s 
BULLETIN 511, U. S. DEPARTMENT OF AGRICULTURE. 
With, reference to the relation of depth of plowing to yield of cotton 
a compilation of the data from all the records taken has been made 
(Table V) . These data show clearly that there is no relation between 
depth of plowing and yield of cotton. However, there may be an 
associated factor, since the depth of plowing for cotton is largely 
governed by the type of soil. The light sandy or loamy soils are 
plowed slightly deeper than the heavy clay soils. It is probable that 
the light soils are plowed deeper than the heavier soils largely because 
Fig. 4.— Some types of tillage implements employed in growing cottdn: 1, Middle buster, or lister; 2, 
Georgia stock with half shovel or turning plow; 3, small solid sweep; 4, Georgia stock with half shovel 
and fender attached for use in barring off; 5, 10-inch heel sweep, or heel scrape; 6, diamond scooter; 7, 
broad shovel; 8, Georgia stock with solid sweep and 18-inch heel sweep attached; 9, 18-inch heel sweep; 
10, Georgia stock with 18-inch solid sweep attached; 11, 1-horse spike-tooth or harrow-tooth cultivator; 
12, cotton hoe; 13, fertilizer distributor; 14, cotton planter. 
a plow will normally run deeper in sand or loam than it will in clay, 
and not because any effort is made to plow the light soils deeper. 
Table A 
r . — Relation of depth of plowing to acre yields of cotton. 
Depth of plowing. 
Areas. 
3 inches. 
4 inches. 
o inches. 
6 inches. 
7 inches. 
8 inches. 
9 inches. 
"3 
*>> 
i 
ft 
"a 
09 
a 
'3 
a 
03 
"3 
09 
a 
u 
C3 
ft 
2 
Farms. 
Yield. 
CD 
a 
(4 
c3 
ft 
2 
a 
g 
ft 
2 
© 
> 
< 
Delta area 
2 
1 
18 
22 
Lbs. 
1,350 
500 
642 
620 
23 
33 
25 
47 
Lbs. 
1,135 
792 
736 
601 
15 
Lbs. 
1 140 
6 
54 
15 
23 
Lbs. 
1,000 
836 
693 
593 
2 
20 
4 
2 
Lbs. 
950 
825 
975 
550 
2 
38 
3 
7 
Lbs. | 
1,000 
980 14 
916 
650 
Lbs. 

*96 


Lbs. 
1,117 
South Atlantic division. . 
Intermediate areas 
Southwestern division. . . 
40 1 817 
35 697 
21 620 
S54 
714 
617 
Total 
43 3.112 128 
3, 264 
816 
114 3,274 
1 819 
98 
3,122 28 3.300 
780 1 - - 1 825 
50 
3,546 
886 
11 806 
. . . V)li 
778 1 — . 
