INFLUENCE OF NITROGEN LEVELS ON GROWTH AND YIELD OF DIFFERENT VARIETIES OF WHEAT

Abstract

An experiment was carried out at the Agronomy Field of Sher-e-Bangla Agricultural University. Ohaka during November 2007 to March 2008 to evaluate the eftbct or variety and nitrogen levels on growth, yield attributes and yield of wheat. The treatments consisted of four nitrogen levels (0, 120, 160 and 200 kg ha d ) and three wheat cultivars (Shourav. Shatabdi and Protiva). The soil was clay loam. The experiment was laid out in a RCBD (Ictorial) design with three replications. Each plot received fertilizers @20 kg P. 60kg K. 10 kg S and 1.5 kg Zn ha through TSP. MP . gypsum and ZnO. respectively. Results revealed that the yield and yield contributing characters of wheat showed positive response with an increase in nitrogen levels up to 160 kg N hi'. The highest grain yield (3.32 t hi') was obtained from 160 kg N hi'. whereas the lowest (1.5 It hi5 from 0 kg N hi'. The variety Shatabdi produced the highest grain yield (3.63 t hi') and Protiva produced the lowest grain yield (3.12 t hi'). The interaction between variety and nitrogen levels significantly influenced almost all the growth and yield attributes showing the highest grain yield (3.48 hi') from the variety Shatabdi with 160 kg N hi'. The lowest grain yield (2.32 it hi') was obtained from the variety Shatabdi with 0kg N hi'.