19171 FIELD CROPS. 529 



The data also failed to show that there was any positive difference in the jaeld 

 of the potatoes following the corn. 



For the purpose of comparing the rotations the crops were given arbitrary 

 values as they were harvested and, after deducting charges for production and 

 fertilizers, the resulting net return used as a basis for comparison. The 6-year 

 rotation returned the highest average annual net profit of $16.45, with the 

 3-year rotation second and giving a net return of $14.26. The lowest return 

 was secured from the 5-year rotation without legumes and amounted to $11.66. 



Nitrogen determinations were made on the surface soil from each plat in 

 the rotations in 1912. All the plats of the 6-year rotation were noticeably high 

 in nitrogen, but further observations are deemed necessary before drawing 

 definite conclusions. The average nitrogen content for all rotations was 0.2342 

 per cent. 



[Field crops] Off. Bui. Wyo. Bd. Farm Comrs., 1914, PP- 32-65, 78-82, 90-108, 

 figs. 15). — Notes are given on the cultivation and agi'icultural value under 

 dry-farm conditions of wheat, oats, barley, emmer, rye, flax, alfalfa, peas, 

 sweet clover, corn, sweet sorghum, Sudan grass, brome grass, millet, potatoes, 

 rape, sand vetch, and beans. Practically all these crops have proved valuable 

 for this section with the exception of winter oats, winter barley, and emmer. 

 Rate and date of seeding tests and variety tests are in progress with most of 

 the above-named crops. 



The winter wheat varieties recommended at the present time are Turkey, 

 Kharkov, and Crimean, and for spring wheat varieties the durum wheats 

 and Spring Ghirka. The preferred rate and date of seeding spring wheat are 

 from 2 to 4 pk. between April 15 and May 1. Kherson and Sixty-Day are 

 deemed the best oat varieties, and should be sown at the rate of about 1 bu. 

 per acre about April 15. Spring barley sown at about April 15 at 1 bu. per 

 acre gave the best results, and Ouchac and Hannchen were the most satis- 

 factory varieties. Flax should be sown at the rate of 20 lbs. per acre about 

 June 1. The Kursk millets are deemed best for seed and forage production. 

 The highest yielding potato varieties were Irish Cobbler, Blue Victor, and 

 Early Ohio. The corn variety tests have not proved very satisfactory owing 

 to the difficulty of securing maturity. 



Field experiments, 1915 {Dept. Agr. and Tech. Instr. Ireland Jour., 16 

 {1916), No. 2, pp. 237-290) .—The results of field experiments for 1915 are 

 reported and discussed with barley, meadow hay, potatoes, mangles, oats, tur- 

 nips, and wheat. All the crop experiments except those with barley included 

 tests on peat soil, with special reference to the fertilizer requirements of the 

 various crops. Several experiments with liquid manure are also reported. 



Catch crops (Dept. Agr. and Tech. Instr. Ireland Jour., 16 {1915), No. 1, pp. 

 120-127). — A list of forage plants available for autumn catch crops is given. 



Forage plants {Bol. Min. Agr., Indus, e Com. [Brazil], Jf {1915), No. 8, pp. 

 68-72). — This article contains a brief discussion of the cultural habits and 

 forage value of several plants native to Brazil. 



The history of Kentucky blue grass and white clover in the United States, 

 L. Cabrier and Katharine S. Bort {Jour. Amer. Soc. Agron., 8 {1916), No. 4, 

 pp. 256-266). — This article reviews references to the natural vegetation of 

 America in an effort to trace the origin of Kentucky blue grass {Poa pratensis) 

 and white clover {Trifolium repens). The evidence seems to indicate that 

 these two plants were introduced into the United States. 



Com improvement in the Philippines, H. O. Jacobson {Philippine Agr. Rev. 

 [English Ed.], 8 {1915), No. 3, pp. 216-225, pis. 5).— This paper discusses the 

 development of the corn crop in the Philippines, with special reference to the 



