Non-grafted and grafted melon plants of cultivar Khatooni were evaluated for yields and fruit quality under three nitrogen (N) rates (75, 150 and 225 kg.ha-1) in open field conditions.The hybrid Ferro RZ (Cucurbita.maxima×C, moschata) was used as rootstock.Increasing N fertilization rate from 75 to 150 kg.ha-1 increased marketable yield by 27％, whereas increasing N rate from 150 to 225 kg.ha-1 decreased melon production by 11％.Marketable yield was higher by 19％ in grafted than in ungrafled plants.Increasing N fertilization rates from 75 to 150 kg.ha-1 increased above-ground dry biomass with the highest value recorded with 150 kg.ha-1 ofN.N and TSS contents increased in response to an increase in N fertilization with the highest values recorded on plants receiving 150 kg.ha-1.In contrast DM, TSS contents in fruits harvested from ungrafted plants were significantly higher by 8.8％ than grafted plants.