Report op Aepaepa Investigations 9 
the climatic and cultural conditions. All the observations on this 
point seem to indicate the fact, that outside of insect injuries, the 
proper supply of moisture, is the greatest factor in determining the 
seed yield of alfalfa.* The heaviest yield of seed is produced, when 
the plants make a relatively slozv dwarfed growth. 
Under irrigation, the usual system of flooding supplies too 
much water, and the alfalfa grows too rank for a seed yield; on 
the other hand, without irrigation, the seed fails so often, to fill, on 
account of the lack of water. But where the roots can penetrate to 
just the proper condition of moisture, or when irrigation is applied, 
at just the right time and amount, the happy medium is reached, 
and a good yield of seed is realized. 
Pirate V. Contrasts in Seed Yieed oe Individual Plants 
Samples taken at random. Beginning at left, No. 1, Argentine; No. 
2, Arizona; No. 3, dry land, Nebraska; No. 4, from Rocky Ford; No. 5, 
Turkestan; No. 6 and 7, U. S.; No. 8 , U. S., No. 17,698, northern Montana, 
evidently Turkestan, 7 grams; No. 9, dry land, Nebraska; No. 10, High- 
more, S. D.; No. 11, Argentine; No. 12, Argentine. 
The only practical method to regulate moisture, or to control 
irrigation for alfalfa seed culture, is to sow the seed in rows with 
space, to permit intertillage to conserve the moisture from rains or 
winter irrigations, and to enable the rows being “logged” out with 
clear cut furrows, in about every other row; so that the lightest 
