348 
Journal of Agricultural Research 
Vol. XXVII, No. 6 
degree of crinkling are indicated in the tables of results by the following 
figures: 
o per cent = none. 
20 per cent=very light. 
40 per cent— light. 
60 per cent = medium. 
80 per cent—heavy. 
100 per cent = very heavy. 
EXPERIMENTAL RESULTS 
EXPERIMENTS WITH COMMERCIAL FERTILIZERS IN 1914 
The experiments in 1914 were preliminary. Nine plats of 1 square 
rod each, separated from each other by 3-foot alleys, were laid out 
on fairly light Hempstead clay loam on University Farm, St. Paul. Acid 
phosphate, at the rate of 480 pounds per acre, was added to three of 
these plats; sodium nitrate was added to three others at the rate of 360 
pounds per acre; and three remained untreated as controls. Three varie¬ 
ties of wheat were sown, one on each of the square-rod plats to which the 
same fertilizer had been applied. These varieties were Glyndon Fife, 
C. I. 2873/ a hard red spring wheat, which is susceptible to stem rust in 
the field in Minnesota; Iumillo, C. I. 1736, a very resistant durum, and a 
moderately resistant selection from a durum-common cross. The seed 
was sown late and a heavy epidemic of stem rust developed. 
As will be seen from Table II, the amount of stem rust which devel¬ 
oped on the same variety in the different plats varied very slightly. On 
Glyndon Fife, the range was from 80 to 85 per cent; on Iumillo, it was 
from 15 to 20 per cent, and on the hybrid from 35 to 50 per cent. The 
lowest percentage of stem rust on Glyndon Fife was in the plat fertilized 
with acid phosphate, but on Iumillo and the hybrid the highest percentage 
was in the phosphate plats. 
While the results are only indicative, it is quite clear that none of the 
fertilizers had an appreciable effect on the amount of stem rust. There 
was so little leaf rust that no data were obtained on its relative prevalence. 
Table II. —The percentages of stem rust on Glyndon Fife, Iumillo, and durum-common 
hybrid wheat in IQI4, in the commercial fertilizer plats on University Farm, St. Paul, 
Minn. 
Kind and amount of fertilizer in pounds per acre. 
Variety of wheat and percentage of 
stem rust. 
Glyndon 
Fife. 
Iumillo. 
Semiresist- 
ant hybrid. 
Control, none. 
Per cent. 
»S 
80+ 
85 
Per cent. 
15 + 
20— 
20 — 
Per cent. 
35 
50 
35 
Acid phosphate 480. 
Sodium nitrate 160. 
7 Accession number of the Office of Cereal Investigations, U. S. Department of Agriculture. 
