Abstract
To increase the protein content of wheat grain, we applied fertilizer 10 days after heading and examined its effect on agronomic character and flour quality. This top dressing did not affect the agronomic characters except for delaying the mature stage, but increased the 1000-grain weight and test weight. Protein content increased linearly as the amount of applied fertilizer increased, at a rate of about 0.5% per 1gm-2 nitrogen top dressing. Gluten content increased as the protein content increased, irrespective of cultivars, breeding lines and years. There was a significant correlation between protein content and flour color; as the protein content increased flour color became gray. Nitrogen fertilizing 10 days after heading effectively increased the protein content in wheat.
