8 



BULLETIN 511, U. S. DEPARTMENT OF AGRICLTLTURE. 



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 cotton: 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, l-horsc 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 V. — Relation of depth of plowing to acre yields of cotton. 





Depth of plowing. 



■d 



Areas. 



3 inches'. 



4 inche.i. 



6 inchas. 



6 inches. 



7 inches. 



8 inches. 



9 inches. 



[3 



»3 



"3 



a 





S 





a 



"3 



Farms. 

 Yield. 



1 





a 



Ph 



2 



2 

 ® 



Delta area 



2 

 1 



IS 

 22 



Lbs. 



1,350 

 500 

 642 

 620 



23 

 33 

 25 



47 



Lb.f. 



1, 135 

 792 

 736 

 601 



15 

 40 

 35 

 24 



Lbs. 



1, 140 

 817 

 697 

 620 



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 

 916 

 6.50 





 14 

 

 



Lbs. 

 



896 

 

 



Lbs. 

 1,117 



South Atlantic division. . 



Intermediate area.s 



Southwestern division. . . 



8.54 

 714 

 617 



Total 



Average 



43 



3,112 128 



778 t 



3,264 

 816 



114 3,274 



1 S19 



98 



3,122 

 780 



2S 3, .300 

 1 82.'; 



50 



3,5'16 



886 



14 



8C6 

 S90 























