An agricultural work machine , comprising: a communication system configured to receive a map that includes values of a biomass characteristic corresponding to different geographic locations in a field; a geographic position sensor configured to detect a geographic location of the agricultural work machine ; an in-situ sensor configured to detect a value of an agricultural characteristic corresponding to the geographic location; a predictive model generator configured to generate a predictive agricultural model that models a relationship between the biomass characteristic and the agricultural characteristic based on a value of the biomass characteristic in the map at the geographic location and the value of the agricultural characteristic detected by the in-situ sensor corresponding to the geographic location, a predictive map generator configured to generate a functional predictive agricultural map of the field that maps predictive control values to the different geographic locations in the field based on the values of the biomass characteristic in the map and based on the value of the agricultural characteristic; wherein the predictive map generator is configured to generate the functional predictive agricultural map based on the values of the biomass characteristic in the map and based on the predictive agricultural model; a controllable subsystem ; and a control system configured to generate a control signal to control the controllable subsystem based on the geographic location of the agricultural work machine and based on the control values in the functional predictive agricultural map. a communication system configured to receive a map that includes values of a biomass characteristic corresponding to different geographic locations in a field; a geographic position sensor configured to detect a geographic location of the agricultural work machine ; an in-situ sensor configured to detect a value of an agricultural characteristic corresponding to the geographic location; a predictive model generator configured to generate a predictive agricultural model that models a relationship between the biomass characteristic and the agricultural characteristic based on a value of the biomass characteristic in the map at the geographic location and the value of the agricultural characteristic detected by the in-situ sensor corresponding to the geographic location, a predictive map generator configured to generate a functional predictive agricultural map of the field that maps predictive control values to the different geographic locations in the field based on the values of the biomass characteristic in the map and based on the value of the agricultural characteristic; wherein the predictive map generator is configured to generate the functional predictive agricultural map based on the values of the biomass characteristic in the map and based on the predictive agricultural model; a controllable subsystem ; and a control system configured to generate a control signal to control the controllable subsystem based on the geographic location of the agricultural work machine and based on the control values in the functional predictive agricultural map. <EOS>