Field
From Lotro-Wiki.com
Fields are grown by Farmers when they plant seeds in farmlands. The fields can be harvested to produce either a fair or poor harvest. A critical success on farmer field recipes result in Well-tended fields, which are more likely to produce fair harvests. The chances of a critical success are increased in fields sown with the Soil of Rivendell. Fair harvests can be turned into crops, which are ingredients for cooks with the appropriate farmer recipe. Poor harvests can be turned back into seeds with farmer seed recipes, reducing the need to buy them from farmhand NPCs. Some fields produce rare crops.
Grain Fields
Grain fields are used as part of Farmer Grain Recipes (or Farmer Crops Recipes) and grown in a Grain Farmland.
Pipe-weed Fields
Pipe-weed fields are used as part of Farmer Pipe-weed Recipes and grown in a Pipeweed Farmland.
Vegetable Fields
Vegetable fields are used as part of Farmer Vegetable Recipes and grown in a Vegetable Farmland.

