258 



Journal of Agricultural Research 



Vol. XV, No. 4 



Table IV. — Comparison of average yield, in bushels per acre, for four one-fortieth-acre 

 plots {approximate size) with no border rows removed, with one border row removed froin 

 either side of each plot, and with two border rows removed frotn either side of each plot for 

 II varieties of oats, 5 varieties of wheat, and 4 varieties of barley 



Crop and variety. 



Descriptive 



note (time of 



maturity 



or type). 



No border rows 

 removed. 



II 



One border row 

 removed. 



•aS 



Two border rows 

 removed. 



OATS. 



Victory 



Minota « 



Silver mine . . . . 



Banner 



Lincoln 



O. A. C. 72 



Iowa 103 



Swedish Select . 



Kherson 



White Tartar . . 

 O. A.C.3 



Average. . 



Medium 



Medium early 



Medium 



Medium 



Medium 



Medium 



Early 



Medium 



Early 



Late 



Early 



99.42 

 87. II 

 85.68 

 82.16 

 80. 71 

 80.53 

 79-47 

 75-80 

 73- 40 

 70.97 

 70.40 



. 69±i. 12 

 •47±o. 59 

 . 45±o. 82 

 . Sgii. 40 

 . 65±i. 35 

 . l7±o. 52 

 . 46±i. 06 

 . 5i±i-o8 

 . 59±o. 44 

 . 49±o. 60 

 - 64±I. II 



88. 90 

 77. 00 

 7S. 00 

 74-46 

 72.77 

 73-87 

 74- 19 

 69.23 

 67-47 

 65.49 

 65-90 



J. 8o±i. IS 

 [-54±o. 37 



!. 91 ±0. 69 



;. 96±i. 42 

 ;. i4±i- 23 

 !.38±o. 57 

 !. 5I±o. 84 

 i-46±o. 83 

 [. 50±o. 41 

 1- 56±o. 37 

 \- 89±i. 17 



S8-57 

 77- 06 

 75-64 

 72.82 

 70. 01 

 71.99 

 73-66 

 66-55 

 65. 10 

 62. 00 

 64-33 



So. 51 



3-82± 



73-57 



3-42± 



Marquis.. . 

 Preston . . . 

 Glyndon . . 

 Arnautka. 

 Acme 



■vulgare. . 

 ■vulgare . . 

 vulgare . . 

 Durum. 

 Durum. 



37-3° 

 36.49 

 30.82 

 29-59 

 28.44 



.58±I-39 



2. 78±o. 66 



3. 55 ±0.85 

 2. 70±o. 64 

 3- 59±o-86 



33-41 

 31-58 

 27-43 

 27. 60 

 26. 20 



.6s±o. 15 

 I. 8o±o. 43 

 3. 7o±o. 88 

 2.05±o. 50 

 3. 09±o. 74 



Average. 



32-53 



2. 64± 



29-24 



2.46± 



BAiaEY. 



Manchuria 



Chevalier 



Manchuria X Man- 

 churia 



Manchuria X Man 

 churia 



Six-row. . 

 Two-row. 



Six-row . 

 Six-row . 



63-99 

 52.92 



SI- 8s 

 47.72 



. 59±o. 14 

 I. 5O±0.36 



I. 68±o. 40 

 .44±o. II 



47.60 

 48-15 



45.60 



41-64 



.65^0.15 

 I- 77i:0. 42 



• 69±o. 16 

 . 23±o. 05 



Average. 



i-05± 



.S4± 



71-37 



31.69 



25- 74 

 25-94 



43-89 

 46-33 



42.81 

 38-45 



42.89 



3- 5o±o- 83 



1. i3±o. 27 



3. 20±0. 76 



5. 90±i. 41 

 5. 37±i-28 



2. 77±o. 66 



2. 99±0. 71 



3. 84±o. 92 

 2.48±o. 68 

 l-59±o. 38 

 5-34±o-27 



3-47± 



.3l±o. 07 



1. 38±o.33 

 3. 47 ±0.83 



2. 27±o. 54 



3. 01 ±0. 72 



2. 09± 



l-37±o-33 

 1. 3i±o. 31 



. i4±o. 03 

 .66±o. 16 



.87± 



o Minota is a selection made at the Minnesota Experiment Station. 



As shown in Table IV, the average standard deviations for the yields of 

 the different varieties of oats, wheat, and barley in the tests with no border 

 rows removed are somewhat greater in each instance than those for the 

 tests with two border rows removed. This suggests the possibility that 

 the probable error for a single determination of yields secured from a 

 single variety grown in plots of a given size may in some instances be 

 greater than the probable error of yields of the same plots after the re- 

 moval of marginal areas 12 inches in width. 



From the data submitted it seems fair to conclude that the extent 

 of the increase in yield of wheat, oats, and barley grown in plots sur- 

 rounded by alleys depends upon the size and shape of the plots and that 

 the removal of the plants occupying an area at least 12 inches wide 

 within the margins of plots removes alley effect and makes yields more 

 nearly comparable. 



