IMPROVEMENT OF THE THERMAL ENVIRONMENT OF THE PROPAGATION HOUSE AND ITS EFFECT ON THE TOMATO FRUIT-SET
The thermic balance of the protections used to produce tomato plants has been improved by means of three low energy cost methods and their effects on flowering and fruit setting has been studied. The three methods were: 1. low heating with a minimum limit of 9–10°C 2. double wall of polyethylene; 3. second indoors cover with low polyethylene tunnels. There was also a control covered with a single layer of polythene. The improving effect of the environmental conditions during the first weeks of life on the reproductive behaviour of the tomato has been shown. In a second place after the heating treatment, the use of a double polythene wall with 30 cm air between has been the best method of protection against low temperatures.