WHEAT PRODUCTION ON DRY LANDS. 39 
Table 21 contains a summary of all the results obtained in the 
tillage experiments with winter wheat at Moro. 
eo oF a 
’ 
Fic. 21._View of a portion of the tillage experiments at Moro, Oreg., in 1922. At left, plat given fre- 
quent cultivation; at right, plat given no cultivation after plowing. The furrows in the plat culti- 
vated frequently are made by the rod weeder. 
TaBLeE 21.—Summary of yields of Turkey winter wheat obtained in tillage experiments at 
Moro, Oreg., conducted on spring and summer plowing in nine years, 1913 to 1921, and 
on fall plowing in eight years, 1914 to 1921, inclusive. 
Yields per acre under different methods of cultivating summer fallow 1 (bushels). 
Date of plowing. | | - 
‘ .. ver- 
| a! 2 3 4 5 6 7 | 8 9 10 age.2 
2 Ot AM ee Se ee ee Ss 
Spring plowing: | 
April 1 (early)....- fe 2 |. 206d) 29-6.) 27: 31294) B01 | 28 sa4ln al 31-1} 32.2|. 29.4 
Mbit (rite... | 27.5 : 28.4 | 28.6-|.2#d 
Summer plowing: 
a a a en eee ee ee 
i . r ‘ " my ’ 
June 1 (early).....-| 27.3| 22.4 28.3) 226) 229| 228) 22.5) 286] 21.7/ 224) 23.1 
Average......... | 27.3| 24.9| 29.1| 25.3] 27.5| 26.6] 25.6| 30.9] 27.1| 27.7| 26.5 
Fall plowing: | | ere 
Early (dry).......- a ee 31.8| 24.9| 29.5] 28.1]....... aes acer? Fees 27.5 
Ss in a a 26.2°| 26.3 |~ 2505 |oo223- 7 Ne aaa a 
Average......... 2. 31.8 | 25.6] 27.9] 26.8 ].2..... 7 a alee oe | 26.8 
Average of all | | | Cal 7 
plowings....... 20% a aes SH Rs rt ee a A ee en eer ee: cee 
1 The methods of cultivation were as follows: 
1, Frequent cuitivation; disked in both fall and spring before plowing; clean summer fallow. 
2. No cultivation of summer fallow after plowing; weeds hoed off before maturity. 
3 and 8. Check plats. Frequent cultivation; disked in the spring before plowing; clean fallow. 
. One harrowing immediately after plowing; no further cultivation; weeds hoed off before maturity. 
. Frequent cultivation; no disking before plowing; clean cultivation of fallow. 
. Frequent cultivation; same as No. 5 except that the crop was harrowed in spring. 
. Packed with subsurface packer after plowing and harrowed once only; weeds hoed off beforematurity. 
. Packed with subsurface packer and frequently cultivated; clean summer fallow. 
10. Packed with surface packer and frequently cultivated; clean summer fallow. 
2 Yields of check plats, all of which were plowed on Apr. 1, are not included in the averages in this column. 
CO m1 Ore 
