EXPEKIMENTS WITH FALLOW IN MONTANA 
RESULTS WITH CORN ON FALLOW AND WITH CONTINUOUS CROP- 
PING 
Four plats are cropped to corn continuously. One is on 4-inch 
spring plowing, one on 8-inch fall plowing, one on 8-inch fall plow- 
ing with subsoiling to a depth of 18 inches for 1917, 1919, and 1920, 
and one on spring listing. Another plat of corn is grown each year 
on fallow. This requires two plats, one in fallow and one in corn. 
The yields .of these five plats for the seven years from 1917 to 
1923, inclusive, are shown in Table 4. The yields given are the total 
pounds per acre of grain and stover. Some grain is produced in 
most years, but the grain is often immature, owing to drought. In 
1918 and 1923 all plats produced good grain, but to make the differ- 
ent years comparable the yields are given as the totals. Corn as it 
is grown in this locality at the present time is a feed for farm con- 
sumption and is fed largely as fodder. 
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Fig. 4.— Average yields of corn on fallow and with four methods of continuous cropping to corn for the 
7-year period from 1917 to 1923, inclusive 
The average yield of corn after fallow was 4,199 pounds, which 
was 848 pounds more than that of continuous corn on spring plow- 
ing. Spring plowing was the highest yielding of the tillage methods 
for continuous corn and showed a decided advantage over all methods 
in 1919. It also showed a higher yield than fall plowing in four of 
the seven years. The average yield from subsoiling was about 100 
pounds more than from 8-inch fall plowing. This difference is small 
and probably within the limits of error in the experiment. Spring 
listing consistently shows the lowest yield of all methods. 
The average yields of corn on fallow and with other methods as 
given in Table 4 are shown graphically in Figure 4. 
Table 4. — Yields of corn on fallow and on land continuously cropped to corn at the 
Assinniboine Field Station, 1917 to 1928, inclusive 
[Yields are the total weight of grain and stover] 
Yields per acre (pounds) 
Previous crop and tillage 
1917 
1918 
1919 
1920 
1921 
1922 
1923 
Aver- 
age 
3,340 
2,040 
1,020 
1,160 
680 
3,730 
3,760 
3,750 
3,210 
1,130 
1,140 
1,750 
930 
980 
240 
5,800 
4,800 
3,700 
4,700 
2,700 
4,900 
3,250 
3,520 
3,530 
2,360 
4,800 
2,750 
3,000 
3,250 
450 
5,680 
5,110 
5,170 
4,980 
3,940 
4,199 
Continuous, on spring plowing 
3,351 
3,013 
Continuous, on fall subsoiling 
3,116 
1,643 
