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ISHS Acta Horticulturae 237: XI Workshop on Labour and Labour Management

TWO DIFFERENT COMPUTER BASED MODELS FOR PRODUCTION PLANNING IN VEGETABLE AND FLORICULTURE FIRMS

Authors:   W. Lentz, H.H. Buchwald
Abstract:
The paper will outline the theoretical background of two different production planning models.

One model is based on a traditional approach and the planning procedure is divided into two parts. In the first step the model user defines a number of different production methods. The second step is to find a good or optimal combination of the defined production methods in order to maximize the cross margin. For this, various restrictions as e.g. the glasshouse area and the available working time have to be taken into account. This task can be supported by linear programming or simulation. The developed production planning program offers either opportunity and also allows to combine both methods.

The second planning model has been developed for growers and consultants in pot plant production. Contrary to the traditional approach, production methods now are not predetermined. Their definition rather takes place during the planning process itself by specifying the date and kind of cultivation actions, supported by a system of functions. These functions consider the seasonal growth rates as well as the effects from the temperature regime. However, there is no formal optimization algorithm that assists the search for an optimal production plan.

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