[Changes in productivity of vegetable crop rotation and fertility of leached chernozems as dependent on application of fertilizers. Report 1. Peat and mineral fertiliser effect on yield and quality of vegetable crops and potato [Field trials in West Siberia]]

calidad chernozem chernozems crop yield engrais npk fertilidad del suelo fertilizantes npk hortalizas (plantas) npk fertilizers papa peat pomme de terre potatoes quality rendement des cultures rendimiento de cultivos soil fertility tourbe turba vegetable crops