BULLETIN 151, U. S. DEPARTMENT OF AGRICULTURE. 
YIELDS OBTAINED. 
Table I gives the yields of various crops from the plats cropped 
biennially, as compared with the yields of the same crops on plats 
cropped annually, and the average yields of the various crops' from 
all plats planted to each crop in the rotation experiments. The aver- 
age yields are obtained by considering all of the plats in the rotation 
experiments and should be fairly representative of results from good 
farming in that region. 
Table I. — Crop yields from plats cropped biennially, as compared with plats cropped 
annually and with all plats used for these crops in the rotation experiments. 1 
Biennial 
cropping. 
Average of all rota- 
tion plats. 
• Year and crop. 
Annual 
cropping. 
Actual. 
Percentage 
of annual 
Y"ield. 
Number of 
plats 
cropping. 
averaged. 
1911. 
Corn 
Cotton 
Oats 
...bushels.. 
...pounds.. 
3.2 
318.0 
10.1 
59.2 
71.3 
160.5 
5.4 
446.0 
6.3 
10.6 
4S3.0 
8.5 
29 
25 
11 
1912. 
Corn 
Col i on 
Oats 
1913. 
...bushels.. 
...pounds.. 
...bushels.. 
24.7 
448.0 
37.0 
92.9 
94.6 
181.5 
26.6 
474.0 
20.4 
34.1 
621.5 
26.75 
26 
25 
10 
Corn 
Cot ton 
Oats 
AVERAGE, 1911-1913. 
...bushels.. 
...pounds.. 
...bushels.. 
30.7 
350.0 
3S.0 
92.8 
53. 9 
369.0 
33.1 
508.0 
10.3 
34.9 
560.1 
11.7 
21 
30 
9 
Corn 
. . .bushels. . 
...pounds.. 
19.5 
372.0 
2S.4 
89.9 
78.2 
231.0 
21.7 
476. 
12.3 
26.5 
554.9 
15.7 
Oats 
i The rotation experiments are conducted on 82 quarter-acre plats. They include continuous cropping, 
biennial cropping, and 2-year, 3-year, and 4-year rotations, combined with various tillage methods, manur- 
ing, and green manuring. In general, it would be expected that the average yields in these experiments 
would be larger than those obtained from the continuously cropped plats. 
It is shown in Table I that in no instance has cotton or corn yielded 
as much on biennially cropped as on annually cropped land. The 
average yields of cotton and corn on all the rotation plats have been 
higher than those secured from either biennial cropping or annual 
cropping, indicating that neither fallowing nor continuous cropping 
for corn and cotton is to be recommended as a general practice under 
San Antonio conditions. 
On the other hand, winter oats on land biennially cropped have 
consistently yielded higher than where planted annually on the 
same land and higher than the average from all oat plats in the 
rotation experiments. 
VEGETATIVE GROWTH OF CROPS ON FALLOWED LAND. 
It has been observed during the past two years that during the 
greater part of the growing period oats made a less rank growth on 
the fallowed plat than on the plats in the rotation experiments. 
