June is, 1925 Effect of Crops on Yields of Succeeding Crops in Rotation 1117 
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Fig. 6.—Plan of Field II, showing the arrangement and dimensions of plots and intervening 
spaces, the fertilizer treatments, and the cropping system 
Table VI: — Comparative productiveness of the cropping units of Field II as indi¬ 
cated by the average yields of tobacco and wheat on the control plots for the period 
1915 to 1923, inclusive 
Location of plot 
Tobacco 
Wheat 
Yields of leaf, per 
acre 
Yields of stalks, per 
acre 
Yields of grain, per 
acre 
Yields of straw, per 
acje 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Section A. 
Section B.. 
Section C_ 
Lbs . 
756 
745 
719 
Lbs. 
853 
763 
640 
Lbs. 
880 
895 
952 
' Lbs. 
408 
421 
407 
Lbs. 
488 
429 
368 
Lbs. 
497 
449 
545 
Bush. 
7.5 
9.3 
7.0 
Bush. 
9.4 
10.3 
8.6 
Bush. 
12.0 
13.8 
12.0 
Lbs . 
870 
975 
773 
Lbs . 
1,058 
1,255 
975 
Lbs. 
1,245 
1,410 
1,240 
Table VII. — Comparative productiveness of the cropping units of Field III as 
indicated by the average yields of tobacco anih wheat on the control plots for the 
period 1916 to 1922 
Location of plot 
Tobacco 
Wheat 
Yields of leaf, per 
acre 
Yields of stalks, per 
acre 
Yields of grain, per 
acre 
Yields of straw, per 
acre 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Plot 13 
Plot 8 
Plot 3 
Section A. 
Section B. 
Section C. 
Lbs. 
1,076 
931 
844 
Lbs. 
1,122 
906 
859 
Lbs. 
1,082 
973 
Lbs. 
626 
469 
445 
Lbs. 
698 
466 
465 
Lbs. 
604 
458 
397 
Bush. 
9.4 
7.7 
10.0 
Bush. 
9.8 
8.7 
9.7 
1 Bush. 
10.8 
9.8 
10.5 
Lbs. 
1,225 
1,299 
1,317 
Lbs. 
1,344 
1,216 
1,363 
I 
Lbs. 
1,545 
1,592 
1,476 
