DESCRIPTION OF PLATES. 



Plate I. Frontispiece. Grass garden at the Nebraska Experiment Station. The 

 forage plants are first tested on these plots, which are 3 feet square. Those 

 which give favorable results are given a further trial on larger plots, some of 

 which are seen in the background. 



Plate II. An alfalfa plant from seed sown August 19, 1902, and dug up April 13, 

 1903, showing the tubercles upon its roots by means of which nitrogen is gath- 

 ered from the air. 



Plate III. Fig. 1. — Three plants of brome-grass (Bromus inermis) from seed sown 

 August 19, September 19, and October 1, 1902, respectively. They were taken 

 up and photographed April 13, 1903. The plant at the right from the last sow- 

 ing had barely enough vitality to survive the winter. Fig. 2. — Three alfalfa 

 plants from seed sown at the same date as the brome-grass, and also taken up and 

 photographed April 13, 1903. A later sowing, October 21, was almost entirely 

 winter killed, as the young plants had not sufficient vitality to withstand the 

 cold. 



Plate IV. Fig. 1. — Plots of Bromus inermis showing the effect of fertilizers. The 

 plot at the left is a mixture of brome-grass and alfalfa; the plot at the right is 

 brome-grass fertilized with sodium nitrate; the plot in the center is brome-grass 

 alone and unfertilized. The effect of an admixture of alfalfa is about the same 

 as an application of sodium nitrate. This seems to indicate that the brome- 

 grass is able to share with the alfalfa the nitrogen which the latter obtains from 

 the air. The plots were sown April 21, 1899, and photographed June 12, 1903. 

 Fig. 2. — A pasture containing orchard grass, showing the growth of this grass 

 upon low land. The pasture was seeded in 1898 with several grasses, among 

 which was orchard grass, but in this part of the field the latter was especially 

 rank. The photograph was taken in June, 1901. 



Plate V. Fig 1. — A field of brome-grass sown in the spring of 1898 and broken in 

 the fall of 1901. The picture was taken in January, 1902. Brome-grass forms 

 a thick, firm sod, resembling that of native prairie. Fig. 2. — A field of brome- 

 grass. The seed was sown in the spring of 1902, and the picture was taken June 

 15, 1903. 



Plate VI. Fig. 1. — A field of side-oats grama (Bouteloua curtipendula) just before 

 ripening. The seed was sown in the spring of 1900, and the photograph taken 

 July 17, 1902. Fig. 2. — A field of wild rye (Ely rims canadensis). The seed was 

 sown in the spring of 1901, and the photograph taken July 17, 1902. 



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