipin Kumar. (2002). Studies on physiology of heat tolerance in different genotypes of wheat. Thesis, Ph.D. (Agronomy), G.B. Pant University of Agriculture and Technology, Pantnagar.
Pande, Puja. (2009). Physiological basis of yield differences among wheat varieties under timely and late sown conditions. Thesis, Ph.D. (Agronomy), G.B. Pant University of Agriculture and Technology, Pantnagar.
Rane, J. and Nagarajan, S. (2004).High temperature index for field evaluation of wheat tolerance in wheat varieties. Agricultural Systems. 79(2) : 243-255.
Singh, M.; Srivastava, P.; Srivastava, N.; Chaturvedi, K. and Singh, D. (2006).Photosynthetic characteristic of flag leaf and grain yield in differentially sown four cultivars of Triticum aestivum. Physiology and Molecular Biology of Plants.12: 329- 332.
Tripathi, Neeta. (2003). Studies on physiological parameters in relation to heat tolerance in eight wheat varieties. Thesis, M.Sc. Ag. (Agronomy), G.B. Pant University of Agriculture and Technology, Pantnagar.