FACTORS FOE YIELD AND QUALITY OF SPRING WHEAT 69 
Federation were obtained, no F 3 strain was studied which exceeded, 
-although several practically equaled, Marquis in crude-protein con- 
tent. 
The product of average yield per plant and crude-protein content 
was used to measure the amount of improvement made over the 
parents. The six leading strains at Bozeman, Moccasin, and Havre 
exceeded the best Marquis check rows from 1.5 to 81.8 per cent. 
This improvement in yield X crude-protein content apparently was 
obtained by combining the advantages of the long fruiting period 
of Hard Federation and the height of Marquis. 
The amount of correlation was determined between all of the six 
quantitative characters — heading period, ripening period, fruiting 
period, height, yield, and crude-protein content — at Bozeman, 
Moccasin, and Havre. The amount of correlated inheritance was 
found for each character in the F 2 and F 3 generations at Bozeman, 
and also in the F 2 generation at Bozeman with the F 3 generation at 
Havre. 
Important and significant negative correlations were obtained 
between heading period and fruiting period and large positive corre- 
lations between ripening period and fruiting period. 
The longer fruiting period and greater height were the most im- 
portant factors positively correlated with larger yields. 
Fruiting period, height, and yield were, on the average, all nega- 
tively correlated with crude-protein content. 
Correlation between F 2 plants and F 3 strains, indicative of inheri- 
tance, were obtained in important significant amounts at Bozeman 
for heading period, height, and yield and at Moccasin for height 
and yield. Only one character, heading period, was inherited in a 
significant amount in F 3 strains at Havre in 1924 from their F 2 
parent plants raised at Bozeman in 1923. 
It is expected to develop, through the further testing of selections 
made on the basis of these studies, a new variety better adapted to 
Montana conditions than either Hard Federation or Marquis. 
LITERATURE CITED 
(1) Beaven, E. S. 
1920. Breeding cereals for increased production. In Jour. Farmers' 
Club [London 1 ], pt. 6, pp. 107-121. 
(2) Biffen, R. H. 
1905. Mendel's laws of inheritance and wheat breeding. In Jour. 
Agr. Sci., vol. 1, pp. 4-48, illus. 
(3) Bryan, W. E., and E. H. Pressley. 
1921. Plant breeding. In Ariz. Agr. Exp. Sta. Ann. Rpt. 32, pp. 
601-605, illus. 
(4) Carleton, M. A. 
1916. The Small Grains. 699 pp., illus. New York. 
(5) Clark, J. A. 
1925. Segregation and correlated inheritance in crosses between 
Kota and Hard Federation wheats for rust and drought 
resistance. In Jour. Agr. Research, vol. 29 (1924), pp. 1-47, 
illus. 
(6) D. E. Stephens, and V. H. Florell. 
1920. Australian wheat varieties in the Pacific coast area. U. S. 
Dept. Agr. Bui. 877, 25 pp., illus. 
