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RUSSIAN COMFREY AND ITS HISTORY
Bocking No 17 53
THE MODERN COMFREY GROWERS
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acid Agricultural alkaloid allantoin amino-acids analysis animals Average bacteria birds Britain carbohydrate cattle cent per cent chemical Chingola clones comfrey flour comfrey growers comfrey plants comfrey root comfrey tea compost cows crop crude protein cultivation cut comfrey deep litter diet digestible dried dry matter eelworm eggs experiments extract farm farmers feed fertilizer fibre fishmeal flower colour flower stems fodder garden grass green food grow grown growth Henry Doubleday herbal horses inches Kenya leaf leaves leucocytosis lucerne manure meal medicinal milk minerals moisture Newman Turner nitrogen Philip Christison Phosphoric acid pigs plot possible potash potatoes poultry Prickly Comfrey produce protein quantity rhizome root cuttings Russian Comfrey samples season seed silage sludge soil symphytine Symphytum asperrimum Symphytum officinale Thomas Christy tons an acre tons cwt Total trial ground ulcer variations vegans vegetable vitamin Vitamin B12 weeds winter yield