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On the basis of research and the data of large-scale soil mapping of the old drained territories new threshold values of the organic substance content in peat-mineral horizon for branch degraded histosols from agropeat soils are presented in the conditions of the Republic of Belarus. In course of the study there were analyzed arable peat soils and residual glezative degroturfzems (peat and inorganic soil, mineral and residual turf, mineral and post-turf ones). In course of the study there were analyzed statistical data of ash content, organic matter content and spectral reflectance capacity of upper levels of arable peat soils and residual glezative degroturfzems. There was shown dependence between indexes of reflection coefficient and organic matter content in peat soils of different degree of generation.
