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Objetivou-se com o presente estudo, avaliar os efeitos da fertirrigação com doses de nitrogênio, fósforoe potássio no crescimento e na produção de massa seca de mudas de lima ácida ‘Tahiti’, enxertadas em ‘FlyingDragon’. O delineamento experimental utilizado foi em delineamento inteiramente casualizados em fatorial 33 + 1, e3 fatores (nitrogênio, fósforo e potássio - NPK), 3 doses (N1/2 =459; N1 =918;N2=1836; P1/2 =92; P1=184; P2=368;K1/2=438;K1=876; K2=1752 mg L-1) e um controle (sem adubação NPK), com 3 repetições, totalizando 84 unidadesexperimentais. Cada unidade experimental constou de uma muda cítrica cultivada em um sacola com 2,5 kg de substrato, onde eram realizadas três aplicações semanais de fertirrigação, com 200 mL de solução nutritiva por planta, durante o período experimental. Avaliaram-se a altura das plantas, o diâmetro do caule e matéria seca da planta (parte aérea e raiz) aos 215 dias após a enxertia. O emprego das doses de N1/2 P1/2 K1/2 proporcionaram adequado desenvolvimento e com maior produção de matéria seca aos 215 dias após a enxertia da lima ácida ‘Tahiti’enxertadas em ‘Flying Dragon’ cultivada em substrato.Objectives were evaluation effects of fertiligation with different concentration of nitrogen,phosphorus and potassium in seedlings of 'Tahiti' acid lime, grafted on 'Flying Dragon', by means of the results in theproduction of dry matter weight and the nutrients accumulation. The experimental design was completelyrandomized design in factorial 33 + 1, and 3 factors (nitrogen, phosphorus and potassium - NPK), 3 doses (N1/2 =459;N1 =918;N2=1836; P1/2=92; P1=184; P2=368; K1/2=438;K1=876; K2=1752 mg L-1) and a control, with 3replications, totaling 84 experimental units. Each experimental unit consisted of a citrus seedling in a bag with 2.5 kgof substrate, where they were performed were three weekly applications of fertigation, 200 mL of nutrient solutionper plant, during the experimental period. Evaluations of plant height, stem diameter a

In the production costs of in the diploid potato var. Criolla Colombia, fertilizer represents 17% of the total costs, and it’s inappropriate and sometimes excessive use translates into expensive investments with technical inefficiency. This is mainly due to a lack of nutrient absorption levels of the selected variety. The research was conducted in Granada (Colombia) with five fertilization treatments (absolute control, commercial control, technical recommendation + 50%, technical recommendation and technical recommendation - 50%) arranged in a randomized complete block design with three replications. We evaluated dry matter, nutrient uptake, yield and specific gravity. The analysis showed that the most important elements were N, P, K, Ca, Mg, Zn, B and S, with higher absorption in the 113 days after planting (dap) with the commercial control, technical recommendation + 50% and technical recommendation, from highest to lowest. There were no statistically significant differences in yield for commercial control, technical recommendation + 50% and technical recommendation, but the economic analysis showed that the critical level of fertilization was found in commercial control.