"Plant fertilizer" refers to a substance that is added to the soil or plants to provide them with essential nutrients that they need to grow and stay healthy. Full definition
The installation features a large scale physical diagram that shows the role our bodies play in the water cycle, and DIY kits for using your pee as plant fertilizer will be available. (treehugger.com)
So I recently did some digging trying to find some recipes for homemade plant fertilizer and these are a few of what I found. (naturalhealthezine.com)
CO2 is of course a potent plant fertilizer increasing plant growth and crop yield. (rabett.blogspot.ru)