238 Report of the Botanical Department of the 



THE OGDENSBTJRG EXPERIMENT. 



Conducted by Andrew Tuck, Ogdensburg, N. Y. About 4.6 

 acres of potatoes were sprayed six times between July 18 and 

 September 4. A one-borse, four-row Aspinwall sprayer was used. 

 One nozzle per row was used in tbe first three sprayings and two 

 nozzles per row in tbe last three. A strip of three unsprayed rows 

 constituted the check. In all six sprayings paris green was used 

 with the bordeaux at the rate of three pounds to fifty gallons. 

 Paris green in water was applied to the check rows three times by 

 means of a sprinkling pot without any apparent injury to the 

 foliage. Four rows on one side of the check were double-sprayed. 

 Some contrast appeared between the check and the sprayed rows 

 due to the check rows being more injured by tip burn, flea beetles 

 and bugs. On the check rows bugs were not as well controlled as 

 they should have been to make the experiment entirely fair. 



The following items appear in the expense account : 



105 lbs. copper sulphate @ 7^^ cts $7 88 



105 lbs. lime 1 10 



60 lbs. paris green @ 25 cts 15 00 



36 hrs. labor for man and horse @ 30 cts 10 80 



Wear of sprayer 1 00 



Total $35 78 



Expense of single-spraying six times, $7.Y8 per acre. 

 Expense of double-spraying six times, $15.56 per acre. 

 The test rows (variety. Green Mountain; 171 x 3 ft.) yielded 

 as follows: 



One double-sprayed row, 138 lbs.= 195.3 bu. per acre. 

 Two single-sprayed rows, 253 lbs.= 179 bu. per acre. 

 One check row, 103 lbs.= 145.8 bu. per acre. 

 Gain from single-spraying, 33.2 bu. per acre. 

 Gain from double-spraying, 49,5 bu. per acre. 

 Market price of potatoes, $1.00 per bushel. 

 "Net profit from single-spraying, $25.42 per acre. 

 !N"et profit from double-spraying, $33.94 per acre. 



