En el estado de Nayarit, México, no se han realizado ensayos sistemáticos de fertilización en mango. Esta investigación tuvo el objetivo de evaluar el efecto a corto plazo (2010- 2012) de la fertilización de sitio específico (FSE) sobre el crecimiento de los árboles, producción y tamaño de fruto en mangos ‘Kent’ y ‘Tommy Atkins’ cultivados sin riego en Nayarit. Para cada cultivar se usaron dos huertos establecidos en suelos de diferente tipo y nivel de fertilidad. Lo tratamientos de fertilización fueron determinados de manera independiente para cada huerto y fueron: 1) dosis normal, para un rendimiento de 20 t·ha-1; 2) dosis alta, 1.5 veces la dosis normal; y 3) control, sin fertilización. En 2011 y 2012 se realizaron análisis nutrimentales foliares en hojas del flujo de verano (‘Kent’) y otoño (‘Tommy Atkins’), así como de suelo (2010, 2011 y 2012). El calcio fue aplicado como yeso a cal, según el análisis de suelo. Se empleó un diseño experimental completamente al azar con 20 repeticiones (árboles) por tratamiento y por huerto. La FSE no incrementó el crecimiento de los árboles. Los nutrientes aplicados (N, P, K, Ca, Mg, S, Fe, Mn, Zn, B) sólo incrementaron las concentraciones foliares de S, Mn y B (‘Kent’) y de N, Fe, Zn y B (‘Tommy Atkins’). En ‘Kent’ la mayor producción de fruto (138.2 kg·árbol-1) fue obtenida con la dosis Normal, aplicando anualmente (según el huerto) por  árbol: 678-794 g N, 243-270 g P2O5, 259-325 g K2O, 37-66 g Mg, 12-47gFe,7-40gMn,5-6gZny9-17gB.En‘TommyAtkins’ la máxima producción (186.9 kg·árbol-1) correspondió a la dosis Alta: 548-604 g N, 219-328 g P2O5, 455-572 g K2O, 45-70 g Mg,33-58gFe,15-35gMn,6-12gZny27-47gBporárbol.

There is considerable diversity in fertilization management of ‘Ataúlfo’ mango (Mangifera indica L.) in the state of Nayarit, Mexico, and there is no systematic information available in this regard. The aim of this research was to evaluate the medium-term effect (2010‑14) of the site-specif ic fertilization approach on fruit yield and size in ‘Ataúlfo’ mango grown under rainfed conditions (annual average summer rainfall 1300-1450 mm). Two commercial orchards at 8 × 8 m spacing, one each in San Blas and Compostela municipalities in Nayarit were chosen. Fertilization treatments were: 1) Normal dose, which considered tree nutrient demand, periods of maximum root growth, nutrients provided by the soil, leaf nutrient concentrations and fertilization eff iciency; 2) High dose (1.5 times the normal dose); 3) Control, annual application of 3 kg per tree of 17-17-17 (N, P2O5, K2O). Soil and leaf samples were taken for nutrient analysis throughout the study. Treatments were randomly applied to 20 single tree-replicates at each orchard. For cumulative yield and fruit size a 2 × 3 factorial arrangement (orchards × treatments) was used. For leaf nutrient concentrations, the year and fertilization treatments effect was analyzed using 10 replicates per treatment. Means comparison was performed with the Waller-Duncan test (P ≤ 0.05). The Normal dose increased yield 38% as compared to the Control, as well as fruit size. The highest total fruit yield and C22 (196-220 g) and C20 (221-250 g), as well as the highest cost-benef it, were obtained with the Normal dose. This treatment consisted of applying per year and tree, depending on the orchard, 509-608 g N, 21-206 g P, 132-582 g K, 19-234 g Mg, 6.5-18 g Fe, 6-46 g Mn, 2-6 g Zn and 3-13 g B.

El llamado “moteado de las hojas” en el cultivo de aguacate está ampliamente distribuido en las zonas de producción más importante de México, y se desconoce los factores involucrados en la aparición de este síntoma foliar. Por ello, se contrastó el contenido nutrimental en hojas de aguacate ‘Hass’ colectadas de árboles sin la presencia del moteado (tratamiento A), contra hojas que tampoco manifestaran el síntoma pero provenientes de árboles con el daño foliar (tratamiento B) y hojas con la presencia del síntoma (Tratamiento C). Se encontró que, aquellas hojas con “moteados” intervenales tuvieron menor concentración de N, P, K, y Mn, respecto a las que no presentaron el síntoma, mientras que las concentraciones de Ca, Mg, Fe, Zn, Cu y B hojas con y sin moteado fueron similares.

There is considerable diversity in fertilization management of ‘Ataúlfo’ mango (Mangifera indica L.) in the state of Nayarit, Mexico, and there is no systematic information available in this regard. The aim of this research was to evaluate the medium-term effect (2010‑14) of the site-specif ic fertilization approach on fruit yield and size in ‘Ataúlfo’ mango grown under rainfed conditions (annual average summer rainfall 1300-1450 mm). Two commercial orchards at 8 × 8 m spacing, one each in San Blas and Compostela municipalities in Nayarit were chosen. Fertilization treatments were: 1) Normal dose, which considered tree nutrient demand, periods of maximum root growth, nutrients provided by the soil, leaf nutrient concentrations and fertilization eff iciency; 2) High dose (1.5 times the normal dose); 3) Control, annual application of 3 kg per tree of 17-17-17 (N, P2O5, K2O). Soil and leaf samples were taken for nutrient analysis throughout the study. Treatments were randomly applied to 20 single tree-replicates at each orchard. For cumulative yield and fruit size a 2 × 3 factorial arrangement (orchards × treatments) was used. For leaf nutrient concentrations, the year and fertilization treatments effect was analyzed using 10 replicates per treatment. Means comparison was performed with the Waller-Duncan test (P ≤ 0.05). The Normal dose increased yield 38% as compared to the Control, as well as fruit size. The highest total fruit yield and C22 (196-220 g) and C20 (221-250 g), as well as the highest cost-benef it, were obtained with the Normal dose. This treatment consisted of applying per year and tree, depending on the orchard, 509-608 g N, 21-206 g P, 132-582 g K, 19-234 g Mg, 6.5-18 g Fe, 6-46 g Mn, 2-6 g Zn and 3-13 g B.