— 
WHEAT PRODUCTION ON DRY LANDS: Sa 
RESULTS AT MORO. 
Table 18 shows the average yields of winter and of spring wheat 
during the 9-year period from 1913 to 1921, inclusive, grown on 
summer-fallowed land not packed and packed with subsurface and 
surface packers. Both types of packers were used on five different 
_ methods of spring plowing, namely, land plowed early and late in 
the spring and in early summer and plowed shallow and deep in 
the spring. The subsurface packer also was used on two types of 
fallow treatments, clean fallow, or fallow frequently cultivated dur- 
ing the summer, and fallow that was harrowed once and given no 
_ further cultivation. 
-~ The average yields reported in Table 18 are from single tenth- 
acre plats each year. The yields of winter wheat from the April 1 
plowing with clean fallow and the yields of spring wheat from the 
deep plowing with clean fallow are from adjacent plats. The other 
yields reported in Table 18 are from plats not adjacent. The detailed 
results are found in Table 10 and some of the data are shown graphi- 
cally in Figures 17, 18, and 19. 
TABLE 18.—Average yields of winter wheat grown at Moro, Oreg., after summer fallow 
plowed on three different dates and packed with surface and subsurface packers during 
the 9-year period from 1913 to 1921, inclusive, and of spring and winter wheat on shallow 
and deep plowing, clean fallowed and harrowed only once in the same period with 1913 
omitted. 
Yields per acre (bushels). 
Time and depth ofplowing and cultivation of fallow. | 
Not | gar mea Surface 
packed. packed. packed. 
_ Date of plowing: 
April 1 (early spring)— 
i 2 SS ee ee ee oe a oa a1% 31.1 | sy Ji. 
CE TEE LEADS eg a ee eee ee ee 4 (9572 28. bts. asee see 
May 1 (late spring)— noe 
Data WI = orn eS kh oe A reat Se Sek EE oO 2.7 28.4 28.6 
DIRT ATT ne ae ee a ee eh ee ae eee 26.2 25.9) eee 
June 1 (early summer )— | 
les tetas ie ee ee ea OES Ce os Oe en a Sake Sous ce 22.9 | yA ey ae 22,4 
i 0 WU Sts Seale ae ee ee ee 22.6 22: 55| S35 eee 
oo EL BL. a S85 lS eee RE ei eee ee eee eee 26.4 2623"\22 eee 
Depth of plowing: SSS SSS SSS 
Shallow— 
Clio (atc A a es a oe eee 20.6 21.2 22,2 
“CELE DE Petr ie ee SR Se ee ne 19.5 19, 83 [e3 ee oe 
lin ee eer ee es 21.6 23.7 | 24.9 
Pree UUIERTEE SS ee 5 a Mc ae ie a wn ersten amsiesiaie be dee Se 20.6 | 20.6. jase ee 
JSUT es fae ee 20. 5 7 Re: tel ea ae eet 
It will be noted from Table 18 that the average yield of Turkey 
winter wheat on the different dates of plowing and the methods of 
cultivating the summer fallow were practically identical for the 
plats not packed and those packed with the subsurface packer. 
_ There was a slight increase in yield from the surface-packed plats 
_ when compared with those not packed or those packed with the sub- 
surface packer, but the increase was too slight in each case to be 
significant if the check-plat yields as reported in Table 10 are taken 
into consideration. : 
