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湖南省的籼型杂交水稻三系制种，呈现出季别性与地域性两大特征。亲本生物学特性在最佳生态条件下充分表现，是构成两大特征的主导因子。充分认识到生态条件与超高产制种的关系，可为杂交稻制种新体制的建立，提供理论与决策依据。
Three lines of indica hybrid rice in Hunan Province showed two characteristics of seasonality and regionality. The biological characteristics of parents are fully demonstrated under the best ecological conditions and constitute the dominant factor of the two major characteristics. The full understanding of the relationship between ecological conditions and super-high-yielding seed production may provide a theoretical and decision-making basis for the establishment of a new hybrid seed production system.