14 Colorado Agricultural College 
be practiced once every two years, so as to keep up and improve 
the standard in yield and in quality. This may seem an expensive 
practice, but since the grower has to provide seed for next season's . 
planting, the extra trouble and cost in selecting and keeping the 
seed separate is small in proportion to the benefits derived. If every 
grower should follow this practice, we would hear less of run-out 
seed, and less of poor yields and diseased fields. 
In planting potatoes for seed, especially if the seed is to be 
used for planting whole the following year, it is better to have the 
seed dropped from eight to ten inches apart in the rows and the rows 
three feet apart. This will somewhat crowd the plants and will 
cause them to produce a larger number of seed potatoes of relatively 
smaller size, that is, of a size best suited for seed purposes. It is 
also well to delay the planting of the seed plot until the rest of the 
crop is planted, in some instances, two weeks later than the main 
crop. The soil for the seed plot need not be better nor be given 
A promising Seed Plot of Ed. Clamson, Carbondale, Colorado 
Note the strong and vigorous growth of vines 
* 
better treatment than that given to the main crop. The main pur¬ 
pose of having a separate seed plot is to keep the behavior of the 
individual potato plants under close observation. 
Roguing .—While the seed plot represents a definite stage in 
the improvement of a given variety, it does not follow that the 
grower should rest satisfied with the results obtained. No matter 
how careful the hill selection has been and how much care has been 
taken in preparing and planting the seed plot, there will always be 
a certain number of individual plants that show weakness, either 
along the line of disease or in lack of growth vigor. These undesir¬ 
able hills should be removed during the growing season or when¬ 
ever they are found. The grower should watch his seed plot and 
