What is the importance of arrangement of light in green houses
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Answer:
Plants are the only organisms capable of the amazing feat called photosynthesis, by which carbon dioxide and water are converted into carbohydrates using light. Light from the sun, or other sources runs the greenhouse. Greenhouse should provide a space with optimal conditions (light, temperature, nutrition, pest control, etc.) for the plants so that they can perform photosynthesis. Often, natural sunlight is enough, and can be even too intense for some plants in terms of light but also in terms of temperature. Because the sun reflects through the glass of the greenhouse, the temperature can increase drastically and be above the temperature required for the plants. In those cases of excess light from the sun, shading or cooling by other means is required. Greenhouse mechanical cooling sytems (ventilation, etc.) are obviously important in this regard and will be discussed in Chapter 6. However, reducing light levels to control temperature is a task that should be studied carefully; for example, mechanical cooling may be better option for plant growth than reducing light so that plants are not suffering from lack of light. Actually, one of the most important challenge of a greenhouse managers will be to provide plants with enough sunlight to grow them optimally. This is particularly true in North temperate locations like the North Eastern or North Western US, where cloud cover during the winter months does not provide plants with optimal light for photosynthesis. Therefore, under these conditions, supplemental lighting is usually required.