BIOECOLOGICAL IMPACT OF MEADOW CLOVER ON SOIL FERTILITI ELEMENTS IN FORAGE CROP ROTATIONS
The increase of proportional weight of meadow clover in forage crop rotations up to 20% and 40 %, provided the growth of organic matter mass, biological nitrogen, the elements mineral nutrition penetrating the soil. When meadow clover was introduced to rotational schemes and its specific gravity reached 40 % (rotation no. 3), nitrogen input with green manure mass, post-haying and post-stubble, residues and root system, in comparison to its input in rotation № 2 raised at 2.5 times, phosphorus input - at 3.2 times, potassium - at 2.3 times. The greatest accumulation of the mass of plant residues in crops of red clover - 1.2 t / ha obtained in the rotation number 3 where red clover is used twice in the rotation.