~ 
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.) 
TaspLe 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. 08 pats) 
averaged.| 1914 1915 1916 | Average. 
Early fall plowed: Winter wheat...........---..---- 1 0 6.4 1.8 2.7 
Late fall plowed: Winter wheat ..........-..-------- 1 0 7.0 0 ES 
Simimenrctilled] 386 ee ee a Bee eee eee 1 0 5.3 4.0 Sak 
Average of all 3 plats.....--. SS Sai es ee ee oc | ae 6.2 1.9 2.7 
SUMMARY OF YIELDS AND DIGEST oF Cost. 
Tillage treatment. Previous 
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). 
Yield of grain: 
1 A ae ee eS Sr eR A a Sk eae ee as OS oe bushels. - 0 0 0 0 
TREY GN See Se oe Be a eS care anne ee ea tn do.. 6.4 7.0 5.3 6.7 
1916. So. SCRE AS. eRe ee Tp Fo se- en ee Be do.. 1.8 0 4.0 9 
IASVCTARG othe Soe oe Sica Nee ns ee 2.7 2.3 3.1 2.5 
Crop value, cost, etc.: | 
AYE 15 (ead an ey i aR NE Tal a PY dee Deo Ms NF $1.89 | - $1.61 $2. Bia)PS eae es 
COSEIS 2 S38 sek SOME YEE ey eee Peas: eee. eee 6.32 5.65 1OSG4 || see See 
RTORTOLIOSS. Aes ES Se Se ee a eee —4. 43 —4.04 ret oP od |e pen 
