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Mentha arvensis is an annual herbaceous plant that produces cornmint oil used for pharmaceutical and food industries. As a source of menthol and dimentolized oil, M . arvensis has a profitable opportunity to be cultivated in Indonesian agroclimate . The research was conducted to obtain the optimal dosages of N, P and K fertilizers, for increasing the yield and oil quality of M . arvensis , planted in Cicurug Research garden ( latosol soil, 5 5 0 m asl .) , by using randomized block design, with two factors, arranged factorially, with 3 replications. First factor was M. arvensis promising number (Mear 00 10 an d Mear 00 12 ), an d fsecond factor was NPK fertilizer, included : a). control, b). 69 kg N + 54 kg P 2 O 5 + 94,5 kg K 2 O, c). 69 kg N + 72 kg P 2 O 5 + 94,5 kg K 2 O, d). 69 kg N + 90 kg P 2 O 5 + 94,5 kg K 2 O, e). 92 kg N + 90 kg P 2 O 5 + 126 kg K 2 O, f). 92 kg N + 72 kg P 2 O 5 + 126 kg K 2 O, and g). 138 kg N + 90 kg P 2 O 5 + 126 kg K 2 O per ha . Variables observed were plant height, number of leaf and branch, biomass weight, oil content, free menthol content, and total menthol content. The results showed that application of 92 kg N + 72 kg P 2 O 5 + 126 kg K 2 O/ha equivalent to 200 kg Urea+ 200 kg SP-36 + 200 kg KCl/ha to M. arvensis, resulted better herb biomass , oil content , total menthol content and oil yield at first harvest compared with other fertilizer treatments. At first harvest, oil and menthol yield were 41 and 25 kg / ha. The uptake of N, P, K nutrients were N > K > P, respectively.