BULLETIN 157, TJ. S. DEPARTMENT OF AGRICULTURE. 
PLOWING. 
In the plowing experiments at the Nephi substation comparisons 
have been made between, spring and fall plowing; subsoiling, pleep 
plowing, and shallow plowing; also between deep fall plowing followed 
by shallow spring plowing and shallow fall plowing followed by deep 
spring plowing. Most of the experiments have been in progress since 
1908, and enough data are available to warrant a rather full discussion 
at this time. 
Fall and Spring Plowing. 
Since the test of fall and spring plowing was commenced in the 
fall of 1908, four tenth- acre plats have been used, thus permitting 
the practice of alternately cropping and fallowing the plats. The 
use made of each plat in each year since 1908 is shown in Table I. 
Table I. — Use of plats at the Nephi substation for the years 1908 to 1913, inclusive. 
Plat. 
1908 
1909 
1910 
1911 
1912 
1913 
12A... 
J3A... 
15D... 
16D... 
Winter wheat. 
do 
Fallow 
.....do 
Fallow 
do 
Winter wheat. 
do 
Winter wheat. 
do 
Fallow 
do 
Fallow 
do 
Winter wheat. 
do 
Winter wheat. 
do 
Fallow 
do 
Fallow. 
Do. 
Winter wheat. 
Do. 
From 1904 to 1908 the plats were alternately fallowed and cropped 
to winter wheat in the same manner indicated above. During these 
four years all plats received practically uniform treatment, being 
plowed in the fall and allowed to lie until the spring of the following 
year, viien they were double disked and harrowed and then fallowed, 
with normal treatment until seeding time in the fall. 
In the fall of 1908 plat 13A was plowed as usual, while plat 12A 
was not plowed until the spring of 1909. During the summer of 
1909 the plats received uniform treatment. In the fall of 1909 plats 
15D and 16D were segregated as alternates to plats 12A and 13A in 
this experiment. Plat 16D was plowed in the fall and left without 
further cultivation until the following spring. Plat 15D was plowed 
in the spring of 1910. Both plats were fallow during 1910 and 
received the same cultivation. 
It will be noticed that during the last four years each of the plats 
in this test has been fallow two summers and has produced two 
crops of winter wheat, a total of four crops; that each year there have 
been two fallow plats and two cropped plats; that one plat of each 
pair has been plowed in the fall and the other in the spring; and that 
subsequent treatment has been as nearly the same in all cases as 
possible. 
In studying the relative value of spring and fall plowing, moisture 
conservation, yield per acre, and cost of production have been used 
as bases of comparison. 
