Effect of gamma irradiation and sulphur fertilizer on growth and chemical composition of hibiscus sabdariffa L

Field experiments were carried out during two successive seasons to investigate the effect of gamma irradiation and sulphur fertilization on growth and chemical composition of Hibiscus sabdariffa L. The results showed that sulphur application stimulated plant height, branches number as well as yield components. The maximum values of these characters were obtained as a result of 250 kg S/fed. On the other hand, sulphur treatments increased fixed oil content, anthocyanin content and flavones yield. Concerning the effect of irradiation treatments, it could be concluded that these treatments increased both plant height and branches number. Also, exposed seeds to 1 krad enhanced fruits fresh weight. Generally, most of irradiation treatments increased chemical constituents content of sepals, except pH and TSS%, which had no clear trend. Interaction treatments between irradiation and sulphur application gave in most cases a pronounced effect on vegetative growth and chemical constituents of roselle plants

effect of gamma radiation and manganese application on growth and chemical constituents of datura metel L

The present work was conducted during two successive seasons to study the combined effect of irradiation with Mn on the growth and chemical components of Datura metel. Manganese treatment had no pronounced effect on growth characters, photosynthetic pigments and most of the nutrient elements. On the other hand, Mn treatment at 50 ppm increased alkaloid content and yield in the leaves. Irradiation treatments, especially the lower doses, had stimulatory effect on plant height and leaves number/plant. Medium doses of gamma irradiation combined with manganese treatment improved the accumulation of total alkaloid content, photosynthetic pigments, and some nutrients content, such as nitrogen, phosphorus, iron and copper