24 BULLETIN 1180, U. S. DEPARTMENT OF AGRICULTURE. 
Table 12. — Yields -per acre of cotton from Section III of field No. 1 in 1920 and 1921. 
Fertilizer ratio. 
Plat. 
Yields of seed cotton (pounds). 
1920 
Actual. 
I In- 
Aver- crease 
Aver- 
age in- 
check. crease - 
1921 
Actual 
Aver- 
age. 
In- 
crease 
over 
check. 
Aver- 
age in- 
crease. 
Series A.— Mixed salt (from 
KC1): 
0-0-0 
0-8-G 
1-8-6 
2-8-6 
4-8-6 
0-8-6 
2-8-6 
4-8-6 
Series B.— Sodium nitrate: > 
O-O-O 
0-8-1 
1-8-4 
2-8-4 
4-8-4 
0-8-4 
2-8-4 
4-8-4 
Series C— Urea: 
0-0-0 
0-8-4 
2-8-4 
4-8-4 
8-8-4 
0-8-4 
2-8-4 
4-8-4 
Series P.— Ammonium sul- 
phate: 
0-0-0 
2-8-4 
2-8-4 
4-8-4 
8-8-4 
0-84 
2-84 
4— S-4 
Series E.— Urea:" 3 *" 
0-0-0 
0-8-4 
2-8-4 
4-8-4 
g g ,} 
0-8-4 
2-8-4 
4-84 
1,076 
664 
996 
1,084 
1,052 
1,240 
1,444 
1,084 
576 
896 
1,096 
392 
788 
824 
900 
1,568 
1,945 
824 
676 
1,068 
628 
628 
860 
1,200 
1,268 
1,744 
2,060 
1,200 
968 
1,084 
1,548 
824 
612 
928 
884 
1,508 
n,120 
2,040 
884 
1,088 
1,320 
1,812 
208 
48 
936 
736 
1,228 
1,340 
1,412 
736 
856 
1,024 
1,356 
870 
1,040 
1,052 
1,240 
1,444 
830 
630 
900 
1,568 
1,945 
716 
676 
1,068 
628 
1,268 
1,744 
2,060 
1,084 
1,548 
718 
906 
1,508 
2,"046' 
1,320 
1,812 
128 
1,228 
1,340 
1,412 
796 
1,024 
1,356 
12 
200 
404 
94 
762 
1,139 
-40 
3o2 
23S 
714 

464 
602 
1,134 
392 
504 
S76 
228 
560 
12 
133 
335 
119 
589 
1,030 
468 
826 
1,134 
310 
532 
576 
580 
632 
920 
768 
972 
1,376 
920 
544 
884 
1,172 
440 
284 
496 
504 
656 
940 
1,260 
504 
528 
636 
364 
468 
460 
844 
896 
1,316 
1,568 
844 
604 
900 
1,220 
536 
452 
668 
672 
1,176 
1,260 
1,564 
672 
676 
1,052 
1,368 
100 
40 
656 
424 
976 
1,044 
1,048 
424 
580 
776 
768 
972 
,376 
732 
884 
,172 
656 
940 
1,260 
516 
636 
652 
896 
1,316 
1,568 
724 
900 
1,220 
670 
1,176 
1,260 
1,564 
674 
1,052 
1,368 
70 
540 
976 
1,044 
1,048 
546 
800 
1.036 
196 
156 
44n 
760 
120 
244 
664 
916 
176 
506 
378 
436 
504 
508 
254 
490 
1 Mixed salt (from K 2 S0 4 ) was substituted for sodium nitrate in 1921. The potash content of the fertilizer 
mixtures containing sodium nitrate was 4 per cent and with the mixed salt 5 per cent. 
» This plat is omitted from the averages because through mistake it received no nitrogen. 
* Calcium nitrate with basic slag was substituted for urea in 1921. 
Results with cotton. — Table 12 gives the yields of seed cotton for the 
two years. These show considerable variations between treatments, 
ammonium sulphate usually giving the largest increases. Sodium 
