36 BULLETIN 1180, U. S. DEPARTMENT OF AGRICULTURE. 
Table 18. — Yields per acre of cotton from Sections I and II of field No. 4. 
Treatment. 
Ferti- 
lizer 
ratio. 
Plat. 
Yields of seed cotton (pounds). 
Actual. 
Average. 
Increase 
over 
check. 
Section I: 
No fertilizer 
No nitrogen , 
Ammonium sulphate 
No fertilizer 
No nitrogen 
Urea 
No fertilizer 
No nitrogen 
Ammonium chlorid 
No fertilizer 
No nitrogen 
Ammonium nitrate 
Section II: 
No nitrogen 
Ammonium sulphate 
Ammoniated superphosphate 
No nitrogen 
Ammonium phosphate 
Ammoniated superphosphate 
No fertilizer 
No nitrogen 
Ammonium phosphate 
Ammonium sulphate 
No fertilizer 
No nitroeen (acid phosphate). 
No nitrogen (basic slag) 
No fertilizer 
No nitrogen (with basic slag) . 
Cyanamid (with basic slag). . . 
No fertilizer 
No nitrogen 
Ammonium nitrate 
0- 0-0 
0- 8-4 
2- 8-4 
4- 8-4 
8- 8-4 
0- 0-0 
0- 8-4 
2- 8-4 
4- 8-4 
8- 8-4 
0- 0-0 
0- 8-4 
2- 8-4 
4- 8-4 
8- 8-4 
0-0-0 
0- 8-4 
4- 8-4 
8- 8-4 
0-5-4 
2- 5-4 
2- 5-4 
0-10-4 
2- 7-4 
4-10-4 
0- 0-0 
0-13-4 
4-13-4 
4-13-4 
0- 0-0 
0- 8-4 
0- 8-4 
0- 0-0 
0- 8-1 
2- 8-4 
4- 8-4 
8- 8^ 
0-0-0 
0- 8-4 
2- 8-4 
554 
448 
792 
664 
940 
990 
790 
448 
1,040 
664 
1,190 
920 
1,164 
1,330 
1,040 
1,190 
974 
1,510 
1,390 
1,500 
974 
1,380 
1,470 
840 
1,014 
840 
1,010 
1,110 
840 
1,280 
1,428 
580 
840 
694 
580 
694 
304 
840 
1,070 
140 
351 
823 
501 
728 
940 
990 
790 
744 
212 
262 
62 
927 
920 
1,164 
1,330 
1,040 
-7 
237 
403 
1,082 
1,510 
1,390 
1,500 
368 
428 
308 
418 
974 
1,380 
1.470 
840 
406 
496 
1,014 
880 
840 
174 
40 
1,010 
1,110 
580 
170 
270 
840 
1,280 
1,428 
580 
440 
588 
840 
694 
580 
260 
114 
499 
840 
1,070 
9S4 
140 
341 
571 
485 
351 
823 
472 
Results with corn. — The yields of corn for the two years are given 
in Table 19. The results for Section I show good increases with all 
the materials. Urea, double salt, ammonium chlorid, and am- 
monium nitrate gave about as good results as ammonium sulphate. 
The severe weather conditions the second year as well as the natural 
soil variations make slight differences insignificant. 
