A REPORT ON TEE SAMPLING OF CORN FIELDS
Walter ~. Hendricks,
Results of an analysis of data on the sampling of corn fields,
.obtained by the Agric\utural Adjustment Administrationl/.
are given in this
Individual fields were sampled by selecting 4-hil1 blocks in a
systematic manner which may be described briefly as follows:
The sampler proceeded along the side of the field to a point between
24 and 25 rows from one corner. at'which point he entered the field to a point
between 24 and 25 rows from the side of the field and selected a ~hi11
of which two hills were on "row 24 and two'were on row 25.
were taken by continuing across ·the field. and taking a ~hi11
row until the opposite side of the
field was reached.
The sampler then proceeded do"m the side of the field for
the same' ciistanc('Md ·begari.taking samples while crossing the field in the
opposite directio~~' Thi~was
continued until tho entire field was s~~p1ed •
The four'hi11s -in each block were consid.ered to be two samples of two
hills each and the ears of corn on each'2-hi11
saulp1e within a block were
weighed as a unit. all weights being expressed in pounds •
The data for five of the fieldS sampled in<I11inois were used in the
An analysis of variance was obtained to determine the extent
of the average variability between blocks in the same field and between 2-hi1l
samples in the same block.
The data yielded. 491 degrees of freedom for esti-
mating the variance between blocks ~~d 496 degrees of freedom for estimating
the variance between 2-hi11 samples within blocks.
The average variance
between blocks in the same field was 0.74118 while the 'variance between 2-hi11
samples within blocks was only 0.43024.
The aver~ge weight of the corn on a
2-hi11 sample was 3.04 pounds, from which it is evident that the