WORK OF THE SAN ANTONIO EXPERIMENT FARM IN 1912. 



11 



Table II. — Arcr(i(>r ijicUlx prr ncrr nf crops in flic lohitioii cdiKriinciits, Saii 



Antonio E.rinrinicnf Fniin. I'.) 12. 



Crop. 



Corn bushels . 



Dwarf milo do 



Oats, grain ' do — 



Cotton 2 pounds. . 



Sorghum: 3 



4 1 foot drills ton.s. 



8-inch drills do 



Oats, hay ' do 



Average 



yield, 1907 



to 1911, 



inclusive. 



14.6 



6.5 

 585.3 



4.86 



2.06 



.83 



Yield in 1912. 



Niunbor 

 of plats. 



26 



5 



10 



25 



5 

 3 

 4 



.\veragp. 



34.1 

 40.0 

 26. 75 

 621.5 



4.03 

 4. 68 

 2.82 



Highest. 



42.3 



52.0 



37.0 



818.0 



4.28 

 5.49 

 .•i09 



Lowest. 



24.3 



32.5 



19.1 



448.0 



3.82 

 4.16 

 2. 53 



1 No oat yields in 1907 and 1908. 2 geed cotton. 3 Sorghum not planted in S-inch drills in 1908. 



MANURING. 



The effect of barnyard manure on crop yields in the rotations Avas 

 more noticeable this year than ever before. The average yield of 

 corn from all plats where manure Avas applied at some time during 

 the course of the rotation was slightly 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 decrea.sed yield of grain. 



While the results indicate the value of barnyard manure, the dif- 

 ference in favor of manure is much less on crops groAvn 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 11)12 and the average yields for 

 lUlO, 1911, and 1012 of crops gi'own continuously on the same land 

 manured ^ each 3'ear compared with plats not manured. 



Table III. — Yield - for ][)l.i and nrcnKjc yields for tniO. 1911. and li)12 of 

 croijx on uuinured and niunaniircd pints phintcd continiKiuslij to the sunic 

 crops lit the San Antonio E-rpcriincnf Farm. 



1 The manure is applied at the rate of about 15 tons per acre. 



2 Corn 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 J 



