Possible Clues:

• The stuff of bats?
• Fertiliser from the waste of seabirds
• Fertiliser
• Solving sudoku finally with a number -- perhaps, a lot of number twos?
• Droppings as fertiliser
• Seabird excrement, once prized as fertiliser
• Touching month turning over stuff dropped and scattered
• Piece in America about a love for fertiliser
• Working month taken up with fertiliser
• Summer month's upset, having an absence of fertiliser