‘ 
NEw York AGRICULTURAL EXPERIMENT STATION. 69 
The Station ten-year experiments were begun in 1902. Each 
year there are two of them — one on the Station grounds at Geneva, 
the other near Riverhead, Long Island. The object of these experi- 
ments is to determine how much the yield can be increased, on the 
average, by spraying with bordeaux mixture. Two methods of 
spraying are being compared as to their efficiency: Some rows are 
sprayed regularly every two weeks while others are sprayed only 
three times during the season. The rows sprayed every two weeks 
alternate with those sprayed only three times and with others not 
sprayed at all, so that every third row is an unsprayed one. 
The farmers’ business experiments were begun in 1903 and have 
been continued each year since. The object of these experiments 
is to determine the net profit in spraying potatoes in different 
ways under actual farm conditions. In 1906, fifteen farmers 
cooperated with the Station in making business experiments. 
The collection and tabulation of the results of volunteer ex- 
periments made by farmers all over the State was begun in 1904. 
Sixty-two such experiments made in 1906 are reported in this 
bulletin. While the most important feature of the volunteer 
experiments, taken as a whole, is the increase in yield due to 
spraying, several of them contain, also, other points of special 
interest. 
Bulletins previously published are as follows: 
No. 221. Potato Spraying Experiments in 1902; 
No. 241. Potato Spraying Experiments in 1903; 
No. 264. Potato Spraying Experiments in 1904; 
No. 279. Potato Spraying Experiments in 1905. 
SUMMARY OF RESULTS OBTAINED IN TEN-YEAR 
EXPERIMENTS PRIOR TO 1906. . 
RESULTS IN 1902. 
TABLE I.—YIELD BY SERIES AT GENEVA IN 1902.’ 



Series. Rows. Dates of spraying. Yield per acre. 
1% ; Bu. lbs. 
10 ie ed ee ae A Atmeand: Lota a. Alias LU Aes Van Chest Oe LD cat ews eras ens 317 41 
eee sre Aro me and Lasoo ss Une oO pull ys Ono, GUs aa bo 26 
ANG soeOt ys LOL det bes tame Megan ae 36 
LEDLNS 2 Serpe aly Mea BLOy GAATICs LOL Phe NOL ASTSTA VEC clit. ts sie en eet mein | 219 4 
| 
! 

1 Rows 10, 11 and 12 omitted because of probable error. 
Gain due to spraying three times, 98% bu. per acre. 
Gain due to spraying seven times, 123% bu. per acre. 
