Abstract
In order to optimize the nitrogen rates in three wheat (Triticum aestivum L.) cultivars for obtaining higher grain yield, a split
plot experiment based on Randomized Complete Block Design with three replicates was conducted in the research field of
University of Agriculture, Faisalabad during Rabi season 2006-07. Among treatments nitrogen levels (N0= 0, N1= 50, N2=
100, N3= 150 kg ha-1
) in main while wheat cultivars (V1= Punjnad-I, V2= Fareed-2006, V3=Uqab-2000) were allocated in sub
plots during the course of growing season. Traits as plant height, fertile tillers, spike length, spikelets spike-1
, grains spike-1
,
1000-grain weight, straw yield, grain yield and harvest index (HI) were significantly (P=0.05) affected by treatment
combinations. Maximum grain yield was obtained by V3 (Uqab-2000) cultivar when treated with N3 (150 kg ha-1
) fertilizer
level. Also, results showed that with increasing nitrogen rates, wheat yield increases significantly up to a level of
significance (P=0.05). Increasing nitrogen levels led to significantly increase in plant height (101.81cm), spike bearing tillers
(495.77), grains spike-1
(61.45), straw yield (8.60 t ha-1
) and harvest index (36.17%) of V3 (Uqab-2000). In all traits except
germination count, V3 (Uqab-2000) was found to be superior.
