engleski

The influence of mineral fertilization on winter wheat yield and quality

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 N2P1K1 to N2P2K2.

wheat ; N ; P and K fertilization ; grain yield ; quality

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