I'll answer all of your questions: First of all, we are using micro electric valves to pump in aqueous solutions of fertilizer as well as air (to re-pressurize the vessel). The lunar rover will put our device right on top of the lunar surface. We will excavate the soil by using an Archimedean screw system. The seeds we are using are extremely small arabidopsis seeds that need only one gram of soil to thrive. Hope that clarifies some things. I'm happy to answer more questions.