effect of different levels chemical fertilizers and biological nitrogen on yield and photosynthetic pigments of saffron (crocus sativus l.) in different density corm

the saffron understanding the factors that increased the quality and quantity of product in order to achieve optimum performance it is important, in this regard, the use of fertilizers and different densities corm are the most important factor. in this regard, an experiment in 1394 to factorial design in a randomized complete block design with three replications in the village davoodabad located in the city gharchak to study the effect corm density and chemical fertilizers urea and fertilizer nitroxin on yield and photosynthetic pigments of saffron was done. the experiment consisted of three levels of corm density (60, 120 and 180 corm/m2) as the main factor and fertilizer sources at four levels (control (without fertilizer), chemical fertilizer urea 150 kg/ha, fertilizer nitroxin 5 l/ha and the combined chemical fertilizer 75 kg/ha and fertilizer nitroxin the amount of 2.5 l/ha) were considered as sub factors. the results showed that effect of different treatments density on all traits at percent was significant. planting saffron high corm density (180 corm/m2) positive effect and increasing on all traits accept the leaf length and photosynthetic pigments. also saffron highest yield of 2.60 kg/ha at density of 180 corm/m2 was obtained. effect of different fertilizer sources were also significant traits, so that the use of fertilizer nitroxin increased vegetative growth and yield of saffron compared to other treatments and cause a 30% yield stigma improvement compared to the control treatment were. should be noted that the effect of urea chemical fertilizer alone and in combination with fertilizer nitroxin the traits saffron test showed no significant difference, so fertilizer nitroxin can also reduce the use of urea chemical fertilizer a suitable replacement for it.