234 EXPEEIMENT STATION EECORD. 



may reach, under favorable conditions, 1,400 lbs. of cured tobacco to the acre. 

 The percentage of the best grades of tobacco in the crops grown has been high. 

 The leaves are about 18 in. long and 15 in. wide and of a round shape, adapted to 

 economical cigar-wrapper cutting. The grain in the leaves is evenly distributed 

 from the tip to the base ; the veins are small and fine ; the burn excellent, leav- 

 ing a white to gray colored ash, and the tobacco has sufficient body and stretc-h 

 so that when wrapped on cigars it stands handling without injury. 



The Brewer Hybrid and Cooley Hybrid tobacco have lieen jireviously described 

 (E. S. R.. LS, p. ^r,). 



The effect of climatic conditions on the composition of durum wheat, 

 J. A. LeClerc (f'. <S'. Dej)t. Ayr. Yearbook 1906, pp. 199-212, pis. 2).— The value 

 of durum wheat as a source of human food is discussed and the factors which 

 influence the quality of the grain are noted. Cooperative work on this subject 

 has been in progress for 2 years, and the comparison in this article is limited to 

 Kubauka, a Russian or northern wheat, and Pelissier and Marouani, Meditei'- 

 ranean wheats from Algeria, these being the varieties grown in many different 

 localities during this'time. 



The analytical results of wheat grown in arid and humid regions in 1903 show 

 a difference of 0.57 per cent of nitrogen in favor of wheat grown in the drier 

 localities. The percentage of ash and of phosphoric acid was influenced but 

 little, while the weight per thousand grains was generally considerably higher 

 in wheat from the humid and irrigated regions. It was further observed that 

 the arid and semiarid regions produced the largest percentage of flinty gi'ains. 



In 1904 Kubanka wheat was grown in 7 localities with 15 in. or less of rain- 

 fall, and in G localities with more than 15 in. of rainfall or having irrigation. 

 The grain from the drier regions contained 0.47 per cent more nitrogen than 

 the grain produced under the more humid conditions. In other work done in 

 14 different localities in the Western States wheat from 7 of the places where 

 irrigation was practiced contained on an aA'erage 12.1 per cent of protein and 

 wheat from the remaining 7 places without irrigation contained 15.4 per cent. 



A comparison of irrigated and nonirrigated durum wheats grown in Mexico 

 showed that the irrigated wheat contained 11.1 per cent of protein and 20 per 

 cent of flinty grains, and the nonirrigated wheat 17.7 per cent of protein and 

 100 per cent of flinty grains. The seed from which this wheat was grown had a 

 protein content of 12.3 per cent, 100 per cent of flinty gr>ains, and a weight of 

 38.8 gin. per thousand grains. The weight per thousand grains of the irrigated 

 and nonirrigated samples was 29.4 and 29.2 gm., respectively. 



A number of samples of Kubanka wheat were grown in Idaho and Colorado 

 under dry-land farming and under irrigation. The dry-land samples contained 

 on an average 2.75 per cent of nitrogen, 2.12 per cent of ash, and 1.07 per cent 

 of phosphoric acid. The weight per thousand grains was 30.3 gm.. the weight 

 per bushel 00.9 lbs., and the percentage of flinty grains 98. The samples pro-, 

 duced under irrigation showed an average content of 2.02 per cent of nitrogen, 

 2.11 per cent of ash, and 1.03 per cent of phosphoric acid, together with a weight 

 per thousand grains of 36.6 gm., a weight per bushel of 62.7 lbs., and 55 per 

 cent of flinty grains. 



The effect of long and short periods of growth on nitrogen content and weight 

 was also studied. The growing period of the samples under observation varied 

 from 71 days in Oklahoma to 254 days in Washington, where the sample was 

 grown as a winter variety. The difference in the average results between the 

 short and long growing periods was 0.35 per cent of nitrogen, or 2.1 per cent of 

 protein, the larger percentage of nitrogen being, as a rule, associated with the 

 shorter growing period. It is pointed out that at North Enid, Okla., with 71 

 days as the growing period and 64° as the average temperature of that period, 



