topdress
/ˈtɑpˌdrɛs/
verb
- To spread fertilizer, compost, or other material on the surface of soil or a lawn without digging it in.
- In spring, gardeners topdress the flower beds with fresh compost.
- You should topdress the lawn with a thin layer of sand to level it.
- He topdressed the vegetable patch with organic fertilizer.