22 BULLETIN 595, U. S. DEPARTMENT OF AGRICULTURE, 
At the Akron station the highest average yield, 23.1 bushels per 
acre, has been obtained from summer tillage. The yields from 
summer tillage have been higher than from any other method each 
year except in 1914, when the yield on disked corn ground was 0.7 
bushel higher. Disked corn ground, with an average of 19.7 bushels, 
has given the next highest yield. The average after rye as a green- 
manure crop is 0.3 bushel less than that on disked corn ground, while 
the average after peas is 5.5 bushels less. The yield after peas every 
year has been lower than afterrye. The yield after peas is no greater 
than from some of the continuous-cropping methods. There is very 
little difference in the average yields from early fall plowing, late fall 
plowing, and listing. Subsoiling has given the lowest average yield. 
Disked corn ground has given the highest net returns, $9.54 per 
acre, almost double the profit from listing, the next most profitable 
of the continuous-cropping methods. The profit from disked corn 
ground exceeds that from summer tillage by $4.01. Late fall plowing, 
while averaging slightly less in yield, has given somewhat higher net 
returns than early fall plowing, because it is a cheaper method. Sub- 
soiling has been the least profitable of the continuous-cropping 
methods. The only loss sustained is $2.20 per acre from green 
manuring. ~ This loss is due entirely to the peas, which show a loss of 
$5.65, whereas rye has averaged a profit of $1.12 per acre. 
HAYS FIELD STATION. 
» The soil on which the experimental work has been conducted at 
the station at Hays, Kans., is a heavy silt loam. It can carry a large 
quantity of water available to a crop. Penetration to the lower 
depths, however, is slow. The very compact zone in the third foot 
offers marked resistance both to the downward passage of water 
and to the development of roots. While the evidence is not as 
complete as might be desired, it appears that the proportion of water 
that can be stored in this soil is somewhat above the average. 
Summer tillage has produced the highest average yield, 22.7 
bushels, of winter wheat at the Hays station, though in 1907,1914, and 
1915 the yields from some of the other methods have exceeded those 
from summer tillage. The next highest average yields, 19.6 and 19.2 
bushels, were obtained from subsoilmg and listing, respectively. 
The average yield of 17.6 bushels from early fall plowing is 6.6 
bushels greater than that from late fall plowing, the yields from the 
former method being larger than from the latter method every year 
except in 1908. Disked corn ground has averaged 2.2 bushels less 
than early fall plowmg and 4.4 bushels more than late fall plowing. 
The yields from green manuring average 5.7 bushels less than for 
summer tillage and are lower than from any of the other methods 
except late fall plowing and disked corn ground. The yields after 
