INFLUENCE OF DIFFERENT CLIMATIC PROTECTION AND FORCING SYSTEMS ON SOME PRODUCTION PARAMETERS OF STRAWBERRY (FRAGARIA × ANANASSA Duch.) IN SPAIN
Strawberry plants of Chandler, Douglas, Fern and Selva varieties were cultivated using three systems of forcing and in the open air (OA) over a period of two years (1987/88 and 1988/89). The forcing systems were A polyester greenhouse with heating and cooling systems (HG), a big polythene tunnel (BT), and low tunnels (LT). In addition to this, during full blossom of each variety, a vibrator (mechanical bee) and an atomizer were used on the plants.
Marketable production, average fruit weight, and the percentage of malformed fruits were less under HG and BT, with different degrees of significance. The use of the vibrator decreased the percentage of malformed fruits compared with control plants but only during the second year. This percentage was also less in the Fern variety than in the others in both years and Selva gave the greatest percentage of malformed fruits in terms of marketable production.
No significant interactions between any of the analyzed factors were detected in either year of the experiments.