536 EXPERIMENT STATION RECORD. 



Flax growing', A. Keyser (Colorado 8ta. Circ. 11, pp. S). — A discussion of 

 tlie soil requirements of flax with si>ec-ial reference to Colorado conditions is 

 followed by directions for producing the crop in that State. 



Potato experiments, 1910-11, G. Valdek (Agr. Gaz. N. 8. Wales, 22 {1911), 

 ]\o. 10, pp. 819-881). — Approximately equal yields of potatoes followed applica- 

 tions of (1) 8 cwt. dried blood, 8 cwt. superphosphate, and 4 cwt. sulphate of 

 potash, and (2)4 cwt. sulphate of amnionia, 13 cwt. superphosphate, and 3 cwt. 

 sulphate of potash, each applied at the rate of 4 cwt. per acre. Tests of 11 

 varieties in a number of districts are also reported. 



Experiments with potatoes, 1910, W. Bruce (Edin. and East of Scot. Col. 

 Agr. Rpt. 2.'t, 1911, pp. 10). — These exi>eriments are a continuation of those 

 previously noted (E. S. R., 23, p. 236). 



Potatoes brought from Banffshire and planted in Fifeshire showed remark- 

 able vigor and in the following year the sui)eriority of the seed originally from 

 Banffshire was still very apparent. Up-to-date potatoes secured from 3 other 

 sources considerably excelled in yielding power those grown in East Lothian, 

 but the Langworthy variety apparently lost vigor when bi'ought to the higher 

 elevation. The results of fertilizer and spraying tests are also reported. 



Report on experiments on the manuring of potatoes in 1907 and 1908, 

 R. P. Wright (West of Scot. Agr. Col. Ann. Rpt. 10 (1911), pp. 107-132).— 

 These experiments were conducted in 1907 on 17 different farms and in 1908 

 on 14 farms in central and southwest Scotland. They tested farmyard manure, 

 superphosphate, sulphate of ammonia, sulphate of potash, basic slag, sulphate 

 of iron, potash manure salt, nitrogen lime, nitrate of lime, and nitrate of soda, 

 either singly or in various combinations and in various amounts. 



The author concludes that the most successful and profitable mixture of com- 

 mercial fertilizers when used in conjunction with 10 tons of farmyard manure 

 per acre was 1^ cwt. sulphate of ammonia, li cwt. sulphate of potash (94 per 

 cent pure), 3 cwt. supei-phosphate (30 per cent soluble), and sufficient basic 

 slag to contain as much citric-acid soluble phosphoric acid as is contained in 

 3 cwt. of superphosphate. This mixture produced a larger and more profitable 

 yield than a similar one in which only 1 cwt. of sulphate of ammonia was used, 

 or another in which all the phosphate was applied as superphosphate. Neither 

 the 30 per cent potash manure salt nor muriate of potash equaled the 94 per 

 cent pure potash manure. Calcium cyanamid, when used in quantities supply- 

 ing no more nitrogen than that contained in 1 cwt. sulphate of ammonia, ap- 

 peared even more effective than the latter on some farms, but distinctly inferior 

 on others. During 1 year nitrate of lime gave results almost equal to those 

 which followed the use of sulphate of ammonia. Nitrate of soda and sulphate 

 of ammonia gave practically equal increases in the yield of the potato crop. 



Tables state in detail the yields of diseased potatoes and of potatoes of dif- 

 ferent sizes obtained by the use of each of the fertilizer applications at each of 

 the farms during the 2 years of the test. Smaller tables summarize the effect 

 of the use of farmyard manure in large and small applications, both alone and 

 with commercial fertilizers, and compare basic slag and superphosphate. Pot- 

 ash manure salt is also compared with sulphate of potash, muriate of potash 

 with sulphate of potash, and nitrogen lime with sulphate of ammonia and with 

 nitrate of soda. 



Literature on the races of rice in India (Agr. Ledger, 1910, No. 1 (Veg. 

 Prod. Ser., No. 113), pp. 335-594). — This is the concluding portion (L-Z) of the 

 index previously noted (E. S. R., 25, p. 236). 



[Green manuring' for swedes], P. McConnell (Jour. Neiv Zeal. Dept. Agr., 

 3 (1911), No. 2, pp. 102-lOJt)- — Each of the 4 plats in this test was green 

 manured, and 3 of them were given additional fertilization with bone dust, 



