Study on The Distribution of Maize Tassel Pollen and The Effective Pollinating Range

The research showed that the output of pollen of single male tassel of the maize variety Dongnong 250 was 1.152×107grainms or 6.035 g weight, the equation of density per unit area of pollen should be an ellipse parabola surface, the area scattered by pollens in theory was 68.139 8 cm2; The area in which the female tassel could be pollinated with 100% was such a circular of 0.7 m radius, and the pollen density was 26 grain/cm2 in this limits. Besides, the area in which the female tassel could be pollinated with 90% ~ 99% was the circular of 0.7～1.7 m radius, and the pollen density was 23~26 grain/cm2 in this limits. These indicated that the pollen supplying was much more than the pollination need in cultivated colony, so the pollen was certainly a “stock” which scramble for photosynthesis produce with female tassel. So the 1/15~1/25 ratio of reserved male tassel could meet the need of pollination.