Passive Porous Tube Nutrient Delivery System

A primary challenge to growing plants in microgravity is the delivery of adequate air, water and nutrients to a plant's roots. Microgravity alters convection and thus the behavior of root zone aeration which plants are evolutionarily reliant upon to grow. Current nutrient delivery techniques proposed for space involve the use of a medium for the roots to penetrate, such as arcilite, and power or frequent astronaut intervention is typically required to actively pump water to the roots. When water is actively pumped to the roots, the user must carefully calibrate the amount of water and nutrients being pumped in order to prevent over- or under watering that could inhibit plant growth. The current watering technique on the International Space Station using the Vegetable Production System (Veggie) frequently requires astronauts to manually pump water into the pillows with a syringe to sustain the plants.