Research Article 
Phenology and Physiology of Canola as Affected by Nitrogen and Sulfur Fertilization
Gulzar Ahmad, Amanullah Jan, Inamullah . and Muhammad Arif
Journal of Agronomy, 2006, 5(4), 555-562.
Abstract
Experiments were conducted at Cereal Crops Research Institute Pirsabak Nowshera, Pakistan, during 2003-04 and 2004-05 to evaluate the impact of nitrogen (N) and sulfur (S) levels, time and methods of application on Canola (Brassica napus L. cv. Bulbul-98) under irrigated conditions. Four levels of S (0, 20, 40 and 60 kg S ha-1) and three levels of N (80, 120 and 160 kg N ha-1) and a control treatment with both nutrients at zero level were applied as a sole dose at sowing, or in two split applications (50% at sowing + 50% at leaf rosette stage), or three split applications (1/3rd at sowing + 1/3rd at leaf rosette stage+ 1/3rd at flowering). The experiments were laid out in Randomized Complete Block (RCB) Design with split plot arrangement having four replications. Treatments comprising N and S levels were applied to main plots while time of application treatments were assigned to sub plots. Analysis of the data collected from the experiments indicated that maturity of canola was delayed as N rate was increased. Increasing levels of N had progressively enhanced plant height, leaf area index and CGR up to the highest level of 160 kg N ha-1. However, harvest index, was increased up to 120 kg N ha-1. The influence of S was non-significant on days to maturity while leaf area index and harvest index, were increased significantly when S rate was increased up to the 40 kg S ha-1. However increasing rate of S continuously enhanced plant height and CGR up to the highest level of 60 kg S ha-1. There was no significant influence of the time of application of N and S on plant height, leaf area index and CGR. However, sole application of N and S at sowing resulted in early maturity and three-split applications significantly decreased harvest index of canola.
ASCI-ID: 31-297
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