Abstract: The female flowers in the female syconia( Ficus pumila L. , Moraceae) blossom and bear fruit once a year, while the male flowers in the gall syconia ( F. pumila L.) do so twice a year. The first and the second generations of female fig wasps ( Wiebesia pumilae (Hill) Wieb., Agaonidae) start flying out of the gall flowers in the gall syconia at the time when the male flowers are in bloom. Such synchronism ensures that the female flowers can be pollinated and bear fruit, and provides good conditions for the wasps to complete the life cycle.

Key words: long term fertilization, upland yellow soil, maize, fertilizer utilization rate.