1919 J FIELD CROPS. 645 



Data are also presented showing the effect of crop rotation as it influences the 

 return from manure and fertilizer on wheat: 



Wheat yichlH as affected by rotation, manure, and fertilizer, 25-year average. 



Treat ment. 



Bushels 

 per acre. 



Continuous wheat, nothiug 



Continuous wheat, manured 



Continuous wheat, heavily fertilized. 



Wheat in rotation, nothing 



Wheat in rotation, manured 



Wheat in rotation, heavily fertilized. 



9.5 

 17.4 

 17.9 

 20.7 

 25.9 

 29.1 



The cultivation of wheat in Argentina, III, IV, C. D. Girola {Bol. Min. 

 Agr. lArgcntina], 20 (l'.)16), No. 1-2, pp. 52-59, figs. 4; 22 (,1911), No. 2, pp. 

 113-130, figs. 5). — In continuation of work previously noted (E, S. R., 35, p. 

 740), the author describe.s and illustrates Triticutn turgidum var. racwmosum, 

 and two varieties of durum wheat designated as Candeal and Taganrock, respec- 

 tively. Three strains of T. satimim, Barleta, Fi-ench, and Italian, together with 

 two additional strains of durum wheat, Medeah and Belotourka, are illustrated, 

 as well as T. polonicum, stiid to be oilen confused with Candeal. 



Fertile wheat-rye hybrids, H. H. Love and W. T. Craig (Jour. Heredity, 10 

 {1919), No. 5, pp. 195-207, pi. 1, figs. 11). — In this paper, a contribution from 

 the department of plant breeding, Cornell University, the authors describe a 

 fertile wheat-rye hybrid secured in a cross between Dawson Golden Chaff and 

 common rye. That the seed developed on the F^^ plant resulted from self- 

 fertilization and not from back-crossing with wheat or rye is believed to be 

 demonstrated by the intermediate character of its progeny. It is deemed pos- 

 sible that certain varieties of wheat may produce fertile wheat-rye hybrids. 



Some effects of the war upon the seed industry of the United States, W. A. 

 Wheeleb and G. C. Edleb (17. S. Dept. Agr. Yearbook 1918, pp. 195-214, fiffs. 

 6). — This comprises a general discussion of the effect of the war upon imports 

 and exports of seeds, domestic demands for seed, seed production, and stocks, 

 prices, and movement of seeds, together with some of the local problems of 

 wholesale and retail seedsmen, and the seed reporting service of the Bureau of 

 Markets. 



Second annual report Colorado Seed Laboratory, W. W. Robbins {Colorado 

 Sta., Seed Lab. Bui., 1 {1918), No. 3, pp. 5-23, figs. 5).— The work of the 

 laboratory for the year ended November 30, 1918, is described. A total of 3,631 

 samples of seed were examined. The most common impurities of the important 

 crop seeds sold in the State are indicated, and a list is presented showing the 

 weed seeds found in the samples analyzed. 



Seed Beporter (U. S. Dept. Agr., Seed Rptr., 3 {1919), No. 3, pp. 8, fig. 1). — 

 Tabulated data are presented showing the estimated acreage, yield, and prices 

 of medium red, alsike, and sweet clover, and alfalfa seed about August 22, 1919 ; 

 the commercial stocks, receipts, and exports of field seeds and root and vege- 

 table crop seeds for Canada based on the seed survey of June 30; the commer- 

 cial stocks and receipts of field seeds by geographic divisions for the United 

 States as of June 30 ; the commercial vegetable seed stocks of the United States 

 on June 30 for each of the past four years ; and the imports of forage plant 

 seeds permitted entry into the United States. Information relative to the 

 sugar beet seed situation; vegetable seeds; the red, alsike, and sweet clover 

 and alfalfa seed outlook ; the liairy vetch seed crop ; and the movement, price, and 



