The subject invention is based on unexpected more than additive effect of multiple applications of at least one cyclopropene on crop yield as compared to single applications. Provided are methods of increasing yield of a plant comprising contacting the plant with multiple applications of a cyclopropene. In one aspect, the method comprises (a) contacting the plant with a first composition comprising a cyclopropene； and (b) contacting the plant with a second composition comprising a cyclopropene； thereby increasing the yield of the plant in comparison to a plant not contacted with the first composition and/or the second composition. In another aspect, the method comprises contacting the plant with two or more separate applications of a composition comprising at least one cyclopropene thereby increasing the yield of the plant in comparison to a plant not treated or contacted with two or more separate applications of a composition comprising at least one cyclopropene.本發明是基於多次施用至少一種環丙烯，與一次施用相較，在作物收量方面帶來意外的較加乘效果更高的增產效果。本發明提供一種增加植物收量的方法，該方法是多次施用環丙烯並使其與植物接觸。一方面，該方法包含(a)使植物與包含環丙烯之第一種組成物接觸；(b)使植物與包含環丙烯之第二種組成物接觸；而使植物收量比未與第一種組成物及/或第二種組成物接觸者更增加收量。另一方面，該方法是由二次或更多次分開施用包含至少一種含有環丙烯的組成物並使其與植物接觸，而使植物收量比未經處理或未與二次或更多次施用至少包含一種環丙烯之組成物接觸的植物增加。
