Abstract: In order to clarify the responses of different wheat plant dry matter translocation and grain filling characteristics to nitrogen application levels, to study the aboveground organs matter translocation at booting stage, flowering stage and mature stage and the grain filling properties, a field experiment was carried out in the field monitoring station of Agro-Environmental Protection Institute under different nitrogen treatments, 0（N0）, 180（N1）, 300（N2）kg/hm². The wheat cultivar, strong gluten wheat ‘Hengguan35’（HG35）and weak gluten wheat ‘Yangmai15’（YM15）were selected for the study. The results indicate that the increase of nitrogen input within a certain extent could promote the different parts of organs dry matter accumulation of two kinds of wheat, and the increase of nitrogen input was beneficial to dry matter accumulation and improve the transfer rate of wheat plant nutrient organs; dry matter accumulation of wheat grain is divided into slow growth stage, rapid growth period and stable period, and different wheat differ in different periods of grain filling rate, increasing nitrogen input within a certain extent was beneficial to improve the maximum grain filling rate and maintain the filling rate in telophase of grain filling. Comprehensive analysis, under the conditions of this study, the suitable nitrogen application rate of two kinds of special use wheat was 180 kg/hm².

Key words: strong gluten and weak gluten wheat, nitrogen supply level, dry matter accumulation, grain filling rate