Fertilizers increase crop yields and enable plants to grow in planetary environments that lack the necessary nutrients due either to natural conditions or as a result of large-scale harvesting and grazing. Fertilizers are also a key component of the terraforming process, acting as a catalyst to accelerate the production of the self-sustaining plant ecologies that regulate climate and provide food for more advanced lifeforms. * Best Buy: Planet Houston for 30 credits. * Best Sell: Planet Crete for 285 credits. * Max Profit: 255 credits per unit.