We usually put Manure on our plot.
This year i grew pumpkins for the first time and i was wondering why they weren't producing fruit. I spoke to another plot holder who told me it was because i wasn't feeding them enough and recommended chicken pellets. After applying around the plant stem they fruited lovely, infact i got one that was 25lb in weight.
I also used them in my green house while i went on holiday. I have a irrigation system on a timer but that doesn't feed!! so slow release pellets worked well.