ATMOSPHERIC-XITROGEX FERTILIZERS. 
60 
tween ammonium phosphate and ammoniated superphosphate, using 
ammonium sulphate as a standard, there was a slight difference in 
favor of ammonium phosphate at both rates of application. At the 
smaller rate ammonium phosphate and ammonium sulphate were 
of equal value, but with the larger application ammonium sulphate 
was considerably better, the actual yields from the adjoining plats 
being 1,428 pounds of seed cotton with this material and 1,280 
pounds with ammonium phosphate. Cyanamid gave good results 
cotton: 
SECT/ON U> SECT/ON I. 
CORN 
SECTION JT. SECT/ON 1. 
Fig. 4.— Diagram of field No. 4, located at Muscle Shoals, Ala., showing plat arrangements and treat- 
ments for the season of 1921. The soil type is Decatur silt loam. Three rows per plat with buffer 
row. Size of plats, one-twentieth of an acre. The index figures refer to the number of pounds of 
NH3, P2O5 and K;0 used per acre. Ac. P. = acid phosphate; K = potassium sulphate; Cyan. = cvana- 
mid; Am. CI. = ammonium chlorid; Am. S. = ammonium sulphate; Am. X. = ammonium nitrate; 
Am. P. = ammonium phosphate; Am. Sup. = ammoniated superphosphate; B. Slag = basic slag. 
on this area, the increases over the checks being approximately as 
large as with any other material used. The actual yields were con- 
siderably lower, however, because the soil at this point was very poor. 
At the largest rate of application cyanamid produced injuries and 
delayed growth and maturity to such an extent that the yield was 
less with 80 pounds of the ammonia equivalent than with 40 pounds. 
The plants on the cyanamid plats were a dark green and rather 
small but bushy. The bolls were slightly above the average in size 
and were nor destroyed to as great an extent by the boll weevil as 
were those on adjoining plats. 
