WORK OF THE SAN ANTONIO EXPERIMENT FARM IN 1912. 11 
Tasie I1.—Average yields per acre of crops in the rotation erperiments, San 
“Antonio Haperiment Farm, 19122. 
| Yield in 1912. 
Average 
‘ yield, 1907 aT = = 
ey to 1911, | Number . ee 
inclusive. of plats. Average. | Highest. | Lowest. 
QTM a rar si Se Scie, ey ante ea) s bushels. . 14.6 26 34.1 42.3 24.3 
income Orversee oe See in ke pee eS COG keeles eee 5 40.0 52.0 O24 
(QV NES:, (Ea WA Sy eee ee OWS sad 6.5 10 26.75 37.0 19.1 
CAD OI Lh ees ee ae elf pounds. . 585.3 25 621.5 818.0 448.0 
Sorghum: 
ENSTU TROYONE, ob RSH ey aa ele ere a eee a tons. . 4. 86 5 4.03 4.28 3.82 
SSM MRO S As ee ogee Se eR TT ee hk Se dosese 2.06 3 4.68 5.49 | 4.16 
\DAUISS, LINEN YZ AE eS Se ae doses . 83 4 2. 82 3.09 | 73 533 
1 No oat yields in 1907 and 1908. 2 Seed cotton. 3’ Sorghum not planted in 8-inch drills in 1908. 
MANURING. 
The effect of barnyard manure on crop yields in the rotations was 
more noticeable this year than ever before. The average yield of 
corn from all plats where manure was applied at some time during 
the course of the rotation was shghtly greater than the average of 
corn plats in corresponding rotations not manured. The same was 
true of cotton, but manuring decreased the yield of oats for grain 
very noticeably. The oats on plats which had been manured grew 
very rank and lodged much more than on plats which had not been 
manured. The excessive vegetative growth and consequent lodging 
probably account largely for the decreased yield of grain. 
While the results indicate the value of barnyard manure, the dif- 
ference in favor of manure is much less on crops grown in a rotation 
than where grown continuously on the same land and manured each 
year. (See figs. 3 and 4.) 
Table III gives the yields for 1912 and the average yields for 
1910, 1911, and 1912 of crops grown continuously on the same land 
manured + each year compared with plats not manured. 
TABLE III.—Yield” for 1912 and average yields for 1910, 1911, and 1912 of 
crops on manured and unmanured plats planted continuously to the same 
crops at the San Antonio E.rperiment Farm. 
; Ae Lae : Difference in fa- 
Manured. Not manured. vor of manuring. 
Crop. l i a ty: 
Average Average ; 
{O10 to, | 1912. | 1910 to" | tie, | T9009 | aor, 
1912. 1912. oa 
Orns, 2 =. ede CABS Ooo ete eR are Rea les et ae 15.9 30.5 11.6 26. 6 4.3 3.9 
Co TRIS OOM 8 id Date Sa Pa ge D2R OME ome ao 32 vival eects creep gee 19.5 
(OHRID ooo ae cla ete a a a 455.3 072.0 397.3 474.0 58. 0 98. 0 
1 The manure is applied at the rate of about 15 tons per acre. 
2Corn and milo in bushels per acre; cotton in pounds of seed cotton per acre. 
3 The plats from which dwarf milo yields are given had previously been planted to corn for three years. 
[Cir. 120] : 
a= 
