32 IMPROVING THE QUALITY OF WHEAT. 



for several j^ears and small seed from a crop grown from small seed 

 for several j^ears. Five varieties of wheat were used. The average 

 results for three years were a difference of 1,067 to 1,828 kilograms 

 of grain ])er hectare in favor of the large seed, but the difference was 

 in general greater the first year than later. The use of large seed 

 gave a crop with kernels larger than those grown from small seed. 



Middleton ^' reports the yields obtained from large wheat kernels 

 to be almost doulile those obtained from small seed kernels. 



Bolle}^'' as the results of experiments continuing for four years in 

 which plump kernels of large size and plump kernels of small size 

 were selected for seed, concludes that ''perfect grains of large size 

 and greatest weight produce better plants than perfect grains of 

 small size and light weight, even when the grains come from the same 

 head." ' 



At the Ontario Agricultural College. Zavitz'' selected large plump 

 seed, small plump seed, and shrunken seed of both spring and winter- 

 wheat. Experiments were continued for eight years with spring 

 wheat and five years with winter wheat, the selections each year 

 being from a crop grown from previously unselected seed. His 

 results are as follows: 



Deherain and Dupont*^^ report that the yields from small and large 

 kernels of a number of varieties of wheat were in all cases in favor of 

 the large kernels, but a large difference in yield was obtained only 

 when there was a marked difference in the weight of the kernels. 



Soule and Vanatter* conducted experiments for three years in 

 which large and small kernels were separated by means of sieves. 

 In addition a plot of unselected seed was planted. The large seed 

 was, each year after the first, selected from the crop grow^n from 

 large seed the previous year. The same was true of the small seed. 

 These investigators say: 



« Abstract, Experiment Station Record, 12, p. 441, from 'Univ. Coll. of Wales Kept., 

 1899, pp. 68-70. 



'' North Dakota Experiment Station Report, 1901, p. 30. 



'Ontario Agricultural College and Experiment Farm Report, 1901, p. 84. 



'' Abstract, Experiment Station Record, 15, p. 672, from Compt. Rend., 135 (1902), 

 p. 654. 



« Tennessee Experiment Station Bulletin, vol. 16, No. 4,. p. 77. 



