14 BULLETIN 1146, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 4.—Yield and composition of tubers from sprayed and unsprayed potato 
plants, ete—Continued. 
Yield Composition of tubers. 
from 
Variety. Treatment. 2 TOWS, 
ieatlan Solids. | Starch. | Nitrogen. 
Late potatoes (October): Pounds. | Per cent. | Per cené. | Per cent. 
Spalding Rose....... 0-4-50 spray (Mo copper)....-..------ 153 19. 36 16. 80 0. 406 
DO? | 9 hes ces Pickering spraye eo aeecie. tes 5243 221 21.48 19. 20 397 
ID OF eee ee eee 44-50 Bordeaux... ...-2..--.-2-2--- 250 Qa eds eae . 430 
DOSES Seen a poet Check @Moicoppen)a-setean 2 ene 248 1OF8Psig sh. Pee! . 409 
Goldi@oine= =~ x.55-- 4-450 Bordealixcr ae. 35. e aes a 242 22. 09 17.00 - 485 
ID Ose aera 0-4-50 spray (no copper) -..-----.---- 232 PALS wal eee Seated 461 
IDO 2s Stick 53 Pickering Sprays. 2 jack sec ee Pee 296 23. 80 17. 90 . 457 
DO see reene tees Check (m0 COppeEyis-5 ees. =-< soe 294 19. 52 14. 50 444 
Trish Cobbl CS) ripe oe 44-50 Bordeaux......-....--------- 303 22. 69 17. 20 . 443 
Bot te Bae 0-4-50 spray (no copper)..---------- 245 20. 14 15.13 . 400 
Do 1 See ooe eee 10=10—50 Bordeatixess- 22 22 1 ee 291 22. 43 17,15 - 444 
DO F265) hes. 48 Pickeringispray =. 2. saaee ec aa aaes 261 21. 92 16. 73 -443 
DO ree eae ee Check: (0) copper) s- 6-2 ee eee 288 20. 66 15. 68 . 429 
MeCormick? = _ =... - Cheek /(mo copper) & 2 5c 2522-46 245 21. 72 15. 85 430 
DOr ee Pe Q-4-50 spray (mo copper) ------------ 237 21. 36 15. 50 419 
ID Orisa. eet Pickerine Sprayecoete a see ee ee 259 21. 88 15. 90 - 456 
ID Ope ee Ee cress 2 44-50 Bordeaux ..-....2...---.------ 241 21. 32 15. 50 . 436 
1B) Oe een LO=10=500B ord cai. eee oe eee 226 21.47 15. 75 . 457 - 
1Average of 2 sets. 2A verage of 3 sets. 
The 10-10-50 Bordeaux spray showed no particular advantages 
over the 44-50 Bordeaux spray or the Pickering spray in either the 
early or late tests. The vines receiving the 0-4—50 spray, which con- 
_ tained no copper but did contain lime, usually showed yield results 
lower than those of the checks, but the results of the analyses of the 
tubers usually agreed rather closely with those obtained for tubers 
from the check plants. The yield data are variable, but on an aver- 
age are higher for the copper-sprayed than for the check plants. 
The data for solids, starch, and nitrogen are generally higher for 
the copper-sprayed than for the lime-sprayed or check plants. This 
indicates that copper is the essential constituent of the spray. 
Maine, New York, New Jersey, and Penns yloania. —Thirty-three 
samples of tubers from Bordeaux-sprayed plants from Maine, Penn- 
sylvania, and New Jersey and from Bordeaux-sprayed and Bordeaux- 
dusted and unsprayed potato vines in New York (Table 5) were 
examined. All of the plants were sprayed with an arsenical. San- 
der’s Bordeaux dust was used. The sprays and dusts were applied 
five times during the season. 
TABLE 5.—Composition of tubers from sprayed and unsprayed potato plants, 
Maine, Pennsylvania, New Jersey, and New York, 1920. 
Composition of tubers. 
Source. Variety. Treatment. 
Solids. | Starch. | Nitrogen. 
Per cent. Per cent. | Per cent. 
Mame: 2222.5 se irishiCobbler:- 5-e2----- 5-5-50 Bordeaux...-......-- 3 20K4 15.9 0. 367 
1D Oe ee a 2 ee Goss eS See Check (no copper).........-- 18. 39 13. 80 -o08 
DOR sees 8 nae Spalding Rose....-...... 5-5-50 Bordeaux .-.-...2..:. 18. 23 13. 80 . 356 
IDO 2 ose ae SRS ee GOs at ee Check (no copper)..-........- 18.13 13. 95 319 
DO 255555288e iMeCormick. 22-3: esas eeo- 5-5-50 Bordeaux.-.-.......- 21.70 16. 80 . 371 
DO oe ee ees GOS Bes Sele ee Check (no copper)..........- 20. 91 16. 00 - 356 
DOSS SSF Se Marly, Hoseteo: J-hee eee 5-5-50 Bordeaux. .--....-.:- 21. 65 17. 00 sol6 = 
DORE e es oes GOR acetic su ceeee Check (mo copper)........... 21. 93 16. 95 . 339 
“4 
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