EFFECT OF DIFFERENT SOWING DATES ON GROWTH AND YIELD OF WHEAT (TRITICUM AESTIVUM) VARIETIES UNDER HUMID SUB TROPICAL ZONE OF UTTARAKHAND, INDIAJai Prakash Meena and R.S. VermaAbstract 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 and Paol.) varieties at different sowing dates. The experiment was conducted in split plot design with 4 replications with treatments comprising three dates of sowing viz, Nov. 14, Dec. 4 and Dec. 24 in main plots and 6 different wheat varieties viz. PBW 17, RAJ 3765, UP 2526, UP 2565, UP 2572 and UP 2584 in sub-plots. November 14 sown crop produced the highest grain yield (5.0 t ha1) followed by December 4 and December 24 (3.34 t ha1) sown crops. The grain yield obtained from all three dates significantly differed from each other. Variety UP 2565 (4.41 t ha1) recorded the highest grain yield and it was statistically at par with UP 2526, UP 2572 and Raj 3765. Variety Raj 3765 produced significantly higher grain yield than that of DBW 17 and UP 2584.
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