六月底给温州蜜柑(Citrut unshiu Marc.)喷洒NAA(萘乙酸),果实生长率迅速提高,采收时较大的果实产量下降不明显。在丰产稳产的桔园,这一处理对果实大小产生的效应与果实生长早期使用NAA作为疏果剂的效果相似。本文对不同条件下NAA作为果实生长促进剂和疏果剂的相对优势进行了探讨。 NAA (naphthaleneacetic acid) was sprayed on Citrus unshiu Marc by the end of June, and the fruit growth rate increased rapidly. However, the yield of larger fruit during harvest was not significantly reduced. In an orange-and-orchard with high and stable yields, the effect of this treatment on fruit size is similar to the effect of early use of NAA as a fruit-thinning agent for fruit growth. In this paper, the relative advantages of NAA as fruit growth promoter and fruit-thinning agent under different conditions were discussed.