Fig. 26: Revenues at different treatments

4.4.4 Profit margin

The profit margin is a parameter for the economy of growing a crop. It is calculated by substracting the variable costs from the revenues. The revenues itself, is the product of the price of the sale of the berries and kg yield. For each kg of strawberries, growers are getting about 2.600 ISK from Sölufélag garðyrkjumanna (SfG). Therefore, the revenues increased with more yield (Fig. 26). With the choose of the variety Sonata increased the revenue slightly compared to Magnum. The light source had no influence on the revenue.

Fig. 26: Revenues at different treatments.

When considering the results of previous chapter, one must keep in mind that there are other cost drivers in growing strawberries than electricity alone (Tab. 7). Among others, this are e.g. the costs for the plant itself (≈ 1.200 ISK/m2), soil (≈ 300 ISK/m2), gutters and other material (≈ 50 ISK/m2), costs for plant protection (≈ 300 ISK/m2) and beneficial organism (≈ 250 ISK/m2), plant nutrition (≈ 100 ISK/m2), CO2 transport (≈ 150 ISK/m2), liquid CO2 (≈ 1.000 ISK/m2), the rent of the tank (≈ 150 ISK/m2), the rent of the green box (≈ 150 ISK/m2), material for packing (≈ 350 ISK/m2) and transport costs from SfG (≈ 100 ISK/m2) (Fig. 27).