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  • 1 Agricultural Institute Juzno predgradje 17 HR-31000 Osijek Croatia
  • | 2 University J. J. Strossmayer in Osijek Faculty of Agriculture Trg Sv. Trojstva 3 HR-31000 Osijek Croatia
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The effect of the N, P and K fertilisation on yield and quality parameters of cultivar Žitarka during two growing seasons (2002/03 and 2003/04) was studied. Fertilization increased yield, although only treatment with 200 kg N ha −1 yielded significantly higher than treatments with 80 kg N ha −1 . Protein content increased significantly (P<0.001) with the application of 80 kg N ha −1 , 120 kg N ha −1 and 160 kg N ha −1 . The highest N applications with 200 kg N ha −1 and 240 kg N ha −1 increased protein content on the same level as with 160 kg N ha −1 . Wet gluten and sedimentation value were also significantly (P<0.001) affected by N fertilizer treatments. Although increment of N fertilization increased values of these quality parameters, 120 kg N ha −1 , 160 kg N ha −1 and 200 kg N ha −1 treatments showed similar effect, while treatment with 240 kg N ha −1 resulted with significantly higher values. Gluten index increased only with applying 80 kg N ha −1 while the highest N levels (200 kg N ha −1 and 240 kg N ha −1 ) showed dramatically gluten weakening. Considering grain hardness only treatment with 80 kg N ha −1 had significant (P<0.001) influence. Simultaneously, P and K did not affect grain yield and quality, neither comparing PK to controle, or N 2 P 1 K 1 to N 2 P 2 K 2 .

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