Influence of sulphur, potassium humate and their interactions on growth, flowering and chemical constituents of roselle plant (hibiscus sabdariffa)‎

الملخص EN

This study was achieved during the two successive summer seasons of 2017 and 2018 at the experimental farm of faculty of agriculture, Fayoum university, Fayoum.

the main target of this study was to examin the influence of four rates (0, 50, 100 and 150 kg fed-1) of sulphur and potassium humate (0, 10, 20 and 30 kg fed-1) as soil application and their interactions on vegetative growth, flowering and chemical compositions of roselle (hibiscus sabdariffa) plant.

the obtained results referred that using sulphur at the highest rate (150 kg fed-1) significantly increased growth parameters (plant height and number of branches / plant), some flowering and fruits characters (number of fruits plant-1 and fresh and dry weight of sepals plant-1) and chemical constituents (N, P and k% , chlorophyll a + b, charbohydrate % , anthocyanins % and sepals acidity) compared with control.

plants treated with potassium resulted in the highest significant values of all the above mentioned studied parameters.

also, the interaction effect between sulphur and potassium shown, that the highest values of vegetative growth and flowering parameters as well as and chemical composition were resulted from 100 or 150 kg fed-1 sulphur combined with 30 kg fed-1 potassium humate compared with control treatment