Synthetic nitrogen fertilizers can contribute to environmental hazards. Moreover, their manufacturing is an energy-intensive process which causes greenhouse gas emissions, lead climate change. Therefore, it should evaluate the possibility use organic sources such as Azolla a partial substitute for synthetic in cultivation, this may reduce cost of fertilizer inputs, and promote sustainable agric...

to study the effects of different fertilizing systems using green manure and zeoponix on grain yield and its components in sunflower, an experiment was conducted at the research farm of collage of agriculture, tarbiat modares university in 2010 and 2011. the experimental treatments were arranged as split plot design on the base of a complete randomized block design with three replications. two ...