Abstract: Tube slotting machine for cutting series of transverse slotted openings in flexible corrugated tubing comprises main framework with tube supporting and conveying structure connected thereto for guiding tubing through machine. Cutting structure is adapted to engage tubing as it travels through machine and to cut transverse slotted openings therein. Cutting structure includes plurality of primary cutter blades, and equal number of spaced apart secondary blade pairs are arranged with one primary blade located between each pair. Each secondary blade has curved portion that complements curvature of tubing. Secondary blades are positioned next to exterior of tubing as it moves through machine along its path of travel, and primary cutter blade is shifted across its associated secondary blade pair so that primary blade penetrates tubing and sweeps across secondary blade pair to thereby cut slivered portion from tubing to provide transverse slotted opening therein.

Abstract: Device for covering drainage tubing with fine textured soil granules comprises main framework with pair of tillers connected thereto by adjustable connection which varies elevation of tillers relative to main framework. Each tiller includes vertically oriented shaft journaled to secondary frame, and tines extend outwardly from each shaft. Motivators are connected to rotate each shaft so that tines penetrate side walls of trench in which drainage tubing has been positioned to thereby break away fine textured soil granules and shower them over drainage tubing.