FIELD EXPERIMENTS WITH FERTILIZERS. LOyy 
developed to affect the growth. ‘The growth of tubercles was 
small on all of the plots to which soil was applied, but no 
tubercles were found on plots to which no soil was added. 
The tubercles developed on the roots near the surface and 
seemed to show that the soil from the 1894 soy bean field had 
not been applied early enough to thoroughly inoculate the soil 
and allow the tubercles to develop sufficiently to materially 
affect the growth. On the whole, the yields where the addi- 
tional soil was used were not materially different from those 
where no soil was added. This is probably due to the fact 
that the tubercles did not make sufficient growth to influence 
the acquisition of nitrogen. 
SOIL THST EXPERIMENT BY THE STATION. 
This experiment is. the sixth in a series planned as a rotation 
soil test experiment, the same fertilizers being used on the 
same plots year after year. Beginning with 1890 the crops 
grown on this field have been corn, potatoes, oats, cow peas, 
corn, and potatoes. 
ARRANGEMENT ‘OF PLOTS IN STATION EXPERIMENT, 
UNMANURED STRIPS SEPARATE THE PLOTS. 


























RAST. 
PLOT Oo. ELOTo.. 
PLor A. ne PLOT Be eae: | 
PLOr-B: PLOT OOo. 
PLOr C; PLOT'G, 
: ELOT, OO, | PLOT AE: 
: 6 
% paces a 
: i Pior E. PLoT D. 4 
Zz Por: F. PLOT 00. rs 
Pro G, PLoT C. | 
PLOT 000. Prot B; 
EPLor x: Prot A. 
Pye Ya PLOT 0; 
WEST. wa 
The field slopes gently to the south, but not enough to cause 
serious washing. ‘The soil is a heavy loam, and the subsoil is 
a yellow, clay loam. In 1889 it was noticed that the soil 
