Efecto de la fertilización química, orgánica y combinada sobre el rendimiento de la papa variedad Granola

in venezuela, the production of potato, solanum tuberosum l., normally requires the applications of great amount of mineral fertilizers (of), and organic amendments (oa) which represent an important part of the production costs of this crop. so it is necessary to develop strategies to decrease its use. we carried out an experiment in the town of pernia, vargas county in tachira state, to evaluate the response of potato (variety granola) to the application of 5 treatment of chemical fertilization (testwithout fertilizer; npk, npk+mg; npk+mg+b and npk+b) and 3 levels of organic fertilization (0, 5 and 10 t.ha-1 of chicken manure), with 3 repetitions for each combination. the experimental site is located at 1.900 masl, with a mean annual precipitation of 900 mm, and air temperature between 12 and 17 oc. the soil is classified as orthends. the results showed that the greatest yield was found with the application of npk+mg (38.39 t.ha-1), followed by the treatment of npk+b (35.90 t.ha-1) and 5 t.ha-1 of chicken manure (p≤0,01). the split of the organic and mineral fertilizer doses does not improve the yield of potato, when compared against the application of the whole dose of fertilizer at the sowing time. also, there were not significant differences in the potato yield when it was fertilized with five and 10 t of chicken manure (34.77 y 36.10 t.ha-1, respectively), however at the level of 0 t.ha-1 of chicken manure the yield is smaller 22.55 t.ha-1. when placing the chemical fertilizer and the organic amendment were splitted, yield not different from the whole dose application at the time of seedtime