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This paper deals with interrelationship between grain yield and some  physiological parameters of wheat plant nitrogen nutrition efficiency as well  as interrelationships between these parameters and some yield related traits  (biological yield, grain harvest index). The aim of such investigation is to  affirm possibilities of using physiological parameters of wheat plant  nitrogen nutrition efficiency as criterions in breeding on its grain yield.  The investigation, conducted as three years field trials, included 30 wheat  cultivars and perspective lines. There were studied: nitrogen content in the  above - ground part of plant at anthesis, in grain, in straw and total  nitrogen content at maturity, nitrogen harvest index, nitrogen reutilization,  post - anthesis nitrogen accumulation and physiological efficiency of  nitrogen. The positive and statistically high significant relationships  between nitrogen content in the above - ground part of plant at anthesis, in  grain and in straw, total nitrogen content at maturity, nitrogen  reutilization and post - anthesis accumulation as physiological parameters  and grain yield were registered in investigated material. Most of listed  parameters, important by grain yield aspect, can be studied easily and  measured before wheat vegetative period ends. The investigated parameters can  be recommended as criterions for selecting of parental pairs and evaluating  progeny in breeding of wheat on grain yield, considering to their determined  interrelationships and their measurability

Interrelationship between grain yield and physiological parameters of winter wheat nitrogen nutrition efficiency