New York AGRICULTURAL EXPERIMENT STATION. 91 
tenths of an acre each season. The rows sprayed every two 
weeks alternate with those sprayed only three times and with 
others not sprayed at all. For further details see Bulletin 221. 
Supplementary to the above experiments, the Station has con- 
ducted a series of business experiments similar to those made in 
1903.1. Under direction of the Station, fourteen farmers in 
different parts of the State have carried on experiments designed 
to determine the net profit in spraying potatoes in different ways 
under ordinary farm conditions. 
A third line of effort has been the collection of the results of 
numerous volunteer potato-spraying experiments made by farm- 
ers. Forty-one such experiments are reported in this bulletin. 
The most important feature of these experiments, as a whole, is 
the increase in yield due to spraying. However, nearly every one 
of them contains other points of interest. 
SUMMARY OF RESULTS OBTAINED IN TEN-YEAR EXPERIMENTS 
IN 1902.? 
TABLE I.—YIELD BY SERIES AT GENEVA IN 1902. 


(SS SS EE SE I TE LDL LLL LEAL LIAS 
SERIES. Rows. Dates of spraying. Yield per acre. 
| Bu. lbs. 
1 Lea Redewt hy Sorters Oe EE a eB eae July.10, 23 and Aup, 12.4, 3.00.00 3 317 41 
Gea ie sh bos oy 2, 5; )8;and:14. i052 .% June 25, July 10, 23, 30, Aug. 12, 26 
ANC SODAS LOs ee etente cc ee elec 342 36 
PIN oS op aise Phas 3,.6; 9 and 15,....%+% Notisprayed (ieek, chine iebavan 219 4 
Gain due to spraying three times, 984 bu. per acre. 
Gain due to spraying seven times, 1234 bu. per acre. 
: TasLeE II.—Yre.p By Series AT RIVERHEAD IN 1902. 
SERIES. Rows. Dates of spraying. Yield per acre. 
she al IE lbs, 
Mase ea edt ol ec: 245, Band dbx. shan: May 26, June 20 and July 12...... 295 20 
i esis Aika sk ena eee Peat Zand Oe ccnera May 26, June 3, 20, 30, July 11, 23 
- TD AIS rats eR coe AR 312 30 
87 hee ah er 3; 620 and a2 stor... Not. BDrayGd Laer iy. sees es Os 267 40 

BIE LS EE SE LL TE ALE I A AR IT Te EA ELLER LEED DELLA LLL DOLE AG ELA GELLER EE | 
Gain due to spraying three times, 273 bu. per acre. 
Gain due to spraying seven times, 45 bu. per acre. 
1For an account of the business experiments conducted in 1903 see Bulletin 
241 of this Station, pp. 267-285. 
*¥For details of the experiments in 1902 see Bulletin 221 of this Station. 
