The lON-13.1P-16.6K fertilizer caused a lower medium pH than the others.
Medium fertigated with the lON-13.1P-16.6K or 15N-8.7P-20.8K fertilizer always had higher EC
than that receiving the 20N-8.7P-16.6K fertilizer. In a second experiment, the same fertilizers at
the 200 mg N 1-l concentration were used,on mature plants in late August, with either municipal
water (EC = 1.4 dS m-l> or water from a reverse osmosis system (RO, EC = 0.03 dS m-‘1.
Regardless of which fertilizer was used, flowering date, flower size and number, as well as plant
width were unaffected. The lON-13.1P-16.6K fertilizer resulted in 12% more leaves than
20N-8.7P-16.6K by May the following year. Plants fertigated with RO water had slightly larger
flowers and longer leaves