28 BULLETIN 1481,-U. 8. DEPARTMENT OF AGRICULTURE 
potash at a number of different points in the Piedmont Plateau and 
the Coastal Plain sections. Experiments to determine the best time 
of applying nitrogenous fertilizers, principally nitrate of soda, to the 
growing oat plant in the spring also were conducted at four stations 
in Georgia. 
COMPLETE FERTILIZERS 
In 28 experiments with winter oats, conducted on 7 different soils 
of the Piedmont Plateau, and 35 experiments on 11 different soils of 
the Coastal Plain, acid phosphate and muriate of potash were applied 
before sowing, and ammonium sulphate was applied in the early 
spring from February 15 to March 15, depending on the location in 
the State. The average yields obtained from these fertilizer treat- 
ments for the two sections of the State are given in Table 17. 
Fiac. 9.—Fall-sown oats grown on plot with no fertilizer (at left); fall-sown oats grown on plot 
treated with acid phosphate and ammonium sulphate applied at the rates of 400 and 140 pounds 
per acre, respectively (at right) 
TaBLE 17.—Summarized average yields of winter oats obtained from 28 experi- 
ments on the Piedmont Plateau and 35 experiments on the Coastal Plain, where 
acid phosphate was applied with ammonium sulphate alone or with both am- 
monium sulphate and muriate of potash 
Acre yields (bushels) 
Fertilizer application 
Piedmont Coastal 
Plateau Plain 
INO fer ili Zen ee eae a NN A ie ee seal. Baca eaumpeee Eek | 11.3 10.2 
400 pounds of acid phosphate and 140 pounds of ammonium sulphate____-___----- 23.0 15.9 
400 pounds of acid phosphate, 140 pounds of ammonium sulphate, and 100 pounds bce nan 
of muriate:of potash__-=__2-- See Rete ee ee ee eee eee 
The use of acid phosphate and ammonium sulphate on the average 
more than doubled the yield of oats on the Piedmont Plateau, and on 
et ct aetna att ite tin renin a> atts Sa 
