The broadfork, also called a U-fork or grelinette, is a

garden tool A garden tool is any one of many tools made for gardening and landscaping, which overlap with the range of tools made for agriculture and horticulture. Garden tools can be divided into hand tools and power tools. Hand tools Today's garden tool ...

used to manually break up densely packed soil, including

hardpan In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer ...

, to improve

aeration Aeration (also called aerification or aeriation) is the Systems engineering process, process by which air is circulated through, mixed with or solvation, dissolved in a liquid or other substances that act as a fluid (such as soil). Aeration proces ...

and

drainage Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess of water. The internal drainage of most agricultural soils is good enough to prevent severe waterlogging (anaerobic conditio ...

. Broadforks are used as part of a no-till or reduced-till seedbed preparation process because they preserve the soil structure and avoid the resurfacing of weed seeds. It consists of five or so metal tines, approximately eight inches long, spaced a few inches apart on a horizontal bar, with two handles extending upwards to chest or shoulder level that form a large U-shape. The operator steps up on the crossbar, using full bodyweight to drive the tines into the ground, then steps backward while pulling backwards on the handles, causing the tines to lever upwards through the soil. This action leaves the soil layers intact, rather than inverting or mixing them, preserving the

topsoil Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Description Topsoil is composed of mineral particles and organic matt ...

structure. A broadfork can be used in a

garden A garden is a planned space, usually outdoors, set aside for the cultivation, display, and enjoyment of plants and other forms of nature. The single feature identifying even the wildest wild garden is ''control''. The garden can incorporate both ...

, or practically for one to two

acre The acre is a unit of land area used in the imperial Imperial is that which relates to an empire, emperor, or imperialism. Imperial or The Imperial may also refer to: Places United States * Imperial, California * Imperial, Missouri * Imp ...

s (4,000 to 8,000 m²). For larger areas, a

tractor A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most common ...

- or animal-powered

chisel plow A chisel is a tool with a characteristically shaped cutting edge (such that wood chisels have lent part of their name to a particular grind) of blade on its end, for carving or cutting a hard material such as wood, stone, or metal by hand, stru ...

or similar tool is usually employed.

U-bar

A u-bar is similar to a broadfork but has longer tines - up to - for deeper cultivation, since it is meant to be used in beds that have already been double dug at least once. A u-bar also has "elbows" that allow the tines to be raised above soil level when the handles are tilted all the way back. Thus, clumps of soil that get caught on the tines can be broken up by shaking the handles up and down, rocking the tool on its elbows. Whereas double digging a one hundred square foot (9.3 square meter) bed can take several hours, tilling the same bed with a u-bar can often be done in a half hour or so.

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U-bar

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