I 
SPRING WHEAT IN THE GREAT PLAINS AREA. 15 
The results of only two years are available for study from the 
Huntley station. Both were years of good to heavy production, but 
years when production was determined to a considerable degree by 
the amount of water stored in the soil at seeding time. There was 
consequently rather sharp response to those methods that start a 
crop with more available soil water than others. 
The highest average yield, 25.9 bushels per acre, has been obtained 
from summer tillage. The next highest yield, 24.1 bushels, has been 
from the use of peas as green manure. Disked corn ground with a 
yield of 22.4 bushels has been better than corn ground plowed either 
in fall or spring. The data on the effects of fall and spring plowing 
of either corn ground, wheat, or oat stubble being rather contradic- 
tory and inconsistent among themselves, are hardly sufficient to admit 
the drawing of conclusions. Indications are that marked differences 
are not to be expected. The same lack of significant difference 
exists between the yields from listing and plowing. The yields from 
subsoiled land have just equalled those from land similarly treated 
in every way except subsoiling. Green manure, on the average, was 
productive of yields intermediate between those on summer-tilled 
ground and those on cropped ground. The crop raised in 1913 where 
peas were plowed under was much superior to that raised where barley 
was plowed under. In 1914 there was little difference between the 
crop after peas and that after winter rye. 
Wheat has been produced at a profit by all methods. The greatest 
profit, SI 0.93 per acre, has come from disked corn land. This is due 
both to high yield and low cost of preparation. Between fall plowing, 
spring plowing, and listing there is little difference, the profits from 
them exceeding $3 per acre less than from disked corn ground. Sub- 
soiling, on account of its low yield and higher cost, has reduced the 
profits to $4.03 per acre. The high cost of production on summer 
fallow has overcome the high yield to the extent that the profit from 
it has been somewhat less than that realized from land cropped every 
year. The least profit, $1 per acre, has been from the use of green 
manure. 
WILLISTON FIELD STATION. 
The experimental work at the Williston Field Station, in North 
Dakota, is conducted on a silt soil that carries a considerable propor- 
tion of available water and on which the depth of feeding is limited 
only by the depth to which the character of the crop limits its devel- 
opment of roots. 
The results of five years are available for study from Williston 
station. The production for two of these years was very heavy, the 
average yield from all plats in 1912 being the highest yet recorded 
in this work. The year 1913 was one of good but not excessive 
85751°— Bull. 214—15 3 
