Russian comfrey (Symphytum uplandicum), yield and quality [also include chemical composition]
1986
Pestalozzi, M. (Statens Forskingsstasjon Saerheim, Klepp (Norway)) | Skaland, N. (Norges Landbrukshoegskole, Aas (Norway). Inst. for Plantekultur)
Russian comfrey was tested in Southern Norway in two trials in the Stavanger region (59 degree of northern latitude) and in the Oslo region (60 degree of northern latitude). Russian comfrey was outyielded by both leys and annual fodder crops (Italian ryegrass, Westerwold ryegrass, fodder rape, fodder turnips, marrow stem kale). The crude protein content was somewhat higher, but the digestibility much lower than in grass. Early and frequent cutting raised the protein content and digestibility, but lowered the dry matter yields and plant vigour. New selections from England (Bocking 4 and 14) did not give higher yields than the progenies of Russian comfrey cultivated in Norway since about 1925. Growing of Russian comfrey is not recommended because of low yields, high costs of establishment and a content of toxic alkaloids
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