Figure 3. Photosynthetic activity in different wavelengths of light radiation. 5.-Design and Development a Control and Monitoring System for Greenhouse Conditions Based-On Multi Agent System

<p>The greenhouse protects the plants from the extreme weather conditions. However, if the<br> period of daylight prevents the photosynthetic activity, the plants do not grow. Horticultural lighting<br> allows the grower to extend the growing season. It enables a year-round producing of plants or<br> makes it possible for the grower to start sowing in early spring and continue season till the first<br> frost. Plants need about 10-12 hours light to improve growth. When the plants are producing<br> flowers or fruits the supplemental need of light per day increases up to 16 hours. Figure 3 shows the<br> photosynthetic activity in different wavelengths of light radiation [16].</p>