Abstract: In the period of 1998～2000, 10 wheat varieties were used to study the effects of growth, development process and climatic conditions on the quality of wheat grains through spring sowing experiments in Beijing. The results showed that there were no significant variations on the quality traits among the varieties while there were significant variations among different years. The most significant negative correlation had been shown between the days from sowing to ripening and hardness of the grains and between the days from heading to ripening and the content of wet gluten of the grains. There was a significant negative correlation between day night temperature difference during the period from heading to ripening and content of NIR protein. The results also showed that there was most significant negative correlation between total radiation, day night temperature difference and the content of wet gluten of the grains. There was significant positive correlation between total sunlight and the content of wet gluten of the grains. The significant negative correlation was present between sedimentation value and total radiation, total sunlight, average temperature of daytime, day night temperature difference.

Key words: Spring-sown wheat, Grain quality, Growing period, Climatic conditions