Russian Journal of Biological Research

76-80

Authors: Sevda Z. Ahmedova

Since the 1990s years, after the Republic gained its independence, the natural resources and environment of Azerbaijan has been in hard condition. For eliminating the ecological tensity of the Republic, several plans and projects were put up and carried out. At last the positive results were obtained.

93-99

Authors: Marzieh Negahban, Abdolhossein Aboutalebi, Abdolraool Zakerin

Field trials were carried out in Sadra town near Shiraz, Iran in 2010 to determine the effect of phosphorus (P) on the productivity of Mexican Marigold (Tagetes minuta L.), an important medicinal plant. Phosphorus was band-placed at the rates of 0, 40, 80 and 120 Kg/ha at planting time. Results indicated that growth parameters and essential oil concentration increased with increasing the P levels. Application of 120 kg/ha P significantly increased the fresh and dry weights, plant height and flower numbers per plant. All P as compared with the control significantly enhanced the essential oil concentration. Moreover the role of phosphorus as a central and pivotal metabolic and regulatory nutrient element has been discussed.