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FIELD : agriculture.SUBSTANCE : invention relates to the field of ecology, in particular the assessment of mountain slope lands, and may find application in the appraisal of mountain meadows. The method comprises an assessment of the territory by the presence of legumes components. At that during vegetation in areas of mountain slopes the distribution of leguminous perennial grass with creeping-rooted system is measured, such as white clover - Trifolium repens, inconstant clover - Trifolium ambigum, creeping crown vetch - Carolina varia, licorice-leaf astragalus - Astragalus glycyphyllos, angular astragalus - Astragalus waldstetkit. Then the area occupied by these plants is measured. In the presence of the amount of creeping-rooted plants of more than 10% the land is located in a favourable environmental condition. In case of reduction in the area of the amount of legumes components of less than 10% the mountain slopes are improved by seeding grasses of the said species.EFFECT : method enables to reduce soil erosion processes, to improve soil fertility and ecological status of the territory.2 ex