738 EXPEEIMENT STATION RECORD. 



Fertilizers for tobacco, Trichebeau {Jour. Agr. Prat., n. ser., 27 (1911^), 

 No. 22, pp. 691-69S). — Results of two years' trials show the profitableness of 

 using a potassic fertilizer (sulphate of potash) for tobacco. 



Field experiments with wheat, M. H. Reynolds {Agr. Gaz. N. 8. Wales, 

 25 {1914), No. 1, pp. 1-20). — In rotation experiments for the years 1907-1912, 

 inclusive, wheat grown continuously produced an annual average yield of 

 16.8 bu. per acre, wheat alternated annually with bare fallow averaged 24.8 bu., 

 and wheat alternated annually with a fodder crop averaged 26.4 bu. In testing 

 the value of burning the straw, plowing the straw under, or removing the straw 

 with the binder, average yields, respectively, of 23.5, 22.6, and 22 bu, per acre 

 were obtained. 



" In the continuous wheat section the application of manure is shown to be 

 most beneficial, its relative value increasing as the yield from the unmanured 

 portion decreases. The best return is obtained from the complete manure, fol- 

 lowed closely by the combination of phosphoric acid with potash, and of phos- 

 phoric acid with nitrogen. Superphosphate alone gives a substantial increase 

 of one-third over the six years of the test, while the results from potash alone 

 and in conjunction with nitrogen, are slight. The use of nitrogen has resulted 

 in a return lower than that of the check plats. 



" In the ' wheat after bare fallow " section, the increases throughout are 

 slight, the best return being given by phosphoric acid and potash, followed, a 

 long way after, by the complete manure. Superphosphate alone has a slight 

 influence for good, while potash and nitrogen alone both yield lower returns 

 than the unmanured portion. In the ' wheat after fodder crop ' the best re- 

 turns are also given by phosphoric acid and potash, followed closely by phos- 

 phoric acid alone and the complete manure. Nitrogen, in combination with 

 phosphoric acid, is also of considerable benefit, while the effects of the others 

 may be considered negligible." 



A case of correlation in wheat, W. H. Pabkek {Jour. Agr. Sci. [England], 6 

 {1914), No. 2, pp. 179-181). — In this article the author notes a high correlation 

 between the total length of the rachis and the average internode length (ob- 

 tained by dividing the length of the rachis in millimeters by the number of 

 internodes of the straw). The coeflScient of correlation is given as +0.9099 in 

 the case of a square head variety of wheat. A correlation table is given. 



On various treatments for the disinfection of seeds, T. Bokoeny {Biochem. 

 Ztschr., 62 {1914), No. 1-2, pp. 5S-SS).— Experiments testing the efficiency of 

 various treatments of seeds of barley, lentils, white beans, cabbage, and cress 

 are described. 



The treatments considered effective were immersing the seed at the boiling 

 point for one-half minute in 0.1 per cent solution of copper sulphate, 1 per cent 

 acetic acid, or 1 per cent solution of soda (crystals) ; immersing for 1 minute 

 in 96 per cent alcohol at either 15° C. or the boiling point ; treatment with alco- 

 holic solution of potash (50 cc. of 30 per cent potash solution and 50 cc. of 96 

 per cent alcohol) at 15° ; and one-half minute treatment with alcohol solution 

 of hydrocloric acid (50 cc. of 90 per cent alcohol and 50 cc. of crude IICl). 



The treatments that the author considers inefiicienL were immersion at air 

 temperatui'e in copper sulphate solution, alcoholic solution of formaldehyde, 

 alcoholic carbolic acid solution, alcoholic acetic acid, or acetic acid; treatment 

 with 0.5 per cent of copper sulphate at 60° ; one-half minute treatment at the 

 boiling point with either 2 to 10 per cent copper sulphate or 0.1 per cent perman- 

 ganate solution ; or 2-mluute treatment with boiling water. 



Cooperative experiments in weed eradication, J. E. Howitt {Ann. Rpt. On- 

 tario Agr. Col. and Expt. Farm, 39 {1913), pp. 46, -i?)- — This notes successful 

 methods employed by farmers under the direction of the college. The use of 



