BRAINCAKEAgricultural Glasshouses and Limiting Factors
Commercial growers use glasshouses (greenhouses) to control limiting factors, so crops photosynthesise faster, grow faster and give higher yields.
• Carbon dioxide: the concentration is raised from about 0.04% to around 0.1%, for example by burning paraffin or natural gas, or releasing pure carbon dioxide from cylinders. Burners also warm the air. Higher concentrations give little extra benefit and can close stomata.
• Light: glass lets light through, and artificial lighting extends day length and raises light intensity on dull days and in winter. Lamps are chosen to emit red and blue wavelengths, which chlorophyll absorbs best.
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More in Energy for Biological Processes
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All 17 lessons in Energy for Biological Processes · All OCR A-level Biology topics