Bui. 1180. U. S. Dept. of Agriculture 
Plate XIII. 
Fig. I. — Growth of Cotton with Urea. Field 4, Season of I920. 
At left (1 row), no fertilizer; yield 624 pounds of seed cotton per acre. At right, urea, 1,000 pounds 
4-8-4 fertilizer per acre; 'yield 1,164 pounds of seed cot ion. (Yields are for 1921 season.) 
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Fig. 2.- 
-Growth of Corn 
Phosphate. 
with Ammonium Sulphate 
Field 4, Season of 1920. 
and Ammonium 
At Left, ammonium sulphate. 1,000 pounds 4-13-2 fertilizer per acre: yield 26 bushels. Center 
H row), no fertilizer: yield 16.3 bushels. At right, ammonium phosphate, 1,000 pounds 4-1:5-2 
fertilizer per acre: yield 24.9 bushels 
