112 REPORT OF 'THE BOTANICAL DEPARTMENT OF THE 
The test rows were dug with a potato digger on October 17. 
The three unsprayed rows and three sprayed rows on either side 
were dug and weighed separately. The yields are shown in the 
accompanying table: 
TABLE X.—SHOWING YIELDS IN West HENRIETTA EXPERIMENT, 
——$<—_——_ _ -_—_— ——— 



YIELD PER Row.!9 YIELD PER ACRE. 
ROW. Treatment. 1 Rep wee: 
Marketable. Culls. | Marketable. Culls. 
Lbs. Lbs. Bu. lbs. | Bu lbs. 
Dp mcts iia e's eheiene os Sprayed 8 times......... 1398 33 | 323 38 vi 38 
Se ecaine Cee Legis Sprayed 8 times......... 1372 26 malate lig 37 6 1 
Ste Sis cana, Sandan Sprayed 8 times......... 1201 SPAT ay be Dont ee 2 
Ah S ehcnteaidiensy’ brs INO BDEAYEd Seite or ets 875 82 | 202 34 | 18 59 
Set he eae NOU SDTAVeG as cee eiteor 798 51°| 184 44) "¥1 48 
Oradea etoile INOtiEDrAVed uit seams 3 850 25 | 196 46 5 A7 
4 Sprayed 8 times......... 1258 | 40 | 291 14 9 16. 
Sieh retin oneetel GODEAVER 1S UIMNCS caps on cree 1347 46 | 311 5010 39 
Oey oie en Sprayed 8 times......... 1222 46 | 282 53 | 10 39: 



The average yield of the three unsprayed rows (Rows 4, 5 and 
6) was 841 pounds or 194 bushels and 41 pounds per acre. The 
average yield of the six adjacent sprayed rows (Rows 1, Vie» Bf 
8 and 9), was 1,29984 pounds, or 300 bushels 52 pounds per acre. 
The gain due to spraying, computed in this way, is 106 bushels 
11 pounds per acre. We believe, however, that this method of 
computing the gain makes it appear less than it really is. The 
outside unsprayed rows 4 and 6 received some benefit from spray 
falling upon them when the adjacent rows 3 and 7 were sprayed. 
And the first sprayed rows 3 and 7 did not have as good a chance 
as other sprayed rows in the same field for two reasons: (1) 
They were not so thoroughly sprayed; (2) they were more ex- 
posed to the attack of blight because they stood next to the badly 
blighted unsprayed rows. This view is supported by the yields.. 
The middle unsprayed row yielded Jess than either of the other 
unsprayed rows; and the first sprayed row on either side yielded 
less than the second sprayed row standing next to it.2° The 
Same thing has been observed in other experiments. Accordingly, 
we hold that the proper method of determining the gain is to. 
compare the yield of the middle unsprayed row 5 with the aver- 
age yield of the two sprayed rows 2 and 8. Computed in this 
way the yield of the sprayed is 314 bushels 43 pounds per acre 
“Rows 1,075 feet long and 35 inches apart, 13.89 being required to make- 
an acre. 
* We are unable to explain why Row 9 yielded less than Row 8. 
