94 BULLETIN 595, U. 8. 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 manuring 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 quan- 
tity available for storage. Im 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.—Yveld and cost of production of winter wheat by different methods at the 
Garden City Freld Station, 1909 to 1916, incluswe. — 
Num- Yield per acre (bushels). 
: ber of 
Treatment and previous Brats a ee kT GS As 
aver- Aver- 
aged. 1909 | 1910 | 1911 | 1912 | 21913] 1914 | 1915 | 1916 age. 
Early fall plowed: Winter 
WINGATE score eee ec ote 1 0 0 0 Ona 6.3} 10.0 0 2.3 
Late fall plowed: Winter 
wiheatin dso sce seers. 1 0 0 0 We Reseee 7.3} 10.0 0 2.5 
Listed: Winter wheat. ...... 3 0 0 OF eee ON eee 8.9] 12.6 2a 3.4 
Subsoiled: Winter wheat... 1 0 0 0 Ott oee: 16.7 9.9 0 3.8 
Disked: a 3 : g 
CORNG eer ch Ace cc tee ae b1 0 0 0 ON eaee ce 8.7| 16.8 0 3.6 
Potatoes ons sae cce ei e Me 3c then lems serial eek sae | Meee ate loeeieece (3) 2 1258 1.2 veal 
Total or average...... 2 0 0 0 (Oh is See 8.0} 14.8 6 3.3 
Green Manured: 
Wath i yerseeen oe Bence c2Q 0 0 0 Oe 16.1 9.0} 10.0 5.0 
Whithipeasssse epee oe di 0 0 0 (OF SGeers ae 14.5] 16.8 2, 5.5 
Total or average. ..... €3 0 0 0 On| Sasceee 15s On elle 9.1 nae 
Summeritillede see fii 0 0 0 UE Baseaes 12.5.) 2153 Tend 5.9 
Average of all 229 plats.....- [epee once 0 0 0 Of seese-e 11.4] 16.7 5.4 4.8 
a Birds destroyed the young wheat plants in the fall, d Four plats, 1909 to 1913, inclusive. 
and the plats were reseeded to spring wheat. e Nine plats, 1909 to 1913, inclusive. 
b Two plats, 1909 to 1913, inclusive. f Two plats, 1909 to 1912, inclusive. 
¢ Five plats, 1909 to 1913, inclusive. 9 Sixteen plats, 1909 to 1912, inclusive; 29 in 1913. 
