Possible Clues:

• Soil of decayed foliage
• Compost from month in fall, due to decay?
• Decayed matter used to improve soil
• Source of earth contributing to all of mud (churned)?
• Humus
• Cast taking something out of the book from the start is bound to invigorate The Field
• Sheet with pattern that adds richness to the bed?
• Foul lake made unusual compost
• Page cast? This is needed to invigorate The Field!
• Compost in meadow starts to form methane early we're told