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摘要
This research was carried out to study the effect of nitrogen rate application (0, 120, 240 and 360 kg Nitrogen ha(-1)) and nitrogen timing on grain yield, yield components, grain quality and protein banding pattern in different growth stages of Shiraz cultivar which was grown at research station of the School of Agriculture, Shiraz University at Bajgah in the 2008/2009. Results indicate that the highest value for grain yield was obtained at 240 kg N ha(-1) when it was applied through vegetative growth stages (8230 kg ha(-1)). Yield components were significantly increased with enhancing the level of nitrogen with no significant difference between 240 and 360 kg N ha(-1). Results show that no N application at tillering stage decreased spikes number/m(2) and seeds spike(-1), and the minimum value of 1000 grain weight was observed when we remove N application in grain filling period. Leaf protein did not influenced by N treatments. However, the sharpness of a band with molecular weigh about 51 kDa, related to Rubisco enzyme, was increased in some treatments. Furthermore, 240 kg N ha(-1) application in all timing treatments resulted in maximum seed protein content (5.5 mg protein g(-1) grain). At the same time, seed water soluble proteins, Albumin and Globulin, showed no polymorphism. While different N rate treatments had no significant effect on seed gluten content, no N application in grain filling period declined it significantly. All in all, obtaining high wheat grain yield beside a suitable bakery quality are possible in a proper farming management system without environmental impact of N over application. These goals may be achieved with sufficient N application during vegetative growth for yield and late season N application for protein quality.
- 出版日期2011-3
