ATMOSPHERIC-XITROGEX FERTILIZERS. I 
rainfall during the period of approaching maturity. The following 
year was exceedingly wet during the spring and also during August, 
tut a drought during July was very detrimental to the early corn. 
The 1921 season was exceedingly dry the first half of the growing 
period, beginning at the time of planting, but moisture conditions 
were good later. The records scarcely give a true picture of the ex- 
tremely dry conditions during May and June, since several local 
showers which fell at Florence did not touch the experimental 
fields. 
CYANAMID. 
The germination of cotton and corn was not appreciably affected 
under any conditions by applications of cyanamid at not to exceed 
the equivalent of 40 pounds of ammonia per acre. With double 
this quantity there was a distinct retarding, and in instances where 
the moisture was deficient the germination was slightly below nor- 
mal and many of the plants died soon after appearing above the 
surface. Under similar conditions ammonium sulphate and sodium 
nitrate also produced bad effects, but to a lesser extent. 
The early growth with cyanamid was decidedly different from that 
with any of the other materials used. For about one or two weeks 
in the case of corn and three to five weeks with cotton the plants 
were retarded and usually made no better growth than on the check 
plats receiving no nitrogen. The larger the application the greater 
the amount of retardation. With both crops, especially cotton, the 
plants became an unusually dark green, the color persisting until 
maturity. During the first and third years, when moisture was 
deficient, cyanamid at the larger rates of application produced a 
marked burning of the leaves. Where side applications were made, 
a similar burning was observed after these late applications but dis- 
appeared shortly after rain fell. 
The later growth of corn showed a rapid recovery from any initial 
injuries, and usually there was no appreciable difference between the 
cyanamid, ammonium-sulphate, and sodium-nitrate plats. With 
cotton the results were frequently very strikingly different. For 
instance, during the season of 1919 when cyanamid was used in 
mixture with acid phosphate, approximately two months were re- 
quired for any increase in growth even with the smallest application. 
The characteristic dark-green color was early in evidence. The first 
plants to show increased growth were those receiving the smallest 
applications of nitrogen. This peculiar behavior was undoubtedly 
due to the high content of dicyanodiamid which formed from the 
cyanamid in the presence of acid phosphate. During the season of 
1920 and 1921 where the cyanamid was either mixed with basic 
phosphates or applied separately with acid phosphate the observa- 
tions were quite different, as shown by Plate I, Figures 1 and 2. 
There was always a retarding period of two to four weeks, which was 
nearly always overcome. However, the material was not as satis- 
factory a nitrogen carrier for cotton as either sodium nitrate or 
ammonium sulphate. 
The time of maturity of corn was not appreciably affected by the 
various cyanamid treatments. With cotton, however, the early 
retarding effects were never entirely overcome, and as a result the 
plants usually did not grow quite as large or the bolls mature as 
