Possibilities of utilization of waste bark of forest trees for substrate production [tomatoes, yields, peat, spruce]

agronomic characters animal litter bark products cama (animales) combustible combustibles conifere conifers crops cultivos desechos economic plants energia energie energy energy sources forest products fruit vegetables fuels gimnospermas growing media gymnosperme gymnosperms hortalizas (plantas) hortalizas de fruto medio de cultivo medios de enraizamiento milieu d'enracinement natural resources peat picea pinaceae plantas plante plante de culture plants productividad productivity productos productos forestales products produit produit forestier profitability recursos recursos naturales rendement rendimiento rentabilidad resources ressource ressource naturelle rooting media solid wastes substrat de culture tomate tomatoes tourbe trozos de corteza turba vegetable crops wastes yields