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- 



