A process for the optimal sulfur fertilization of cultivated plants, characterized in that during a year of cultivation comprising one or more periods of growth and / or periods of intermediate, the following stages are carried out site and time-specific at least once : to. determine an additional sulfur requirement by means of a target crop yield and a sulfur balance before the start of the growth period and give a recommendation for possible additional fertilization, b. estimate the sulfur requirement through the target crop yield at the beginning of the growth period and determine a deviation from the estimate caused by environmental conditions during the growth period, c. if the deviation is negative, experimentally verify a sulfur deficiency in the cultivated plant during the growth period, d. if the deviation is negative, give a recommendation for additional sulfur fertilization, in which the sulfur data required to determine the additional sulfur requirement and to calculate the sulfur balance comprises the calculated bonding effect of the amount of sulfur entrained by rainwater, a decrease in the amount of sulfur caused by washing and decrease in the amount of sulfur caused by soil permeability.Un procedimiento para la fertilización de azufre óptima de plantas cultivadas, caracterizado porque durante un año de cultivo que comprende uno o más periodos de crecimiento y/o periodos de intermedio, las siguientes etapas se realizan de forma específica de sitio y tiempo al menos una vez: a. determinar un requisito de azufre adicional por medio de un rendimiento de cultivo objetivo y un equilibrio de azufre antes del inicio del periodo de crecimiento y dar una recomendación para una posible fertilización adicional, b. estimar el requisito de azufre por medio del rendimiento de cultivo objetivo al inicio del período de crecimiento y determinar una desviación de la estimación provocada por condiciones ambientales durante el periodo de crecimiento, c. si la desviación
