WINTER WHEAT IN THE GREAT PLAINS AREA. oii 
higher yields than any of the other continuous-cropping methods. 
Because of the uniformly high yields secured and because of the low 
cost of preparation, disked corn ground has shown the largest profit 
at all of the stations except at Huntley, where summer tillage shows 
$3.13 more profit, at Hays, where listing and subsoiling have netted 
$1.98 and 18 cents more, respectively, and at Amarillo, where there is 
a difference of 20 cents in favor of listng. At Garden City, where 
none of the methods have been profitable, the smallest loss is from 
disked corn ground, but at Dalhart the loss on disked corn ground 
has been greater than from any of the other methods except green 
manuring and summer tillage. The realization of these profits on 
disked corn ground depends, of course, upon the successful growth of 
corm as a general farm crop in competition with other crops. 
Summer tillage has given the highest average yield of any method 
under trial at all of the stations except North Platte and Archer, 
where both green manuring with rye and disked corn ground have 
averaged higher. As an average for the nine stations at which all 
of the various methods are practiced, the yield from summer tillage 
has been 4.8 bushels more than the yield from disked corn ground, 
the highest yielding of the contimuous-cropping methods, and 3.8 
bushels more than from green manuring. However, at only one 
station, Huntley, has summer tillage shown the greatest profit of 
any of the methods. Summer tillage requires the use of the land two 
years to produce one crop, and an extra amount of cultivation is 
necessary to keep the ground free from weeds during the fallow 
period; consequently, it has the highest acre cost of any method 
under trial except green manuring. Except at Huntley the increase 
in yleld from this method has been more than offset by the increased 
cost of production over the cost of the best contimuous-cropping 
methods. It does, however, show a profit at all but five of the 
stations, and only at Archer and Amarillo has it failed to net a profit 
when any of the other methods have returned a profit. 
Green manuring is the most expensive method under trial. It 
resembles a fallow in that it requires the use of the land for two 
years for the production of one harvested crop, with the added 
expense of seed and seeding. There is a saving in cultivation during 
the spring while the crop is growing, but this is offset by the necessity 
of plowing to turn the crop under and is not sufficient to make up 
for the cost of seed and seeding. Increases in yields have not been 
commensurate with the cost of producing them. At none of the 
stations except Archer and North Platte have the yields following 
any green-manure crop exceeded those from summer tillage. The 
net returns from green manuring have not been as great as from any 
of the other methods at any of the stations. A profit has been 
realized from green manuring at the Judith Basin, Huntley, Ardmore, 
