Abstract of
JP10000001
PROBLEM TO BE SOLVED: To surely introduce snow water into a subsurface soil layer, feed nutrients and air thereto and efficiently improve the soil by leading a part of a plowed soil layer to the subsurface soil layer and making the soil in the plowed soil layer mix in the soil of the subsurface soil layer. SOLUTION: Snow water 12 present on the lower side of a snow cover zone 11 is led through a wide slit formed after the passage of a slit extending unit 30 attached to a knife 22 to the subsurface soil layer 15 while performing operations to crush the subsurface soil with a subsoiler operating machine 20 and forming the wide slit with the slit extending unit 30. A part of a plowed soil layer 13 is simultaneously led to the subsurface soil layer 15 to make the soil in the plowed soil layer 13 mix in the soil in the subsurface soil layer 15. Thereby, the soil is improved. Furthermore, the slit extending unit 30 is preferably freely detachably attached to at least a part corresponding to the lower side of the subsurface soil layer 13 relatively to the knife 22 of the subsoiler operating machine 20.
