A dynamic model based on the linear systems theory is developed in designin
g a highly cybernetic farming strategy to efficiently manage residuals gene
rated in farm ecosystems. A linear cybernetic model would be used to descri
be the dynamic behavior of resource flow in the farm ecosystem in which the
state variables are resource quantities, and the control variables are res
idual quantities. The controlled process is defined as the controlled manag
ement strategy change. Cybernetic mechanism shows the application of residu
als as control measures have determinate effects on the controlled process
as along as the farming system is observable and controllable in the contro
l sense. To illustrate the model algorithm the idea is applied to simulate
the dynamic response of residual phosphorus concentrations in an integrated
pig/corn farming system located in the south Taiwan region. General result
s show that the residual phosphorous concentration is influenced by farming
activities which are controlled by a system of gross input and net output
parameters. This paper demonstrates using input-output analysis technique t
hat residuals generated in the farming system is the most important cyberne
tic variable, so that the proper management of residuals alone has the pote
ntial to maintain future productivity and sustainability.