Excessive use of chemical fertilizers in agriculture causes degradation of soil and vegetation health. The consistent use of such agrochemical products shows harmful impacts on the environment. Therefore, urgent needs an eco-friendly substance which replace the chemical fertilizers. Thus, in the present study, the main objective was to evaluate the effect of fly ash to improve the growth and the management of root-knot nematode (Meloidogyne incognita) of carrot (Daucus carota L.). A greenhouse experiment was conducted to observe the effect of different levels of fly ash concentrations (10%, 20%, 30%, 40% and 50% w/w) with normal agriculture soil on plant growth, photosynthetic pigments and against to disease intensity of nematode. Plant growth parameters and photosynthetic pigments were increased significantly from 10% to 30% fly ash levels as compared to control (0% fly ash). Maximum growth and photosynthetic pigments were found at 30% level of fly ash. But at higher levels of fly ash (40% and 50%), plant growth was reduced significantly. However, in the experiment of nematode management the number of galls, egg masses and eggs/egg mass gradually suppressed as the levels of fly ash increased from 10% to 50% and promote the growth of plant at 30% concentration of fly ash as compared to untreated inoculated control (0% fly ash with nematode).