Harrows are mentioned in the Bible and are as ancient as the plow. The first such implements were nothing more than a carefully selected tree trunk or limb with protruding branches, that scratched the soil when pulled along by hand or behind an animal.
Early American farmers made an A-harrow that consisted of timbers or a forked log , through which wooden or iron pegs were driven. Especially useful on just cleared fields that often were full of stumps and rocks, the A-harrow was strong and would slide around obstructions rather than get caught on them. By the s, square harrows, made of wood with wrought or cast iron teeth were popular.
However, the iron teeth often snapped off when a rock or other obstruction was struck. Finally, after the War Between the States, manufacturers began to use steel teeth and iron frames, and added levers to change the angle of the teeth. These spike tooth harrows changed very little from then on.
Of course, the way a harrow is usually used requires the operator to walk either behind, or to one side of the machine. These many miles of walking in soft, mellow soil is very tiresome. An old Zane Grey book, titled The Desert of Wheat , gives an account of a man harrowing with four horses in a Washington wheat field. At every sheeted cloud, whipping back from the hoofs of the horses and the steel spikes of the harrow, he had to bat his eyes to keep from being blinded.
Since the s, use of disk harrows has decreased dramatically, with wider acceptance being given to cultivators that do the same job more efficiently. Disk harrows differ from disk plows in that the plows move the soil in one direction while the harrow moves it in opposing directions.
Disk plows have three to six individually mounted disks. Disk harrows have rows of blades, called gangs, mounted on axles. The single-acting disk harrow has a pair of opposing blade gangs pulled by a tractor. The tandem disk harrow has two sets of opposing gangs. The offset disk harrow has one gang trailing another, in which the line of pull is far to one side of the till strip, making it favorable for tilling under low tree branches, as in orchards.
Another type of harrow is the spike-toothed harrow. Used to smooth the soil after plowing, it performs the same function as a rigid-tined garden rake. This section contains words approx. Definition for discing 2 of 2. Sharen Ontoria Pundit. What is plowing in agriculture? As the plough is drawn through the soil, it creates long trenches of fertile soil called furrows. Jianqiang Elders Pundit. What does disc mean? S - Steadiness.
C- Conscientiousness. Julieta Niedermuller Teacher. What machine is used for Ploughing? A farm tractor is used for pulling or pushing agricultural machinery or trailers, for ploughing, tilling, disking, harrowing, planting, and similar tasks. Sarasvati Arnaud Teacher. What is a 3 point cultivator used for?
It works great on crops grown on plastic mulch by removing the center gang. Ineva Pijuan Supporter. What is the function of disc plow? The disc plough is designed to work in all types of soil for functions such as soil breaking, soil raising, soil turning and soil mixing. It is used to open the new fields and to process the stony areas. It can be used easily at rocky and rooted areas. Ask A Question. Co-authors: 5. Updated On: 4th October, Views:
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