Abstract
We tested the relation of the various shapes of garden tractor lugs and their draft on the clay loam soil under three conditions as (a) well packed, dry soil, (b) well packed, wet soil, (c) loose freshly pulverized soil.
Height of lugs Soil condition
a b c
Spade lug 1 1/4″ 174kg 200kg 160kg
2 1/8″ 200 217 172
3 7/16″ 228 254 200
Angle lug 1 1/4″ 187 179 162
2 3/8″ 214 207 173
The result may be summarized as follows.
(1) Increasing the height of lugs, increased the drawber pull, as table I.
Trble I. Draft of garden tractor at 20% slip
(2) Decreasing the angle of lugs, increased the drawbar pull under these conditions, but if the space between the lugs filled with soil, difference of angle of lugs did not affect the drawbar pull.
(3) The 32 ane 40 tooth lugs were nearly same draft at 1 1/4″ height spade and angle lugs.
(4) Extension angle lugs were effective to in crease the drawber pull under these conditions.
