title: Influence of nitrogen and sulfur fertilization on quality of canola (Brassica napus L.) under rainfed conditions.
abstract: Field experiments were conducted at Cereal Crops Research Institute, Pirsabak, Nowshera, Pakistan, during winter 2003-2004 and 2004-2005 to evaluate the effect of nitrogen and sulfur levels and methods of nitrogen application on canola (Brassica napus L. cv. Bulbul-98) under rainfed conditions. Four levels of S (0, 10, 20, and 30 kg/ha) and three levels of N (40, 60, and 80 kg/ha) and a control treatment with both nutrients at zero level were included in the experiments. Sulfur levels were applied at sowing while N levels were applied by three methods (100% soil application, 90% soil+10% foliar application, and 80% soil +20% foliar application). The experiments were laid out in randomized complete block (RCB) design having four replications. Oil content increased significantly up to 20 kg S/ha but further increase in S level did not enhance oil content. Glucosinolate content increased from 13.6 to 24.6 micromol/g as S rate was increased from 0 to 30 kg/ha. Protein content increased from 22.4% to 23.2% as S rate was increased from 0 to 20 kg/ha. Oil content responded negatively to the increasing N levels. The highest N level resulted in the highest values for protein (23.5%) and glucosinolate (19.9 micromol/g) contents. Methods of N application had no significant impact on any parameters under study.
authors.affiliation: Cereal Crops Research Institute, Pirsabak, North West Frontier Province 25000, Pakistan.
authors.forename: G
authors.initials: G
authors.lastname: Ahmad
authors.forename: A
authors.initials: A
authors.lastname: Jan
authors.forename: M
authors.initials: M
authors.lastname: Arif
authors.forename: M T
authors.initials: MT
authors.lastname: Jan
authors.forename: R A
authors.initials: RA
authors.lastname: Khattak
mesh_terms: D029688:Brassica napus / Q000145:classification / Q000187:drug effects* / Q000502:physiology*; D005308:Fertilizers; D009584:Nitrogen / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D013455:Sulfur / Q000008:administration & dosage* / Q000493:pharmacokinetics*
chemical_list: D005308:Fertilizers; D013455:Sulfur; D009584:Nitrogen