Taiwan's agricultural produce once again took a sharp turn. This was easy to understand, because before Zheng Chenggong came, Taiwan only had a population of 100,000 people. Once Zheng arrived, he brought with him many immigrants. The army alone amounted to 70,000 people.
荷蘭人統治台灣三十八年，後來被鄭成功趕走，鄭氏放火將甘蔗田燒掉，改種蕃薯，台灣田間作物又再一次轉變，這也難怪，因為在鄭成功未來之前，台灣的人口，只有十萬人，鄭成功一來，又帶來許多移民，光是軍隊的人數就有七萬人。