Determination of Effective Policies for Ecological Agriculture Development with System Dynamics and Agent Based Models – Case Study in Slovenia - Efficient Decision Support Systems: Practice and Challenges from Current to Future - page 362

INIT CONV_FARMS = 77000
FLOW CONV_FARMS = -DT*TRANSITIONS
DOC CONV_FARMS = THE NUMBER OF CONVENTIONAL FARMS WHICH ARE
CANDIDATE FOR ENTERING THE CONTROL SYSTEM.
UNIT CONV_FARMS = FARM
INIT ORGANIC_FARMS = 1728
FLOW ORGANIC_FARMS = +DT*TRANSITIONS
DOC ORGANIC_FARMS = ORGANIC FARMS.
UNIT ORGANIC_FARMS = FARM
INIT SUPPORT_RESOURCES = 500
FLOW SUPPORT_RESOURCES = +DT*SELF_ORG_SUPPORT_RES
+DT*ADDITION_TO_THE_SUPPORT_RESOURCES
-DT*APPLICATION
DOC SUPPORT_RESOURCES = SIZE OF SUPPORT RESOURCES DETERMINES
THE ATRACTIVENESS OF ORGANIC FOOD PRODUCTION.
UNIT SUPPORT_RESOURCES = FARM
AUX APPLICATION = RAPU*ORGANIC_FARMS
DOC APPLICATION = APPLICATION OF SUPPORT RESORUCES DIMINISHES
THE AVAILABILITY. CONSEQUENCE: LOST OF FOCUSS AND ACTRACTIVENESS.
UNIT APPLICATION = FARM/YEAR
AUX SELF_ORG_SUPPORT_RES = 1000+SELF_ORG_SPREAD_DLY
DOC SELF_ORG_SUPPORT_RES = HOW MANY FARMS COULD BE SUPPORTED BY
SELF-SUPPORT ACTIONS.
UNIT SELF_ORG_SUPPORT_RES = FARM/YEAR
AUX TRANSITIONS = ((ORGANIC_FARMING_GOAL-

ORGANIC_FARMS)/TRANS_CONST)*COMM_SUCCESS
DOC

TRANSITIONS = TRANSITION FROM CONVENTIONAL FARMS TO ORGANIC

FARMS.
UNIT TRANSITIONS = FARM/YEAR
AUX ADDITION_TO_SELF_ORGANIZATION_RESOURCES =

PROMOTION_FACTOR*ORGANIC_FARMS
DOC ADDITION_TO_SELF_ORGANIZATION_RESOURCES = EFFORT TO PROMOTE
SELF-ORGANIZING RESOURCES.
UNIT ADDITION_TO_SELF_ORGANIZATION_RESOURCES = FARM
AUX COMM_SUCCESS =

SUCCES_FACTOR*COMMUNICATION*TRANSITION_F_BASED_ON_PRODUCTION
DOC COMM_SUCCESS = CONVICED FARMERS DECIDE TO TRANSFORM.
UNIT COMM_SUCCESS = FARM/YEAR
AUX COMMUNICATION =
Fig. 4. Examples of model equations
Agent-based approach
In our research the agent-based approach has been considered as the possible way to
analyze the dynamics of transition to organic farming. By this, one could compare both
methodologies, System Dynamics and Agent-Based modeling. In Agent based model built
with AnyLogic (Borschev and Filippov, 2004) shown in figure 4; we define the agents as
farms. The model is represented by two agent states; 1) Conventional Farms (red) and 2)
Organic farms (green). Transition among particular states is determined by the promotion of
organic farming and information spread. The contacts in the state of organic farming is also