This requires Construction level two, a Master Scientist, a Master Builder, and other builders. Turn your attention to the farm and the broken aqueduct to the north of the lab. Drop your master scientist on the aqueduct and they will start to supervise the work. Drop a Master Builder to start construction, then any other builders you also have. Once the aqueduct is repaired, the farm will be ready. As you have the Master Scientist and any builder, and not a Master Builder, will suffice. At this point, the purple masked farmer will convert to your tribe and drop a piece of the necklace. Have a child pick it up. It will require two hours in fast speed for the food to grow, but you can make it bloom instantly if you have the instant bloom "godly" power.