ECONOMIC ASPECTS OF ENERGY SAVING IN GREENHOUSES: AGRONOMIC CONSIDERATIONS
This paper is the second part of a study evaluating financial consequences of various greenhouse energy saving techniques. In the first part (Danloy et al., this symposium) the method and cropping schedules were defined; energy gains and additional investment were assessed for different systems, assuming no crop losses. The present paper introduces the effect of energy saving systems on crop yields and these are then incorporated in the financial balance. It shows that resultant production losses could make their profitability questionable, particularly for produce of high commercial value (chrysanthemums). The glass Hortiplus remains profitable if it causes little or no loss of yield. A screen is only worthwhile if fuel is very expensive (0.7 to 0.8 $/kg) and assuming an optimal installation. In the market gardening crop schedule delayed opening of the screen somewhat increases profitability.
Mercier, A., Reist, A., Jolliet, O., Danloy, L. and Munday, G.L. (1989). ECONOMIC ASPECTS OF ENERGY SAVING IN GREENHOUSES: AGRONOMIC CONSIDERATIONS. Acta Hortic. 245, 560-567