Effect of different levels of nitrogen and phosphorous on some physiological and ‎morphological traits of golden rod (Solidago canadensis L.)‎

To evaluate the effect of different levels of nitrogen and phosphorous on some physiological and morphological traits of golden rod (Solidago canadensis L.) a split plot experiment carried out based on randomized complete block design with three replications in Research Farm of Shahrekord University. Nitrogen fertilizer at four levels of (0, 50, 100 and 150 kg/ha) as main factor and phosphorous fertilizer at three levels (0, 50 and 100 kg/ha) were used as subsidiary factor. Results showed that different levels of nitrogen, phosphorous and their interactions had a significant effect on growth indices such as shoot fresh and dry matter, leaf area and flower flavonoid content. Also, nitrogen and phosphorous application showed a significant effect on flowering time and flowering duration. Increasing in nitrogen and phosphorous levels, caused early flowering and increased flowering period in treatments as the best results observed in 150 kg/ha accompanied with 100 kg/ha of nitrogen. Generally, in order to obtain the maximum growth indices in same conditions, application of nitrogen in 150 kg/ha with phosphorous in 100 kg/ha can be suggested for golden rod cultivation as an ornamental and medicinal plant.