[header] How to add nitrogen to compost [title] Add fresh grass clippings to the compost. [step] Collect the grass clippings left after you mow your lawn. Add the clippings in thin layers to the compost so that it doesn't clump up into big chunks. 
[substeps] Make sure that your grass clippings are fresh because dried grass clippings will add carbon to the compost. [title] Add leafy plant clippings to the compost.