title: Bread wheat varieties as influenced by different nitrogen levels.
abstract: Experiment was conducted to determine the effect of different nitrogen levels on four bread wheat varieties (Triticum aestivum L.) viz. Inqilab-91, Daman-98, Dera-98 and Punjab-96 at Gomal University, Dera Ismail Khan (NWFP), Pakistan during 2000 approximatey 2001. The experiment was laid out in split plot design having four replications using a net plot size of 2 m x 5 m. Nitrogen doses used were 0, 50, 100, 150 and 200 kg/ha. The results showed that different nitrogen levels had significant effects on plant height, total number of plants/m(2), number of grains/spike, number of spike/m(2), spike weight, biological yield, grain yield and grain protein content. Maximum plant height, total number of plants/m(2), number of spikes/m(2), spike weight, biological yield and grain protein content were observed at 200 kg N/ha. Among wheat varieties Daman-98 had maximum plant height, spike weight, grains/spike, 1000-grain weight, biological yield and grain yield. Inqilab-91 had heavier grains and the most grain protein content, while Dera-98 had the maximum plant population and spikes/m(2). Grain yield and biological yield were statistically similar at doses of 150 kg N/ha and 200 kg N/ha. However, dose of 200 kg N/ha, compared to dose of 150 Kg N/ha, significantly increased the protein content.
authors.affiliation: Department of Agronomy, Faculty of Agriculture, Gomal University, Dera Ismail Khan NWFP, Pakistan. aqdusdik@yahoo.com
authors.forename: Iqtidar
authors.initials: I
authors.lastname: Hussain
authors.forename: Muhammad Ayyaz
authors.initials: MA
authors.lastname: Khan
authors.forename: Ejaz Ahmad
authors.initials: EA
authors.lastname: Khan
mesh_terms: D000383:Agriculture / Q000379:methods; D001939:Bread; D004305:Dose-Response Relationship, Drug; D005308:Fertilizers; D005638:Fruit / Q000187:drug effects / Q000254:growth & development; D009584:Nitrogen / Q000008:administration & dosage*; D012639:Seeds / Q000187:drug effects* / Q000254:growth & development*; D013045:Species Specificity; D014908:Triticum / Q000187:drug effects* / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D009584:Nitrogen