12. Content of protein and wet and dry gluten in the grain of Triticum Durum Wheat (Triticum Durum Desf.) varieties depending on nitrogen fertilization

A field experiment was carried out on the experimental fieid of Cotton and Durum Wheat Research Institute, Chirpan, during the period 2004-2007 the following varieties were studied: Progres, Neptun 2, Beloslava, Saturn 1 and Vozhod under four norms of nitrogen fertilization – N₀, N₆, N₁₂, N₁₈ kg/da.
The results indicate that application of high nitrogen norms of fertilization has positive influence over the protein content in grain. Vozhod variety can be determined as the variety with higher protein content (N₁₈ – 18.23%). On average, for the period of carrying out the research Vozhod variety can be ranked first with regard to wet and dry content in the grain yield.