Effect of bio-fertilizer on quantitative traits of roselle (Hibiscus sabdariffa L.) under different levels of chemical fertilizer

Roselle (Hibiscus sabdariffa L.) is a subtropical medicinal plant belongs to the Malvaceae family, those sepals of them, due to its therapeutic properties and culinary, are used. To evaluate the effect of bio-fertilizer on quantitative traits of roselle under different levels of chemical fertilizer, an experiment was conducted at the Research Farm, University of Zabol, during growing season 2013 and 2014. The experiment was carried out in the split plot based on randomized coplete block design with three replications. The main plot was the use of chemical fertilizers, phosphorus, nitrogen and NPK and the subplots were inoculated with nitroxin, supernitroplus, superbiosulphate, mycorrhiza and non-bio-fertilizer. The effects of chemical, biological fertilizers and interactions of thems were significant (P≤0.01) for all studied traits. Calyx number per plant was the most important component in determining the sepals yield. The highest values for all studied triates belonged to the treatment NPK fertilizer in combination with the nitroxin bio-fertilizer. Thus, with respect to the production of medicinal plants in cropping systems, to improve plant growth and increase the sepals yield of roselle, chemical fertilizers NPK in combination with the nitroxin bio-fertilizer is recommended