jo The Colorado Experiment Station. 
often hear growers say that they wish they could raise Blue Pearls be¬ 
cause of the yield. Sports of this sort afford a good starting point for 
improved strains, but we do not find the increased yield is long maintained 
of itself. We have secured here, at Greeley and at Montrose, from dry 
land Blue Victors, by means of good conditions and the liberal use of 
manure and artificial fertilizers to induce variation, about 150 pounds 
of new White Pearls, to be used at Carbondale in starting an improved 
strain of Pearls. 
Close Planting on deep soils here results in great increase of yields 
and most desirable uniformity of size. Note the yields secured from 
stakes 200 to 190. Deep rooting sorts like the Rural respond the best to 
this practice. Note that the use of double the seed, or 1000 pounds more 
per acre, is more than doubly returned in the small seed secured in 
the crop, and a profit in the ware averaging, on the six lots of Rurals 
3049 pounds per acre, for the five inch instead of 10 inch planting. The 
much more saleable uniform crop is also to be remembered. 
Source of Pearl Seed for the San Luis.—Note the difference in the 
same pedigreed stock of White Ohios, one lot I;ept the last year at Gree- 
May 7-9: 
CHEYENNE WEI,LS—11)1 w 
Planted 24x30. 
Stake 
Variety and Source 
Total 
37 
Pearl Divide . 
1403 
38 
Pearl—3 yr. Greeley . 
1422 
39 
Pearl — 2 yr. Stove P. 
2848 
40 
Pearl—1 yr. Greeley . 
1564 
41 
■ppa rl 10 vr Stnvp P . 
1754 
42 
Pearl Montrose . 
1228 
43 
Cobbler- — Akron . 
1020 
44 
Cobbler — Maine . 
1709 
45 
Cobbler—Mancos . 
1719 
46 
Carmen I — Maine . 
1916 
47 
Peachblow — Flagler . 
2455 
48 
E. Ohio Maine . 
2286 
These were planted by hand, under excellent conditions, and the stand was 
practically perfect, except for damage in cultivation. 
ley and the other lot at Pagosa Springs. The ware yield of the latter is 
double the former. Note the same with Pearls the sixth year at Greeley 
on the same farm (176) or that the sixth year at Pagosa (175), and com¬ 
pare again with 173, changed to another farm at Greeley the last year 
before coming to Del Norte, and with (200) the yields of big Del Norte 
grown seed which gave a very poor stand. Compare also the yields from 
first, second, and third year Greeley Pearl seed, remembering that of this 
seed secured in the same neighborhood the “first year” was much the 
poorer. 
San Luis Valley Profits in potato growing depend on the seed secured. 
First year Greley seed is much better than that longer at Greeley; seed 
grown at Pagosa or Del Norte from Greeley or (presumably) from dry 
land or Wisconsin seed is much better still. By the results with Rurals, 
a strong presumption is raised that Pearl seed raised by close plantings 
of the best Pearl seed brought to Del Norte will run enough to seed size 
so that the rest of the valley may well look to Del Norte as a source of 
seed, provided only and always that the parentage of the seed offered 
be known. 
Conditions and Parentage: net Place alone are to be considered in 
the matter of seed changes. To no potato growers of Colorado are the 
principles underlying these matters more important than to those of the 
San Luis. See Bulletin 17 6. 
