Effect of chemical and organic fertilizer on tomato (Lycopersicum esculentum M.) competition with Datura (Datura stramonium L.)

A field experiment was conducted in order to investigate the effect of organic (vermicompost and ecosystemic) and chemical (urea) fertilizers on tomato growth under of datura competition, in the University of Mohaghegh Ardabili in the year 2016-2017. factores were three density levels of Datura (0, 1 and 2 plants per pot) and fertilizer type at five levels (control, urea, vermicompost, solid acidium, and acidic solution). The experiment was conducted in a completely randomized block design with 3 replications. In the unfertilized treatment (control), the datura competition with tomato reduced the number of stems per plant from 2.5 to 1 stem per plant. datura competition with tomatoes reduced the number of leaves per plant by 25 to 46.5 percent. Application of fertilizer, especially urea, increased the number of leaves per plant of tomatoes. This increase was higher under weed competition. Urea application increased the root volume and root dry weight of tomato in comparison with control by more than 1.5 and 2.5 times, respectively. The effect of datura density on root fresh weight was significant only at 5% probability level. Resualts showed that the presence of two datura reduced root fresh weight of tomato from 21.4g to 13.4g. The application of urea fertilizer increased the fruit weight (yield) from 135.3 g per plant in the control treatment to 394.44 g per plant and the number of fruits from 3.67 fruit per plant in the control treatment to 92.9 fruit per plant. Weed competition reduced the number of tomato fruits from 6.75 to 4.65 fruit per plant, and it,s yield from 256.262 g to 182.6 g per plant. The application of urea fertilizer increased the above and underground dry weight of datura The application of fertilizers, especially urea and solid humic acid, increased the number of capsules per dormancy.