The aim of the research was to evaluate the influence of middle-field forest patches on the agricultural plantations situated in the areas threatened with water erosion. The yielding of winter wheat and winter rape was investigated during 1997–1999 in the area of Chełm (Lublin province). The studies covered also chosen physical and chemical properties of soils. The crops were harvested from the plots located at different distances from the edge of a forest patch with trees 5 m high. It was found that the properties of soils did not have any significant impact on the grain yield of wheat or the seed yield of rape. The poorest yields were observed in the immediate vicinity of the forest patch. The width of the area affected by the patch did not exceed the height of the trees.

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