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１９９０～１９９２年对密阳４６、珍汕９７Ａ等６个主要制种亲本的生育特性和开花习性进行了观察、研 究，掌握了亲本在早夏制的变化规律及相关技术。
From 1990 to 1992, the fertility characteristics and flowering habits of 6 main seed-producing parents such as Mizhou 46 and Zhenshan 97A were observed and studied, and the variation rules and related techniques of their parents in early summer were obtained.