Effect of Bio-fertilizers in Combination with Different Rates of Chemical Fertilizers on the Growth Characters and Sepals Yield of Roselle (Hibiscus sabdariffa L.)

Roselle or Maki tea (Hibiscus sabdariffa L.) is a subtropical medicinal and aromatic plant belongs to the family Malvaceae that sepals of it's due to its medicinal properties and culinary uses. To evaluate the effect of bio-fertilizers in combination with different rates of chemical fertilizers on the growth characters, sepals yield and yield components of roselle, an experiment was conducted in randomized coplete block design with three replications, at the Research Station in Zabol University, during 2012 and 2013. Experimental treatments were plant nutrition with NPK, biophosphate, biophosphate% NPK, biophosphate% NPK, biophosphate 100% NPK, nitroxin, nitroxin%NPK, nitroxin%NPK, nitroxin흍%NPK, nitroxin渪⦆謩薫, nitroxin biophosphate% NPK, nitroxin渪⦆謩薫廻% NPK, nitroxin渪⦆謩薫廻崴% NPK and control (non-use of any fertilizer). Plant traits such as plant height, no. of branches.plant-1, fresh and dry weight of vegetative, roots fresh and dry weight, calyx no.plant-1, sepal dry weight, sepals yield of roselle were measured. The results of combined analysis of variance showed that the effect of fertilizer were significant (P≤0.01) for all studied traits. Calyx no.plant-1 was the most important component in determining the sepals yield. The highest of all studied triates belong to nitroxin渪⦆謩薫廻崴% NPK treatment that its difference with nitroxin biophosphate% NPK treatment was not significant. Thus, with respect to the production of medicinal plants in cropping systems and attention to the cultivation of these plants in low input systems, to improve plant growth and increase the sepals yield of roselle, 50% of the recommended dose of fertilizers with bio-fertilizers is recommended.