38 



BULLETIN 30, U. S. DEPARTMENT OF AGRICULTURE. 



sizes of seed of these varieties. It was as difficult to get a sufficient 

 number of the small-sized Kubanka kernels as it was to get the 

 large-sized Ghirka kernels. The different grades of seeds were ob- 

 tained, however, and sown as described. A summary of the results 

 obtained is presented in Table XV. 



Data relative to percentage of survival, number of plants maturing, 

 number of heads per plant, and yield in grams are presented. The 

 figures in each column of the table represent the average of three 

 rows. For example, the first figure in the first column, 61, represents 

 the average percentage of survival of large seed of Kubanka sown 2 

 inches apart in three rows which were 5 feet long and 8 inches apart. 

 Averages of all rates of seeding for each size of seed are given, as well 

 as averages of all sizes of seed for each rate of seeding. 



Table XV. — Results obtained from sowing large, medium, small, and unseparated seed 

 of two varieties of spring wheat, at different distances in the row, at the Nephi sub- 

 station in 1909. 



Variety and size of 

 seeds. 



Kubanka (C. I. No. 



1440): 

 Large (3 mm. 



and larger). . . 

 Medium (2 to 



2.5 mm.) 



Small (less than 



2 mm.) 



Unseparated . . . 



Average 



Ghirka (C. I. No. 



1517): 

 Large (3 mm. 



and larger)... 

 Medium (2 to 



2.5 mm.) 



Small Hess than 



2 mm.) 



Unseparated . . . 



Average 



Percentage of sur- 

 vival. 



Distance be- 

 tween seeds 

 (inches). 



2 4 6 8 10 12 



6*69 73 



6156 64 



I 

 55 62 36 

 6156 45 



Aver- 



Number of plants 

 maturing. 



Distance be- 

 tween seeds 

 (inches). 



2 4 6 8 1012 



11 s 

 9 7 



io; 4 



9 5| 4 

 19 10 6 5 



A.ver- 



Number of heads 

 per plant. 



Distance be- 

 tween seeds 

 (inches). 



2 4 6 8 10 12 



Aver- 



Yield of rows 

 (grams). 



Distance be- 

 tween seeds 

 (inches). 



.'. is 

 6 50 



744 

 7 56 



6:50 



6 8 



3136 



38 37 

 33 39 



38 31 



43 39 



38 37 

 I 



42 30 

 28 28 



20 12 

 23 23 



28 23 



Aver- 



Table XV shows that the large seed of both varieties had the highest 

 percentage of survival in every instance. The small seed had the 

 lowest percentage of survival in most instances, while the average 

 survival of the original, unseparated seed was generally high. The 

 Large seed produced the greatest number of plants which matured. 

 Fewer heads per plant, however, were produced by the large seed 

 than by any other grade. The yields obtained from the large seed 

 were higher, in most cases, than were those obtained from the medium 

 or small seed. There was little difference, however, between the 

 yields obtained from the large and the original, unseparated seed. 



