30 BULLETIN 1094, U. S. DEPARTMENT OF AGRICULTURE. 
third, or one-sixth of the total wheat acreage, might be sown follow- 
ing corn, and the other sixth following miscellaneous crops, chiefly — 
grain and forage sorghums. The greatest cultural problem in terms 
of acres involved, consequently, is how to prepare wheat stubble for | 
wheat. } . 
Results of experiments in methods of wheat production conducted — 
cooperatively at the Fort Hays branch station are available for the 
14-year period from 1907 to 1920, inclusive. 
During this entire period wheat has been grown continuously after 
wheat by several methods of cultivation. There are 90 days between 
harvest and seeding. Late plowing, 73 days after harvest and 17 
days before seeding, has averaged 10.5 bushels per acre. This is the 
lowest yielding method under trial, but is practically the same as the 
Klis County average of 10.2 bushels for the same period. Early 
plowing, 32 days after harvest and 58 days before seeding, has aver- 
aged 14.6 bushels per care. Early plowing subsoiled has averaged 
17 bushels, and land listed instead of early plowed has averaged 17.3 
bushels. Land alternately fallowed and cropped to wheat has aver- 
aged 20.3 bushels. 
During the 7-year period from 1914 to 1920, inclusive, surprising 
success has attended the growth of wheat sown in wheat stubble 
either disked or uncultivated. This method has averaged higher 
yields than late plowing and nearly as much as early plowing. ~ 
The results of the experiments show the possibility of increasing 
the county average. Land that can be early plowed or listed can 
not be fallowed profitably, although the yield per acre might be 
increased somewhat. Land that can not be prepared early could 
be fallowed more profitably than plowed late and seeded. If free 
from perennial weeds or grasses it could still more profitably be 
seeded in the stubble, with no preparation unless perhaps a double- 
disking. 
Studies of the method of fallow and the length of the fallow season 
show that the effectiveness of fallow is not increased at this station 
by cultivation for a longer period than the growing season of the fallow 
year. The greater part of its benefits may be realized by cultivation 
in the period between harvest and seeding. The essential factor of 
the fallow is the maintenance of a bare surface, prevention of the 
growth of vegetation. The cultural methods by which this is accom- 
plished are of minor importance from the standpoint of resultant 
yield. Their importance is in their relative cost and their effective- 
ness in preventing soil blowing. 
Green manures, although more expensive, do not increase yields 
over bare fallow or even over early plowing of land from which a 
crop is harvested. 
