[Fertilizer recommendations for crops by an integral approach]

anglais. The generation of fertilizer recommendations for crops in Mexico has been carried out using the "regional average", "production systems" and "soil testing" approaches primarily, with the production systems approach the most common, and more recently, a "nutrient balance" approach has been introduced. The production systems approach lacks precision due to the fact that it does not take into account variations in soil nutrient contents within the production systems. With the objective of achieving greater precision in crop fertilizer recommendations, a procedure is presented in this study, that combines the soil testing, production systems and nutrient balance approaches. This is applicable in the case where information on crop response to fertilizer and soil, climate and management characteristics are available.

espagnol; castillan. La generacion de recomendaciones de fertilizacion de cultivos en Mexico se ha realizado principalmente mediante los enfoques de la media regional, agrosistemas y analisis de suelo, predominando en las ultimas decadas el de agrosistemas, y recientemente se ha introducido un enfoque de balance nutrimental. El enfoque de agrosistemas presenta un grado no despreciable de imprecision de las recomendaciones, debido a que no considera las variaciones de los contenidos nutrimentales del suelo dentro del agrosistema. En este trabajo se presenta un enfoque combinado de analisis de suelo, agrosistemas y balance nutrimental para la generacion de recomendaciones de fertilizacion de cultivos, para el caso de contar con informacion de experimentos de respuesta del cultivo, a la fertilizacion, y de suelo, clima y manejo, con fines de lograr una mayor precision de las recomendaciones.