Oct. 28, i9i8 Experiments in Field Technic in Plot Tests 



255 



The results for oats, wheat, and barley indicate that in plots sur- 

 rounded by alleys the effect of the additional space extends to the plants 

 occupying areas 12 inches within the margins of the plots and possibly 

 farther. The higher yield of the plants in the outside border rows appears 

 to be due to better nutrition, as is indicated by later maturity. 



EXTENT OF INCREASE IN THE YIELD OF PLOTS DUE TO ALLEY EFFECT 



From the foregoing it is obvious that the extent of the increase in the 

 5delds of plots surrounded by alleys depends upon the relative propor- 

 tion of the area of the border strip occupied by plants subject to the effect 

 of the additional space to the total area of the plot. In Table II are sum- 

 marized the percentages (i) of the total areas of plots of diff'erent sizes 

 but of the same shape and (2) of plots of the same size, but varying in 

 shape contained in borders 12 inches wide (a) on two sides of plots only 

 and (b) on the ends and sides of plots. 



Table II. — Relation of a i-foot border within a plot to its total area 



Approximate size of 

 plot (fraction of acre). 



1/440 

 1/220 

 1/220 

 l/lIO 

 l/llO 

 l/lIO 



i/S5- 



1/160 

 1/80. 

 1/80. 

 1/40. 

 1/40. 

 1/40. 

 1/20. 

 1/20. 

 i/io. 

 i/io. 



Dimensions of 

 plot in feet. 



Approxi- 

 mate shape 

 of plot. 



Feet. 



3^33 

 3X66 



6X33 



3X132 



6X66 



12X33 



24X33 



8- 5X33 

 8.5X66 



17.0X33 

 8.5X132 

 17X66 

 34X33 

 17X132 

 34X66 

 34X132 

 68X66 



i: II 

 1:22 



1:5-5 

 1:44 

 i: II 

 1:2.75 

 i:i-375 



1:4 



1:8 



1:2 



1:16 



1:4 



i: I 



1:8 



1:2 



1:4 

 i: I 



Area of 

 plot. 



Sq.ft. 



99.0 



19S. o 



198. o 



396. o 



396.0 



396. o 

 792. o 



280.5 

 561.0 

 561.0 



I, 122. O 

 I, 122. O 



1, 122. O 



2, 244. O 

 2, 244. O 

 4, 488. O 

 4, 488. O 



Area a 



of 



border, 



I foot 



wide 



on sides 



of 



plots 



only. 



Sq.ft. 



64 

 130 



64 

 262 

 130 



64 



64 



64 



130 

 64 

 262 

 130 

 64 

 262 

 130 

 262 

 130 



Percent- 

 age of 

 total area 

 of plot in 

 border, 

 I foot 

 wide on 

 sides of 

 plot only. 



Area Percent- 



of age of 



borders total area 



64.65 

 65.66 



32-32 

 66. 16 

 32-83 

 16. 16 

 8.08 



22. 82 



23- 17 

 II. 41 

 18.89 



11-59 



5-7° 



11.68 



5-79 

 5-84 

 2. 90 



I foot 

 wide 

 on end: 

 and 

 sides 



of 

 plots. 



Sq.ft. 



68 

 134 



74 

 266 

 140 



86 



79 

 145 



96 

 277 

 162 

 130 

 295 

 196 

 328 

 264 



of plot in 

 border, 

 I foot 

 wide on 

 ends and 

 sides of 

 plot. 



68.69 

 67.68 



37-37 

 67. 17 



35- 35 

 21. 72 

 13.89 



28. 16 



25-85 



17. II 



24. 69 



14.44 



11-59 



13- 15 



8.73 



7-31 



5-88 



" In computing the area of a strip 12 inches on the sides of a plot only, 2 square feet, which belong to the 

 end borders, must be deducted from the total area in the two sides strips. 



An examination of the percentages given in Table II shows that the 

 relation of the areas affected by the additional space afforded by alleys 

 to the total area of plots is dependent upon both the shape and the size 

 of the plots. 



