cuts generally in cereals. The same author in collaboration with 

 F re-en ius showed that increasing moisture, for example, rainfall 

 or irrigation, decreased the nitrogen percentage of oat straw. This 

 i- in lint* with the results of wheat analyses published by Le Clerc in 

 the Yearbook of the U. S. Department of Agriculture for 1906, in 

 which it was shown that a sample of wheat grown on irrigated land 

 11.1 per cent of protein, while the same seed sown on adjoining 

 nonirrigated hind produced a crop containing 17.7 per cent of protein. 

 It was also >hown that many samples of wheat grown on so-called 

 arid land contained over 3 per cent more protein than the same kind 

 of wheat gro\Mi in the more humid regions or under irrigation. 



Wohltmann ' carried on experiments extending over several years 

 on the influence of weather conditions on the composition of cereals 

 and found that rainy, cloudy -ummers decreased the percentage of 

 nitrogen and that dry. -unn\ , and warm summers increased the pro- 

 tein coni 



md that the increase of salt content of alkali soils pro- 

 duced an increase in the nitrogen and the ash of wheat, tho'ugh the 



lute amount of the-e con-tit uent.- decreased, due to the fact that 

 the grain- were smaller. This, in a certain way, explains the good 

 Duality of the rather -mall grains of wheat grown in southeastern 

 Ku ia. northwestern America. Hungary, etc., where the soil is rich 

 in -oluble salt-, especially nitrates. It has, however, generally been 

 a timed that fert ili/rr- influence th: yield considerably and to a 



iler extent the composition. In like manner, soil is one of the 

 le . alfeciiiiL r the composition of wheat. This is the opinion 



of La u- and (iilbert. Hall, Wiley, and others; though, of course, a 

 nitrogen-rich -oil will yield a crop of a somewhat greater nitrogen 

 content than will a nitrogen-poor soil. 



CONDUCT OF THE EXPERIMENTS. 



Two -ample- of wheat were used in the experiments: (a) Kubanka, 



a durum wheat of the spring variety grown in South Dakota, Kansas, 



and California: (b) Crimean, a common wheat of the winter variety, 



grown in Texa-. Kansas, and California. The original Kubanka seed 



i for the South Dakota, Kansas, and California triangle was 



A n in South Dakota in 1905 and sent to Kansas and California for 



the 1906 sowing, a sample likewise being grown in South Dakota in 



1906. The crop thus obtained at each point in 1906 formed the real 



>t a it ing point of the tri-local experiment. The South Dakota seed of 



"J. Landw., 1905, 53: 27. 

 l > ( entrbl. Agr. Chem., 1906, 35: 41. 

 cExper. Sta. Rec., 1901-2, 13: 329. 

 31853-Bull. 12810 2 



