SOME RESULTS OF RESEARCE ON MICROCLIMATE IN GLASS HOUSES IN BULGARIA
Applying the methods of control in glass-house vegetable growing in full requires forming certain physiological characteristics of plants and environment and programming yields. This means to establish algorythms of control and to design and construct systems allowing optimum control of the conditions of greenhouse environment with sufficient approximation and at compliet limits economic conditions. Further it is necessary to determine these functions of the influencing values at which yield reaches its maximum, and to apply such systems of control which could make control of set values of influencing factors possible with lowest possible investment. In near future the solutions realized in practice shall consist of simple models and systems of control as it will not be possible to fully cover the complex effect of growth and fruit-giving factors. In this respect scietnific-research work is divided in two stages: collecting big amounts of data for the different microclimatic elements and physiological properties of the plants, and developing biological-mathematical models giving a fairly exact description of the phenomenae to give possitive results, and at the same time — sufficiently simplified to be realized.
The purpose of this work is to show the results of the study on microclimate and some physiological properties in field and in experimental glasshouse in Bulgaria and the first single biological-mathematical models developed in this country.
The experiments were carried out in a field glass-house of 30 decares planted with tomatoes Exstas veariety in the Bulfgarplod complex near the town of Pazarjik and the experimental glass-house of “Maritza” — Plovdiv. Temperature and humidity of air, total solar radiation and soil temperature