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The grain yield is the result of a complex interaction of many factors, which can be more or less influenced by environmental conditions. Number of grain per spike, weight of grain per spike and thousand kernel weight are the main components of the yield. The reaction of these components to variations of climatic conditions or other inputs can be different, according to genotypes. In our research the climatic conditions have determined a large variation of this components, especially caused by favorable and unfavorable conditions. The greatest contribution on grain yield was manifested by weight of grain per spike (correlation coefficient 0.62 in 2012, and 0.70 in 2013 at basic fertilization; 0,76 in the second experimental year and 0.62 in third year at additional fertilization), followed by number of grain per spike (correlation coefficient: 0.45 in 2012 and 0.53 in 2013 at basic fertilization, and 0,49 in second experimental year at additional fertilization).Â

The Contribution of Yield Components to the Achievement of Production in some Winter Wheat Genotypes