To evaluate the effect of the plant density and humicacid applicationon some of phytochemical characteristics of the Mallow (Malva sylvestris L.), the research was conducted as a factorial experiment on the basis of randomized complete block design with 9 treatments and three replications. All of the results were obtained at the Agricultural Research Station of Ferdowsi University of Mashhad during summer 2014 The treatments were density of plants (4, 6 and 9 plants per square meter) and humic acid concentration (0, 3 and 6 ml per liter). In this experiment the characteristics such as anthocyanins and the antioxidant capacity were analyzed and reported. The results indicate that, the plant density have a significant effect on antioxidant capacity of Malva sylvestris L. However, the humic acid concentration has a significant effect on all phytochemical properties of the plant. The interactions between these two factors were statistically significant on all measured traits. Based on the results, the maximum anthocyanin content (132.97 mg per liter) was obtained in the interaction between plant density (4 plants per square meter) and humic acid concentration (6 ml per liter). In addition, the highest antioxidant capacity (87.53 percent) was observed in the plant density (4 plants per square meter) and humic acid concentration (3 ml per liter). According to the results, it seems that the density of 4 plants per square meter and humic acid concentration equal to 3 ml per liter is the best treatment for Malva sylvestris L. production.

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