IOWA ACADEMY OF SCIENCE 45 



collections represented both early and late crops, and were gathered 

 from a number of different soils. 



The range of averages was great in the soil groups, both seasons; 

 no definite relationships are indicated by them. It does not, so far, 

 appear that rich soils produce most seed, nor the reverse. 



For first crop, the collection with highest average is for Ames, clay 

 loam, medium elevation, for 44 heads, average 64.7 seeds; the collec- 

 tion with the lowest average is for Ida Grove "black loess," for 50 

 lieads, average 1.82 seeds. 



For second crop, the highest average is for the collection from Al- 

 gona "town lot, deep black loam," 28 heads, average 80.4 seeds; the 

 collection with lowest average is for Harlan, "black river bottom," 

 clay subsoil (this year's seeding), 50 heads, average 3.9 seeds. 



One thousand two hundred forty-two heads of first crop clover con- 

 tained 32,285 seeds; average 25.99 seeds; 701 heads of second crop 

 clover contained 19,318 seeds; average 27.55 seeds. 



A count was made of 200 heads, first crop, normal thrifty plants; 

 average 41.11 seeds; also of 200 heads second crop, normal thrifty 

 plants, average 43.72 seeds. 



In both the above sets of averages, the heads of second crop exceed 

 those of first crop in number of seeds. 



