24 
BULLETIN 1248, U. S. DEPARTMENT OF AGRICULTURE. 
EXPERIMENTS AT THE COLORADO POTATO EXPERIMENT STATION. 4 
The size-of-seed studies at Greeley, Colo., were confined to the 
Rural New Yorker No. 2 variety. Tubers and cut seed of the follow- 
ing sizes were planted in 1916 and 1917: l-ounce whole, 2-ounce 
whole and halved, and whole, halved, and quartered sets of tubers 
weighing 3, 4, 5, and 6 ounces. In 1918 only seven sizes of sets were 
used,' viz, l-ounce whole, 2-ounce whole and halved, 3-ounce whole, 4- 
ounce halved and quartered, and 6-ounce halved. 
potato seed of 
Table ' 10. — Comparative yields from Rural New Yorker No. 
different sizes at Greeley, Colo., in stated years. 
[In the columns headed "Yield of primes, net" the quantity of seed planted has been deducted, making the 
number of bushels net, as given.] 
Weight 
ofset. 
Yield per acre, 1916. 
Yield per acre, 1917. 
Yield per acre, 1918. 
Kind of set 
planted. 
Primes. 
Culls. 
Yield of 
primes. 
Culls. 
Yield of 
primes. 
Culls. 
Yield of 
primes. 
Actu- 
al. 
Net. 
Actu- 
al. 
Net. 
Actu- 
al. 
Net. 
Whole: 
l-ounce 
2-ounce 
3-ounce 
4-nurice . 
Ozs. 
1 
2 
3 
4 
5 
6 
1 
? 
f 
u 
Bush. 
234.0 
264.6 
263.2 
279.6 
265.6 
271.8 
200.8 
238.5 
259.2 
214.6 
236.8 
205.9 
214.6 
231.2 
196.2 
Bush. 
22.9 
40.2 
51.3 
67.3 
82.5 
85.4 
20.1 
26.8 
27.2 
33.8 
37.9 
16.2 
16.2 
19.3 
18.5 
P.ct. 
91.1 
86.8 
83.7 
80.6 
76.3 
76.1 
90.9 
89.9 
90.5 
86.4 
86.2 
92.7 
93.0 
92.3 
91.4 
Bush. 
222.7 
241.9 
229.2 
234.2 
208.9 
203.7 
189.5 
221.5 
236.5 
186.2 
202.8 
197.4 
203.3 
217.0 
179.2 
Bush. 
312.4 
384.8 
378.0 
387.8 
410.0 
426.0 
302.7 
343.9 
350.9 
358.1 
367.9 
315.1 
327.0 
333.9 
350.3 
Bush. 
13.7 
23.7 
31.1 
37.0 
42.0 
49.4 
14.9 
21.6 
22.8 
25.7 
29.4 
11.4 
9.8 
12.8 
16.9 
P.ct. 
95.8 
94.2 
92.4 
91.3 
90.7 
89.6 
95.3 
94.1 
93.9 
93.3 
92.6 
96.5 
97.1 
96.3 
95.4 
Bush. 
301.1 
362.1 
344.0 
342.4 
353.3 
357.9 
291.4 
236.9 
328.2 
329.7 
333.9 
306.6 
315.7 
319.7 
333.3 
Bush. 
295.7 
332. 1 
316.8 
Bush. 
13.8 
22.6 
32.0 
P.ct. 
95.5 
93.6 
90.8 
Bush. 
282.7 
306.1 
277.8 
6-ounce 
Halved: 
2-ounce 
303.1 
12.2 
96.1 
290.1 
4-ounce 
5-ounce 
309.0 
19.7 
94.0 
283.0 
6-ounce 
Quartered: 
3-ounce 
295.7 
31.0 
90.5 
256.7 
4-ounce 
5-ounce 
286.3 
14.8 
95.1 
273.3 
fi-nimee 
■""T" 
Average Yields for Two Stated Periods. 
Weight 
ofset. 
Average yield per acre, 1916 
and 1917. 
Average yield per acre, 1916 
to 1918. 
Band of set planted. 
Primes. 
Culls. 
Yield of 
primes. 
Primes. 
Culls. 
Yield of 
primes. 
Actual. 
Net. 
Actual. 
Net. 
Whole: 
Ozs. 
1 
2 
3 
4 
5 
6 
] 
? 
? 
i 5 
i; 
Bush . 
273.2 
324.7 
320.6 
333.7 
337.8 
348.9 
251.8 
291.2 
305.1 
286.4 
302.4 
260. 5 
270. 8 
282 6 
27: ». 3 
Bush. 
18.3 
32.0 
41.2 
52.2 
62.3 
67.4 
17.5 
24.2 
25.0 
29.8 
33.7 
13.8 
13.0 
L6. I 
17.7 
P.ct. 
93.7 
91.0 
88.6 
86.5 
84.4 
83.8 
93.5 
92.3 
92.4 
90.6 
90.0 
95.0 
95.4 
94.6 
93.9 
Bush. 
261.9 
302.0 
286.6 
288.3 
281.1 
280.8 
240.5 
274.2 
282.4 
258.0 
268.4 
252.0 
259.5 
268.4 
256.3 
Bush. 
280.7 
327.2 
319.3 
Bush. 
16.8 
28.8 
38.1 
P.ct. 
94.4 
91.9 
89.3 
Bush. 
268.8 
2-ounce 
303.4 
3-ounce 
283.7 
4-ounce . 
5-ounce 
6-ounce 
Halved: 
2-ounce 
268.9 
15.8 
94.5 
257.0 
3-ounce 
4-ounce 
306. 3 
23.2 
93.0 
282. 6 
5-ounce 
B-oui) oft.. 
300.1 
32.8 
90.2 
204. 5 
red: 
8 -ounce. 
I-Oli'l'" 
276.0 
13.6 
95.3 
264. 1 

bave boon more or less completely reported by 0. F. Clark (one of 
ol this bulletin) in Colorado Btation Bui. 261, pp. 26-34, January, 1921 («S), and the 
rtmi ol "i Agriculture BuL 968, pp. 20 21, August, 1921 (..",). Inasmuch as these expert* 
pari of the department's general study of the size ofset in relation to yield and other corre- 
• tors iii" fuois obtained are embodied In the present report. 
