94 BULLETIN 595, U. S. DEPARTMENT OF AGRICULTURE, 
and somewhat larger than from early fall plowing. The practicability 
of the method of using disked corn ground depends on the value of 
the corn crop. Late fall plowing, on account of the poor yields 
obtained from this method, shows the lowest profit, while summer 
tillage, on account of the cost of the method, has given next to the 
lowest profit. The yields from green manurig have not been 
sufficient to pay the cost of production by this method. 
GARDEN CITY FIELD STATION. 
The work at Garden City, Kans., is on a high upland. The soil 
is a light silt loam. With the exception of the accumulated humus 
near the surface, it is practically uniform to a depth of at least 15 
feet. The development of roots is limited only by the depth to 
which water is available and by the physiological character of the 
crop. The light character of the soil, however, makes it possible to 
store in each unit of it only a comparatively small quantity of water. 
This is not entirely overcome by the depth of the soil. The results 
in storing water have been determined largely by the limited yuan- 
tity available for storage. In no year under any method practiced 
has the soil been filled with water to as great a depth as it is possible 
for the crop’to develop roots and use available water. (Table XIV.) 
TaBLE XIV.—Yield and cost of production of winter wheat by different methods at the 
Garden City Field Station, 1909 to 1916, inclusive. 
Num- Yield per acre (bushels). 
Treatment and previous Ee 
ae aver- | y999 | 1910 | 1911 | 1912 |1913| 1914 | 1915 | 1916 | AVE 
aged. age. 
Early fall plowed: Winter 
Wiheat hee cy. eee ee ee 1 0 0 0 Oats 6.3 | 10.0 0 2.3 
Late fall plowed: Winter 
WIRGA Gap ae od CaN ee 1 0 0 0 O) | Sen-es- 7.3 | 10.0 0 25 
Listed: Winter wheat. .....- 3 0 0 0 QO. [420 5%5: 8.9} 12.6 PA 3.4 
Subsoiled: Winter wheat. . . 1 0 0 0 (UR GAasee 16.7 9.9 0 3.8 
Disked: | : 
Worm se: Saas es b1 0 0 0 Ou) Seok: 8.7} 16.8 0 3.6 
Ota OCS Meroe Spee oeeseas 1d Sessa ol BREE |e oe no betel b eaocee 4:3 12.8 ee (a! 
Total or average. -.-.-. 2 0 0 0 ORS -mee 8.0] 14.8 .6 3.3 
Green manured: 
Wathinygests 92-22: ee c2 0 0 0 (08 e egomaes 16.1 9.0} 10.0 5.0 
Wiathipeass ieee eee dl 0 0 0 0: 2a 14.5 16.8 152, 5.5 
Total or average. .--.- €3 0 0 0 Os|ste2toe 1555 |) V6 geil 5.2 
Summer tilled...........--- fil 0 0 0 eae 12,5 | 21.3| 7.7 5.9 
Average of all 229 plats.....-|.-...... 0 0 0 il sgersigee 11.4} 16.7 5.4 4.8 
a Birds destroyed the young wheat plants in the fall, 
and the plats were reseeded to spring wheat. 
b Two plats, 1909 to 1913, inclusive. 
¢ Five plats, 1909 to 1913, inclusive. 
d Four plats, 1909 to 1913, inclusive. 
e Nine plats, 1909 to 1913, inclusive. 
Ft Two plats, 1909 to 1912, inclusive. 
9 Sixteen plats, 1909 to 1912, inclusive; 29 in 1913. 
