28 THE WEED FACTOR IX THE CULTIVATION OF CORN. 



Table VII. — Relation of corn-tillage results to soil productivity — Continued. 



Year. 



1910. 



1911. 



1886. 



1889 

 1890 



1891 

 1892 

 1896 



Experimenter. 



Yield of 

 cultiva- 

 ted plat 

 per acre. 



Group 2. — Yields be- 

 ticeen 25 and 60 bush- 

 els per cere— Cont'd. 



George, H. C 



Heuser, W. L 



Huyett, J. B 



Kirkpatrick, L. R 



Lambert, F. L 



Lemmon, R. H 



Perry. J. B 



BatlirT, W. S 



Boss, Henry 



Boyce, Oscar 



Sugar E xper i m e n t 

 Station 



Brant, W. C 



Dailev, S.C 



Day, A. P 



Heuser, W. L 



Huvett, J. B 



Ladd. E. O 



Lemmon, B . H 



Perry. J. B 



Prince. A. H 



Bansom, E. B 



Sevmour, B. R 



Smith. C. S 



U. S. Plant Introduc- 

 tion Garden 



Average. 



Group 3. — Yields 

 more than 50 bushels 

 per acre. 



1890. 



1899 

 1907 



New York experiment 



station (Geneva) 



1888. . Illinois experiment sta- 

 tion 



....do 



....do 



....do 



....do 



....do 



Missouri experiment 

 station 



....do 



South Carolina experi- 

 ment station 



....do 



Cornell experiment 

 station 



Froley, J. W 



Nebraska experiment 

 station 



Purdue experiment 

 station 



55. 4 



33.1 

 38 



58.8 

 26.9 

 53.8 

 39.05 

 33.41 



25.52 



56.8 



93.8 



84.6 

 66.8 

 58.4 

 70.1 

 85.5 



58. 6 

 67.3 



50.3 

 65.3 



61.9 



Yield of 

 unculti- 

 vated 

 plat ex- 

 pressed 

 as per 

 centage 

 of culti- 

 vated. 



47.9 



42.45 



42 



30.9 



49.65 



30.5 



33.5 



38.5 



54.3 



39.7 



57. 'i 



32.24 



90 



82.4 

 69.7 

 68.4 



100 



100 



100.9 



123.9 

 99 



111.2 



114.7 



104.4 

 93.3 

 68.8 



113.9 

 86.1 



127.4 

 81.8 

 85.7 



100 

 92.3 

 82.6 

 95 



. 59 



Year. 



Experimenter. 



Yield of 

 cultiva- 

 ted plat 

 per acre. 



Yield of 

 unculti- 

 vated 

 plat ex- 

 pressed 

 as per- 

 centage 

 of culti- 

 vated. 



1908 



1909 



1911 



Group 3. — Yields 



more than 50 bushels 

 per acre — Cont'd. 



Minnesota experiment 

 station 



Nevr Hampshire ex- 

 periment station 



Purdue experiment 

 station 



Barrett, J. M 



Dimond. O. C 



Lambert, F. L 



Lee. J. J 



Littlejohn, W. D 



McCuhe. Kate B 



Menvin, G. n 



Sawver, B. S 



Wallace. M 



Watson. A. D 



Welch. E. K 



Anderson. W. B 



Brant, W. C 



Case, J. IT 



Dailev. S. C 



Dimond, O. C 



Elmer, E. O 



Fredericks. C. P 



George, II. C 



Goddard. W. B 



nansbarger. D 



Hester, H. C 



Lambert. F. L 



Llovd. F.L 



McCune. Kate B 



Morgan, Geoffrey 



Rector, J. H 



Binehart, N.W 



Welch, E. K 



Williams. D. W 



Winsor, B. E 



Anderson, W. B 



Arlington Experimen- 

 tal Farm 



Dav, A. P 



Dimond. O. C 



Elmer, E. O 



Goddard, W. B 



Housekeeper. G. C 



Huyett, J. B 



Lambert, F. L 



McCulloch. Fred 



Perry, J. B 



Bansom. E. B 



Rector. J. H 



Bushels. 

 62.5 



62.5 

 52.2 

 62.4 

 56.4 

 81.3 

 73.8 



107.4 

 78.4 

 71.3 

 84.9 

 67.4 

 64.2 

 62.6 

 70.3 

 65 



83.1 

 90.6 

 85.6 

 50.14 

 55.4 

 84.9 



105.4 

 74.1 

 55 



63.5 

 65.2 

 98.1 



139.7 



104.6 

 70.5 



106.2 

 72.9 

 74.3 



78.4 

 54.3 

 65 



63.6 

 65 



91.7 

 57.7 

 66.1 

 143.1 

 58.8 

 53.8 

 66.4 



Average. 



100 

 100.4 



123.7 



121.1 



115.3 

 96 

 95.3 



106.3 



100 

 69.1 

 91.9 

 99.1 



109.7 

 99.2 

 95.5 



107.7 

 89.2 

 90.9 



101.8 



106.4 

 90 



93.3 

 99.4 

 84 



100 



101.6 

 92.3 



116.3 

 94.3 

 84.2 



126.2 



100.8 

 89.6 



73.9 

 68.8 

 98.5 



108.4 



106 

 99.1 

 86.1 



100 

 88.8 

 85.7 

 92.3 

 84.5 



98. 34 



SIMPLIFICATION OF WEED CONTROL WHEN THE SOIL IS NOT STIRRED. 



A very interesting observation made during these investigations is 

 that with some of the experiments on certain soils weeds ceased 

 growing on the uncultivated plats sooner than on the cultivated 

 ones, where the number of hoeings and cultivations, respectively, 



257 



