6 BULLETIN- 133, U. S. DEPARTMENT OF AGRICULTURE. 
harrowed at the same time. In the spring of 1911 the land .was pre- 
pared for seeding by harrowing and leveling. The wheat was seeded 
on March 31. On Series VII, which had not been irrigated the pre- 
ceding fall, the soil was very dry at planting time in the spring of 1911 
and the grain was very slow to germinate. After the rains, which 
came during the latter part of April, however, the grain came up 
promptly and a good stand was secured on both series. 
The wheat plats in the two series were irrigated uniformly twice 
during the season of 1911. No differences were noted in the time 
of maturity of the wheat on the two series. The crop reached matu- 
rity on August 10. 
In 1911 Series VI was irrigated on September 29 and 30. As soon 
as the soil was sufficiently dry in Series VI both series were plowed to 
a depth of about 7 inches. They were left in a rough condition during 
the winter. It is believed that leaving the soil in the rough condition 
had the effect of preventing much of the soil drifting which commonly 
occurs when the soil is left in a finely pulverized state during the win- 
ter months. As previously stated, the total precipitation from October 
1, 1911, to April 1, 1912, was 3.59 inches, which was more than that 
which fell during the corresponding period in either the preceding or 
the following year. This relatively high precipitation left the soil on 
the series not irrigated in the fall in better condition at spring planting 
time in 1912 than at the corresponding time in 1911. When spring 
operations were begun in 1912, the surface soil on both series was in 
excellent condition for receiving the seed, and it was expected that 
there would be little, if any, difference in the yields obtained on the two 
series during that year. The two series were double-disked, harrowed, 
and leveled preparatory to seeding, and the wheat was planted on April 
10. Uniform treatment was applied to the two series as in 1911. 
Both series were irrigated twice. No difference was noted in the 
time of maturity of the wheat on the two series. The crop on all 
the plats ripened August 2. 
In 1912 Series VI was irrigated on September 29 and 30. As soon 
as the soil was sufficiently dry in Series VI both series were plowed 
and left in a rough condition over winter. The preparation for plant- 
ing in the spring of 1913 was the same as that in 1912. The wheat 
was planted on April 4. The soil was in good condition at the time of 
planting and copious rains in April resulted in a uniform germination 
of the grain on all the plats. The irrigation and other treatments 
subsequent to planting were uniform on both series during the growing 
season. Both series were irrigated twice. All the wheat ripened 
about the same time, July 30. 
The numbers of the plats, the height of the wheat at maturity, the 
yields of straw and of grain, and the number of pounds of straw accom- 
