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Africa alkaloid Allantoin amino acids analysis Andrew Hughes arthritis Average birds Bocking Booking Britain clones comfrey flour Comfrey ointment comfrey plants Comfrey Report Comfrey root Comfrey tea compost convector heater cows crop cure cut comfrey deeplitter diet Doubleday Research Association dried comfrey eelworm eggs experiment extract farm farmers feeding comfrey fertilizer fiber flower stems fodder fresh comfrey gallon garden grass heal Henry Doubleday horse inches June Kenya leaf leaves liquid manure litter lysine manure meal medicinal method milk mixture monocrotaline mulch Newman Turner nitrogen normal officinale pain Philip Christison pigs pint Plot potash potatoes poultices poultry pounds proportion protein quantity Rhodesia Russian Comfrey rust sample season seed silage skin Sludge soil symphytine Symphytum Symphytum officinale teaspoonfuls tomatoes tons an acre Tons Cwt Total Trial Ground ulcer variations Vegans vegetable vitamin B12 Webster strain weeds weeks weight wilted yield