La. Stat. tit. 47 § 1707
For the purpose of applying the exemption from ad valorem taxation provided in R.S. 47:1703(A)(13), the term "agricultural machinery and other implements used exclusively for agricultural purposes" shall mean agricultural and horticultural implements immediately and directly employed in cultivation, production, and harvest of crops or in the raising and management of livestock in use upon agricultural lands. The term also shall include machinery for soil preparation and cultivation, agricultural drills and planters, fertilizer spreaders, crop-dusting airplanes, harvesting and threshing machinery, hay or grass mowers except lawn mowers, farm wagons and carts, milking machines, farm structures, except a building used for a principal residence, on-farm equipment for the handling or drying of agricultural or horticultural products, and parts of any of the foregoing, all equipment utilized in the logging of timber whether used by the owner or lessor of the agricultural land or on a contractual service basis by someone other than the owner or lessor but shall exclude, except as otherwise provided herein, bulldozers, earth moving, and land-clearing equipment utilized in such agricultural activities on a contractual service basis by someone other than the owner or lessor of the agricultural lands involved.
La. R.S. § 47:1707