Berta Rotary Plough


The Berta Company of Italy has made the rotary plough applicable as a rear-PTO implement for Grillo G107d and G110 diesel walk-behind tractors.
    
Essentially the rotary plough has a vertical shaft with 4 spiral blades (ploughshares) turning at approximately 300 rpm.  Soil in front of the plough is cut into and then immediately centrifugally discharged to the side as it is inverted.  Basically, in a single pass through sod, the plough will leave 10-12 inches of worked soil.  And because the soil is not trapped under a hood and repeatedly pulverized (like with a tiller), the soil structure is not beaten to death.
 
Tilth of soil is similar to that which has been ploughed and disked with a conventional tractor:  good enough for large seeds and vegetable starts; may need secondary tillage on the top 2-3” for small seeds.  Plough works 8-10” wide per pass, but unlike a tiller, there is no such thing as a ‘second pass’ with a Rotating Plough, so it more than makes up for it’s narrow working width in the fact that it only has to go over the ground once.  The horizontal movement of the blades through the soil causes little or no hardpan and is actually less violent than a tiller when hitting rocks, tree roots, etc. 

Absolutely unbeatable for breaking new ground and excellent for turning in standing cover crop up to 4 feet tall.  (A shear blade at the top of the rotor keeps material from “winding” around the shaft).  Exploiting the side discharge nature of this tool (which will throw soil up to 24 inches past the edge of the hood and flat-topped raised beds, power ridging and hilling can be achieved.  It makes a good trencher, too.  Depth can be regulated by a gauge wheel (included) and discharge can be controlled by a removable side flap (included) and by adjusting the top cover height.

The Berta Rotating Plough will work on Grillo walk-behind tractors that have at least 8.5 hp (petrol) or 7 hp (diesel) and 4x10x18” wheels or larger. Distance between wheels needs to be 14” to 18”(measured from the inside of one wheel to the inside of the other), and the closer you get to 18”, the better the plough will perform because it takes a bigger bite. Axle extensions may be required to achieve optimal working width on wheels.

(Thanks to EarthTools for this explanation!)

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