New York Agricultural Experiment Station. 397 



ONE HUNDRED GALLONS OF BORDEAUX MIXTURE PER 

 ACRE VS. FIFTY GALLONS PER ACRE. 



The following experiment was conducted on the farm of Mr. 

 H. L, Hallock, near Jamesport, N. Y.: 



Seven rows, 636 feet in length, were planted with potatoes of 

 the variety White Elephant. Considerable care was taken ti- 

 apply the fertilizer uniformly over the seven rows and to cut the 

 seed potatoes in such a way as to leave two eyes to each piece. 

 They were planted with a potato-planter. This was on land 

 which had grown corn the previous season. 



During the season they were sprayed five times with Bordeaux 

 mixture, Paris green being added in the first two sprayings. The 

 dates of spraying were June 9, June 22, July 8, July 22 and 

 August 6. The Bordeaux mixture was applied with a Hudson 

 Special Bordeaux Sprayer, a cut of which may be seen in Fig. 

 11. This sprayer is arranged to spray four rows at a time with 

 two nozzles to each row, so that in going across the field and back 

 again eight rows are sprayed. But instead of spraying eight 

 rows we sprayed only seven and were thus enabled to double 

 spray the center row; in other words, the center row received at 

 each spraying exactly twice as much Bordeaux mixture as each 

 of the other six rows. Since the sprayer applies Bordeaux mix- 

 ture at the rate of abo'ut 50 gallons per acre, the six single 

 sprayed rows received Bordeaux mixture at the rate of 50 gal- 

 lons per acre and the double sprayed row or center row at the 

 rate of 100 gallons per acre. 



At digging time the tubers on the center row were weighed by 

 themselves. The tubers on the other six rows were also weighed. 



The double sprayed row yielded 430^ lbs. mechantable tubers, 



35 lbs. culls. 

 The six single-sprayed rows averaged SdOi; lbs. merchantable 



tubers, 52| lbs. culls per row. 

 Difference in yield of merchantable tubers, 40 lbs. per row or 15 



bu. 13 lbs. per acre. 



