This research was studied during 2000 -2001 in one of the greenhouses of Khaadem nursery, Varaamin, Iran. In this research the effect of irrigation water acidifying on the quality and quantity of racemose carnation cutflower Var. "ARANKA" was studied and treatments included to acidity levels of irrigation water (A1: normal with pH = 7.6, A2: acidic water with pH=6+0.1). At the end of the experiment, results showed that irrigation water acidification increased number of stems per plant and square meter, number of closed buds and total number of buds on stem and post harvest vase life, Potassium, Calcium, Magnesium, Boron, Iron and decreasing on Nitrogen leaf content, significantly. But, the effect on the length and thickness of stem, number of opened buds on stem, stem flexibility, and Phosphorous leaf content weren't significant.
