The subsoil, normally used for passion fruit cuttings production, presents low potassium concentration and, thus, great probability of response to the application of this nutrient. Thus, it was evaluated the application of potassium to the substratum of production, to follow the effects in the development, the production of dry matter and the nutricional status of the plants. The experimental design used was randomized blocks with 5 treatments and 4 replications. The doses of potassium were: 0; 75; 150; 225 and 300 mg of K dm-3. All the plants received constant doses of N, P, B and Zn of 300; 450; 0.5 and 5 mg dm-3 respectively. The experiment was lead in pot with 2 dm³ of substratum of a Red Latosol (Oxisol), during 60 days. The potassium application affected the quadratic form of the growth and the nutrition of the passion fruit. The biggest production of dry matter of the plants was associated with the dose near to 200-220 mg of K dm-3, and 3 mmol c of K dm-3 in the soil.
Passiflora edulis; nutrition; fertilization
