1921.] 



Effect of Chalk on Heavy Land. 



421 



has already been applied 9 years and is still lightening the 

 work to this extent it has obviously saved a considerable amount 



Table II. — Measurements for cross-plo ay king Land already ploughed in Autumn. 

 CorlcHlnitt J^lougli, Austin Tractor. 



A vcrage. 



Unclialhcd. 



1 



Chalked, 

 20 loads fine chalk. 



Chalked, 

 50 loivds ''dug " chalk. 





Centre 



S.E. 



Centre 



S.E. 



Centre 



S.E. 





plot. 



plot. 



plot. 



plot. 



plot. 



plot. 



Miles per hour 



] 2-14 



2-21 



2-50 



2-27 



2-27 



1-88 



Draught per plough. 















lb 



516 



509 



465 



446 



483 



417 



Per sq. in. in furrow 















section, lb. 



i 7-37 



712 



6-63 



6-37 



6-90 



5-95 



Drawbar pull, lb. ... 



1 1,548 



i 



1,527 



1,395 



1,.337 



1,450 



1,250 



Ransome Plough, Austin Tractor. 



Miles per hour 



1-98 





2-15 





22-7 





Draught per plough, 















lb 



537 





467 





483 





Per sq. in. in furrow, 















section, lb. 



! 7-67 





6-67 





6-90 





Drawbar pull, lb. ... 



' 1,610 





1,400 





1,450 





Depth of ploughing, 7 inches. 



Average of all results. 



Unchalked. Chalked. 



Miles per hour 2-11 2-22 



Draught per plough, lb 521 461 



Per sq. in. in furrow section, lb. ... ... 7-o9 6*57 



Drawbar ])Uil, lb 1.5C)2 l.HSO 



in labour and will now save a great deal in the tractor. If it was 

 desirable to apply chalk in the old horse days, it has become much 

 more important to do so now, when every pound of drawbar pull 

 has to be paid for and every fraction of a mile per hour additional 

 speed means so much money saved. It is probably not too much 

 to say that the liming or chalking of heavy land should be 

 regarded as one of the essential factors in the use of the tractor. 

 The difference becomes even more striking when a heavier 

 tractor is used with the heavy plough, as would often happen in 

 autumn and winter work. For comparison with the corres- 

 ponding columns in Table II. the following figures are given. 



Ransome Plough u.'ifh Titan Tractor. 



Unchalked. 20 loads chalk. 



Centre plot. Centre plot. 



Miles per hour 123 I Hl 



Draught per plough, lb (i08 4 7.^ 



Per sq. in. in furrow section, lb. ... S-6S r)-7S 



Drawbar pull, lb !,825 1.125 



A part of this difference is due to the heavier weight of the 

 Kansome plough, but the greater portion can be attributed to 



