Hi Vivian. Clovers have the ability to capture free nitrogen from the atmosphere and fix it into the soil, thereby improving the soil and making the nitrogoen biologically available to other plants (including figs!).
But to do this, the clover plants work in a symbiotic relationship with bacteria. If you dig up a healthy clover plant you can actually see little nodules (tiny bumps) on the clover roots where the bateria are at work. The "innoculent" is a dry, powdered bacteria that you mix in with the clover seed before planting. Iti's inexpensive, you don't need much, and you can usually find it in a small bag right next to the clover seed in a local garden store (or order it online). I'm not sure it's absolutely necessary to add the innoculent, as there could already be suitable bacteria in your local soil for the clover to partner with, but it's cheap insurance so I always use it when planting clover seed to improve soil quality and fertility.
Amounts vary of course, but in some studies nitrogen fixed by acre per year ranged from 70 to 275 pounds per acre. Over the years, that's a lot of free, organic, bio-available nitrogen for your plants for very little intitial investment. I think I spent about 25 dollars all together, and you may not need 10 pounds of clover seed. We mixed the clover seed and innoculent in with the grass seed when we overseeded in the fall. It ended up great, an easy care, soil improving, healthy organic lawn and orchard grass with pretty little clover flowers scattered here and there, but the pure grass lawn purests have probably fainted by now if they are reading this.
North Georgia Piedmont