The effects of this growth substance applied at vegetative period were summarized as follows: The emergence and growth of tillers are important characters of rice-plants at vegetative period.

• 为获得早熟增产的效果,须喷施适时、浓度适宜、增加基本苗。水稻营养生长期喷施赤霉素有抑制分蘖出生,促进主茎和早出生分蘖生长的效应。