I am researching commercial hydroponics to be use in a vertical plant factory (CEA). Can you explain or point me to texts that will explain a few things? I am reading Hydroponic Food Production By Howard M. Rest 7th ed. 1) How does osmotic pressure affect the transport of nutrients into plant roots? and how can this pressure be manipulated to force / promote absorption in the presence of augmented CO2 environment and high PPFD to increase photosynthesis rate? 2) How does vapor pressure deficit work and does it interact with question 1? Sincerely, Michael V. Theriault