32 
BULLETIN 1180, U. S. DEPARTMENT OE AGRICULTURE. 
ammonium sulphate, and it is believed that the materials are of 
about equal value as nitrogen carriers. The early responses are 
shown in Plate XI, Figure 2, and Plate XII, Figures 1 and 2. 
Table 16. — Yields per acre of cotton from Sections I and II of field No. 3 in 1920 and 
1921. 
Treatment. 
Section I: 
No fertilizer 
No nitrogen 
Ammonium sulphate 
No fertilizer 
No nitrogen 
Ammonium chlorid 
No fertilizer 
No nitrogen 
Double salt 
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 nitrogen (acid phosphate) 
Nonitrogen (calcined phosphate) 1 
No fertilizer 
No nitrogen (calcium phosphate) 
Cyanamid (with calcined phos- 
phate) x 
Fertilizer 
ratio. 
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 
O-O-O 
0-8-4 
2-8-4 
4-8-4 
8-8-4 
0-5-4 
2-5-4 
2-5-4 
0-10-4 
2-7-1 
4-10-4 
0-0-0 
0-13-4 
4-13-4 
4-13-4 
0-0-0 
0-8-4 
0-8-4 
O-O-O 
2-8-4 
4-8-4 
8-8-4 
Plat. 
Yields of seed cotton (pounds). 
Actual. 
355 
170 
538 
562 
850 
1,045 
1,250 
170 
305 
562 
723 
1,230 
1,125 
1,088 
230 
723 
498 
1,050 
1,075 
1,218 
1,008 
1,050 
805 
643 
943 
1,125 
388 
1,048 
1,223 
1,425 
388 
668 
633 
388 
393 
633 
513 
793 
835 
715 
Aver- 
age. 
263 
850 
1,045 
1,250 
238 
1,230 
1,125 
1,088 
1,050 
1,075 
1,218 
1,008 
1,050 
805 
643 
943 
1,125 
1,048 
1,223 
1,425 
60S 
033 
391 
573 
793 
835 
715 
In- 
crease 
over 
check. 
300 
495 
700 
Actual. 
587 
482 
445 
439 
464 
607 
42 
-203 
Aver- 
age. 
300 
482 
175 
377 
280 
245 
268 
122 
540 
440 
833 
1,018 
1,080 
123 
120 
440 
508 
948 
783 
715 
120 
165 | 
508 
458 
763 
925 
1,083 
745 
735 
553 
300 
608 
868 
108 
620 
890 
958 
483 
433 
220 
262 
142 
288 
433 
505 
618 
655 
568 
018 
665 
508 
In- 
crease 
over 
check. 
195 
490 
833 
1,018 
1,080 
343 
528 
590 
122 
474 
948 
783 
715 
474 
309 
241 
143 
483 
763 
925 
1,083 
280 
442 
600 
745 
735 
553 
"""-io 
-192 
300 
608 
868 
308 
568 
108 
620 
890 
958 
270 
338 
108 
483 
433 
375 
325 
198 
469 
149 
186 
99 
1 Basic slag was substituted for calcined phosphate in 1921. 
Cyanamid gave low yields in both years and was not as satis- 
factory a fertilizer as any of the other materials. The plants were 
very green but failed to grow rapidly or form large numbers of bolls. 
Nitrification was probably slow in this heavy soil and dicyanodiamid 
production was favored. It is believed that the poor yields with 
cyanamid can not be attributed to the use of basic slag or calcined 
phosphate. 
