18 Nebraska Agricultural Exp. Station , Research Bid. 20 
72 hills long, and the yields have been based on the first 50 hills 
in the row containing, and adjacent to hills having, a full stand 
of plants. All discarded and surplus hills are removed from the 
row, just previous to husking. Error in comparative yields due 
to accidental variation in stand is thus eliminated. 
Wherever varieties or types under comparison were distinctly 
dissimilar in growth habits, three-row plats, rather than single 
rows, have been used to reduce error due to unequal plant com- 
petition in adjoining plats, and the middle row only was used 
for tests. 
After marking the land off crosswise into rows 3.5 feet 
apart by means of a four-row sled marker, the corn was dropped 
into the hills by means of modified hand corn planters from 
which the internal mechanism had been removed. The kernels 
were space planted in the hill about four inches apart in order 
that the number of individual plants in the hill might be deter- 
mined with ease before harvest without confusing suckers and 
main stalks. The customary rate has been three plants per hill. 
The grain yields reported in the following experiments are 
for air-dry shelled corn per acre. Shrinkage and shelling per- 
centages have been determined for each sort, from representative 
samples of ear corn saved in the fall at time of husking. These 
samples, commonly weighing about 30 to 40 pounds, were stored 
in a slightly heated seed house from November till March, when 
the percentages of water loss and of shelled corn were deter- 
mined. 1 
In several instances, grain yields for 1911 do not corre- 
spond exactly with earlier published results for that year. This 
is due to the fact that the earlier published figures have been 
revised for air-dry shelled corn per acre. 
Yield tests of corn resulting from breeding or selection ex- 
periments have always included the original variety, to serve as 
a measure of progress made in the selected stock. Since the 
breeding work has been confined to two varieties, it has been 
relatively simple to continue the original corn year after year, 
without materially altering its hereditary constitution. 
Corn improvement work began with Nebraska White Prize 
corn in 1911. Since then several acres of the original variety 
'An exception to this rule was made with the 1921 crop. Corn ripened 
and cured so abnormally early this year that it graded No. 1 as to moisture 
content when husked. The shrinkage and shelling per cent were determined 
in January. 
