Study the effect of irrigation water regime and fertilizers on growth, yield and some fruit quality of Hibiscus sabdariffa L.

Management of water is a great challenge for the coming decades; also studding of organic and inorganic fertilizers application is very important because of their effect on environment as well as plant growth and yield. This study was conducted in split plot design with three replications during 2012 and 2013 at the Experimental Farm of El-Quassassin Horticultural Research Station, Ismailia Governorate, Agriculture Research Center, Egypt. Treatments included three irrigation rats Q1 (1152 m3/fed), Q2 (1728 m3/fed) and Q3 (2304 m3/fed) as main plot and two kinds of fertilizers (organic and inorganic fertilizers): F1 (100% NPK), F2 (50% NPK), F3 (100%NPK+Humic acid), F4 (50% NPK+Humic acid) and F5 (Humic acid) as sub plot. Results showed that increasing water stress reduced growth, yield and fruit quality of Roselle plants. Dual application of both organic and inorganic fertilizers caused significant increases in the previously mentioned characters compared with the individual treatment in both seasons. Moreover, the maximum growth, yield and fruit quality was produced under the effect of interaction between Q3 X F3 treatment in both seasons compared with the other treatments and with significant differences. On the other hand, the anthocyanin% revealed reversed trend, where the maximum significant means obtained under (Q1XF3) treatment.