: 
im 
2 
WHEAT PRODUCTION ON DRY LANDS. 37 
_ TasBLe 19.—Annual and average yields of wheat after fallow, packed and not packed, on 
land plowed on three different dates during the 4-year period from 1918 to 1921, inclusive, 
at Lind, Wash 
Yields per acre (bushels). 
Date of plowing and subsequent treatment. 
1918 1919 | 1920 1921 Average. 
March (early spring): 
DEST A ee eee Se eee 6.3 12.7 9.1 16, 2 eit 
" ri da TERE eG oe eS A ee Ne Sear ee ee 6.1 11,2 8.7 13. 2 9.8 
te spring): 
: ied «Ee ae ae ee ee 6.3 14.3 9.0 15.2 1102 
“Tip 7 RGRTG Coe ee a eee eee 5.9 12.0 8.1 15.0 10. 2 
June (early summer): | 
CREP) 2-6 dee Sate Oar Posen once aoe ee! 12.3 8.5 120% 9.8 
i DF TUDES Ree os ae cae ee See 5.8 13.8 8.6 12.8 10. 2 
Despite the possible benefits from using the packer shown by these 
data, its practical use is doubtful. Weeds grow more rapidly and 
ha more work for their control on packed soil; and especially on 
light soil types, where the packer is most beneficial, this additional 
stirring is likely to cause soil drifting by the wind. That the packer 
has not come into more general use would tend to cast doubt at least 
on its feasibility. 
HARROWING AND WEEDING SUMMER FALLOW. 
Experiments to determine the value of frequency of cultivation of 
summer fallow after plowing were conducted at Moro, Lind, and 
Nephi. At Moro three methods were tried: (1) No cultivation of the 
summer fallow after plowing; (2) one harrowing immediately after 
plowing and no cultivation thereafter; and (3) two harrowings im- 
mediately after plowing, with sufficient cultivation with a spike- 
tooth harrow or rod weeder during the summer to keep the ground 
free from weeds. A well-tilled fallowed field at the Sherman County 
Branch Station is shown in Figure 20. Plats in the tillage series 
treated in each of these three ways are shown in Figures 21 and 22. 
At Lind two methods of handling fallow were tried: (1) Immediate 
cultivation after plowing and (2) delayed cultivation, in either case 
the fallow being kept clean of weeds. At Nephi, no cultivation; 
moderate cultivation, and frequent cultivation of the fallow also 
were tested. At all three stations each method of cultivating the 
fallow was used on different dates or methods of plowing. 
RESULTS AT MORO. 
_ At the Moro station the three methods of cultivating fallow were 
tried on three dates of spring and summer plowing, namely, April 1, 
May 1, and June 1. Two methods were tried on four kinds of fall 
plowing, namely, early and late with the disk and early and late with 
the moldboard plow. 
The results obtained, as summarized in Table 20, are in favor of 
frequent cultivation of the summer fallow for winter wheat except 
on the June plowing. In this instance the ground was dry when 
plowed, and cultivation of any kind apparently was of no value. On 
early spring-plowed fallow at Moro cultivation significantly increased 
ee cee yields but only slightly increased the yields of spring 
wheat. 
