28 BULLETIN 595, U. S. DEPARTMENT OF AGRICULTURE, 
summer tillage, is 3.5 bushels greater than the lowest average yield, 
7.1 bushels, on disked corn ground. 
In 1908, 1914, and 1915 all methods except that of green manuring 
produced profitable yields, and in 1912 there was a profit on disked 
corn ground. With these exceptions none of the methods have been 
profitable. As an average for the eight years green manuring, summer 
tillage, and subsoiling have shown losses of $8.36, $3.22, and $1.29, 
respectively, while listing, disked corn ground, early fall plowing, 
and late fall plowing have shown profits of 92, 72, 47, and 23 cents, 
respectively. 
TUCUMCARI FIELD STATION. 
The soil at the field station at Tucumcari, N. Mex., is a fine sand. 
Below the third foot the soil type changes to a loam and then to a 
clay. The soil drifts quite readily. ; 
During the three years that winter wheat has been grown at this 
station the crop was a total failure once. In 1915 and 1916 the 
yields were so small that under no method did the yield of grain 
pay the cost of production. Drought at critical periods and soil 
blowing are the chief unfavorable factors. (Table XVII.) 
Taste XVII.— Yields and cost of production of winter wheat by different methods at the 
Tucumcari Field Station, 1914 to 1916, inclusive. 
Yield per acre (bushels). 
Number 
Treatment and previous crop. QBS. SS SSS 
averaged.| 914 1915 1916 | Average. 
Early fall plowed: Winter wheat.........-.-.----.-- 1 0 6.4 1.8 2a, 
Late fall plowed: Winter wheat ........-...--------- 1 0 7.0 0 2.3 
Sumdmertibled sic. ss aces ere ie etaiettermeersiae wore eeinire 1 0 5.3 4.0 3.1 
VGH (011 CHILGITD) BY ines a aeeadee Hoong soemeeder o6t bec HeHeae Gates sbeer 6.2 1.9 250 
SUMMARY OF YIELDS AND DIGEST OF COST. 
P Previous 
Tillage treatment. crop. 
Yield, values, etc. (average per acre). 
Early fall | Late fall | Summer | Winter 
plowed | plowed tilled wheat 
(1 plat). | (1 plat). | (1 plat). | (2 plats). 
wet of grain: 
Be Senses Bee aes SSS ce See ne aan oh bushels 0 0 0 0 
1915 See oe re Home cee et coc c mince pce 3-5 seeeense do.. 6.4 7.0 G8} 6.7 
LOL Gores eins 5 Pe Sos ee DBE CIENTS See do.. 1.8 0 4.0 -9 
PAST CIAL O ele ae n Ne asia cle woe Sten ale cies. «cee mae cs 2.7 2.3 Sei 2.5 
Crop yas cost, etc.: 
NVGIID GY See Be OR ae OO Ses eee eee GA ae $1.89 $1.61 $2217)| 2 sees ae 
Cost. SAC Saitee See ee nee Geek ase ee 3 li) SSR g. SERRE 6.32 5.65 HO..645)2 22 22235- 
IBTOR POT LOSS eee oe eee es ae. Se ee —4.43 —4.04 8.47 ses eas 
