New York Agricultural Experiment Station. 235 



the cortland experiment. 



Conducted by G. H. Hyde, Cortland, N. Y. A field of eight 

 acres was sprayed four times — seven and one-third acres single- 

 sprayed and two-thirds of an acre double-sprayed. A strip of 

 three unsprayed rows separated the single-sprayed portion of the 

 field from the double-sprayed portion. The bordeaux (6-6-60 

 formula) was applied with a one-horse, four-row " Watson " 

 sprayer carrying two nozzles per row. Paris green was used with 

 the bordeaux in the first two sprayings. It was also used on the 

 check rows twice, with water. Before the end of the season the 

 unsprayed rows became quite conspicuous owing to their inferior 

 condition due, chiefly, to the ravages of flea beetles. The spraying 

 cheeked the flea beetles considerably. There was no blight and 

 very little tip burn. 



The expense account contained the following items : 



200 lbs. copper sulphate @ 5V2 cts $11 00 



200 lbs. lime 1 40 



24 lbs. paris green @ 21 cts 5 04 



24 hrs. labor for man and horse @ 30 cts 7 20 



Wear of sprayer 6 00 



Total ipso 64 



Expense per acre for four single-sprayings, $3.54. 



Expense per acre for four double-sprayings, $7.08. 



The test rows (400 x 3 ft.) yielded as follows: 



One double-sprayed row, 339 lbs.= 205.1 bu. per acre. 



One single-sprayed row, 271 lbs.= 164 bu. per acre. 



One check row, 144.6 bu. per acre. 



Gain from double-spraying, 60.5 bu. per acre. 



Gain from single-spraying, 19.4 bu. per acre. 



Potatoes being worth 60 cts. per bushel, 19.4 bu. would have a 

 value of $11.64. Subtracting from this the expense of single- 

 spraying, $3.54 per acre, there remains a net profit of $8.10 per 

 acre. Similarly, 60.5 bushels would be worth $36.30 from which 

 there must be deducted $7.08, leaving a net profit of $29.22 per 

 acre for double-spraying. 



