Abstract: The crop output has been successfully forecasted for more than ten years on the basis of pollen flux abroad. The annual crop output depends upon meteorological elements (temperature, wind velocity, precipitation, etc. ). These elements have influence on the pollination intensity (airborne pollen density, number of pollen grains' m- 3 air), which reflects directly the crop output. During 1992 to 1994, the authors had collected and measured the airborne pollen with Cour' s sampler, and recorded the major meteorological data. From statistical analysis, the authors have obtained data on the relationship between the outputs of wheat and maize and their pollen deusity during the maximum pollination period. Thus formulating a prehminary model for crop-output prevision of wheat and maize has been attempted.

Key words: Pollen flux, Wheat, Maize, Crop-output prevision