SHUTT] NITROGEN-ENRICHMENT OF SOILS 123 
In the second year of growth (1910), the alfalfa on all three plots 
made a very good start and was exceedingly healthy and vigorous 
throughout the season. Although all the yields were good that on the 
uninoculated plot appeared to be somewhat the heaviest, and the results 
at all three cuttings confirm this impression. 
Peas: The plots used for the peas adjoined those of the alfalfa and 
clover series and were of similar soil. The variety was Golden Vine and 
the seeding was at the rate of 3 bushels per acre. 
HILTNER’S CULTURE—PEAS—PLOT EXPERIMENT. 




Yield 
Date of sowing, May 19th; date of cutting, August 3rd. ES 
| Air-dried 
Fresh crop | crop 
| 
LbS ) Oz bss Oz, 
Wninoculateds...25 0238) tedee a eae ete em ama Ne | 54 Ly (eS 13 
Scedinoeulated 4e i) oe aoe nr ARR AS AA eo LAPS 6 
Soleo ula beds a aii ONE es rey eee nett ioe, Mere 49 LOW ter? 4 

The largest yield, weighed either green or cured, was from the 
untreated plot, but the differences were not large, indicating that 
inoculation from one cause or another was ineffective. 
INOCULATION WITH SOIL. 
Although the artificially prepared cultures, have, as we have seen, 
repeatedly proved effective in increasing the yields of legumes, our 
experience in general has shown that more favourable results are to be 
obtained from the use of surface soil taken from a field growing a crop 
of the legume about to be sown. This employment of soil as 
an inoculating material has more particularly given excellent 
results for alfalfa and one striking instance of its value in 
this connection may be quoted. The experiment was carried on 
at the Experimental Station at Lacombe, Northern Alberta, the in- 
oculating soil being obtained from an alfalfa field on the Experimental 
Station at Lethbridge, Southern Alberta. Two plots, side by side, alike 
as to quality and previous cultivation were sown to alfalfa. On one of 
these broadcast application of the inoculating soil was made, the 
dressing being at the rate of 300 pounds per acre, and harrowed in at 
