New York Agricultural Experiment Station, 



119 



the season of 1903, cooperated with five farmers in making experi- 

 ments designed to determine the net profit in spraying potatoes 

 in different ways under ordinary farm conditions. 



SUMMARY OF RESULTS OBTAINED IN TEN-YEAR 



EXPERIMENTS IN 1902. 



Table I. — Yield by Series at Geneva in 1902. 



Gain due to spraying three times p8y^ bushels per acre. 

 Gain due to spraying seven times 12^1/2 bushels per acre. 



Table II. — Yield by Series at Riverhead in 1902. 



Gain due to spraying three times ^7% bushels per acre. 

 Gain due to spraying seven times 45 bushels per acre. 



DETAILS OF TEN-YEAR EXPERIMENTS IN 1903. 



FITTING, PLANTING, CULTIVATION, ETC. 



At Geneva. — The land used was a thinly seeded clover sod. It 

 was plowed May 21, 1903. Owing to severe drought the growth 

 of clover was light; and the soil, being a heavy clay loam, turned 



up in large, dry, hard lumps which were difficult to pulverize. 



On May 25 it was fitted by going over it four times with a spring 



