摘要：En el estado de Coahuila, México, se reportaron pérdidas económicas por rajado del fruto (RF) en nogal pecanero, probablemente relacionadas con carencias nutrimentales. Considerando lo anterior se evaluó la ocurrencia del RF en respuesta a fertilizaciones foliares en cultivares Wichita y Western. Para ello, se aplicaron macronutrimentos, micronutrimentos y una mezcla de ambos. A mediados del ciclo se estimó la ocurrencia de RF y se muestrearon hojas de ápices que soportaban nueces no rajadas o rajadas para determinar su contenido nutrimental. El RF solo se observó en el cv. Wichita y aunque las aspersiones mejoraron su nutrición, no hubo diferencias estadísticas en el porcentaje de nueces rajadas comparadas con un testigo. Finalmente, los foliolos de ápices con nueces rajadas presentaron mayor concentración de nitrógeno (N) y menor concentración de fierro (Fe) que aquellos con nueces no rajadas. Esto sugiere que el N y el Fe tienen una función importante en las causas del RF del pecanero.
其他摘要：Northern Mexican pecan growers from Coahuila reported yield losses caused by the water stage fruit split (WS) probably linked to nutrient deficiencies. Therefore, the effect of foliar fertilizations on the occurrence of WS in Wichita and Western pecan cvs. was evaluated. First, trees were sprayed with macronutrients, micronutrients or both. At the midpoint of the growing season, the percentage of split nuts was measured and the leaflets from leaves next to nut clusters containing non-split and split fruits were sampled to measure their nutrient concentration. The WS was only detected in Wichita trees, but even if the fertilizations improved their nutrient status, compared to non-fertilized control, they did not significantly impact the WS occurrence. However, leaflets next to split fruit containing clusters showed higher nitrogen (N) and lower iron (Fe) concentration than leaflets next to non-split clusters. This suggests that N and Fe play an important role on the WS disorder.
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