The effect of mineral fertilizer on the potentiality towards enhancing the nutritional quality of Hibiscus sabdariffa's calyx was investigated. November, 2014 during the rainy season, at Research Farm of Kano University of Science and Technology, Wudil, Kano State. The results obtained indicated that, mineral fertilizer 100kg/ha had the higher compositions of essential elements (Na, K, Mg, Ca,), trace elements (Mn, Fe, Zn and Cu) and the proximate constituents (moisture, ash, crude protein and lipid), and then reduced the anti nutrient content (tannin) drastically, where the F100 fertilizer recorded the l content among other fertilizers (M 5.230> F75 4.443 > F100 4.190g/100g respectively). However, mineral fertilizer at a rate of 75kg/ha recorded highest in crude fiber, carbohydrate and calorific value (11.157%, 61.725%, and 321.023kcal r was more proficient in influencing the calyx nutritional quality. It was however proven that, mineral fertilizer (N.P.K 15-15-15) at a rate of 100kg/ha was appropriate for the qualitative dietary calyx production.

Field experiment was conducted at Research Farm of Kano University of Science and Technology, Wudil, to determine the effects of organic fertilizer on the nutritional status of Hibiscus sabdariffa (Roselle). The results obtained indicated the manure fertilizer to be higher in protein (20.910%) and crude fiber contents (12.047%), Zn (30.689mg/kg) and Cu (18.571mg/kg) concentrations, no Pb was detected at all. However, the difference that exists amongst the fertilizers (T2 and T3) and poultry manure (T1) was found to be insignificant in so many parameters. Therefore, the study work with regard to the findings revealed that organic fertilizer (poultry manure) had the potential over the inorganic fertilizers for the dietary nutrients yielding in vegetables Hibiscus sabdariffa. However, the information will economically favor our local farmers and users to adapt the cheapest poultry manure for the optimum yield of qualitative produce vegetable as prospective against malnutrition in Nigeria especially North East where endemically affected by war.Keywords: Roselle leaves, vegetative stage, proximate analysis, elements, Kano