34 EXPERIMENT STATION RECORD. [Vol.38 



ammonium sulphate alone and 370.5 lbs. from the untreated check. Applica- 

 tions of 1 and 1.5 cwt. of muriate of potash resulted in yields- of 434.5 and 459 

 lbs. per acre, respectively. 



Liming tests were continued at four centers in 1914 and 1915. Increased 

 yields of scutched flax resulting from an application of 2 tons of lime amounted 

 to 65 lbs. per acre in 1914 and 28 lbs. in 1915. Supplementing the lime with 

 1 cwt. of muriate of potash at seeding time apparently increased the yield 

 by 121 lbs. per acre in 1914 and by 45 lbs. in 1915. 



Varieties of potatoes, C. F. Noll {Pennsylvania Sta. Rpt. 1915, pp. 34-^6). — 

 In continuation of work previously noted (E. S. R., 17, p. 1057; 23, p. 139), this 

 reports the results of variety tests with potatoes for 1910-1914, inclusive, to- 

 gether with observations on the length of the growing period of a number of 

 potato varieties, and on tlie shrinkage of different varieties in storage. Variety 

 tests for each year of the .5-year period are noted separately, the data tabulated, 

 and the results summarized. 



The highest average yield of 32 varieties grown each of the five years reported 

 was obtained from Snow and amounted to 210.5 bu. per acre of marketable 

 tubers. Whiton White Mammoth and Heath Late Surprise, with yields of 202.3 

 and 198.5 bu. per acre, were second and third, respectively. 



The number of days from the date of planting to the date at which the tops 

 were considered dead, together with the average yields of 32 varieties from 1910 

 to 1914, are reported. The varieties were divided into two groups of 16 each, 

 the average length of the growing period for the first group being 107 days, with 

 an average yield of 149 bu. per acre, and of the second group 127 days, with an 

 average yield of 183.7 bu. 



Shrinkage experiments included observations on 26 varieties from October 

 22 to April 23. The total shrinkage varied from 7.88 per cent for Manistee to 

 14.32 per cent for Petoskey, and averaged 10 per cent. 



Potato grades recommended by the United States Department of Agricul- 

 ture and the United States Food Administration ( U. S. Dept. Agr., Bur. Mar- 

 kets Doc. 7 (1917), pp. 4). — Potato grades known as U. S. Grade No. 1 and U. S. 

 Grade No. 2 are briefly described and their adoption urged to meet the require- 

 ments of the recent ruling of the Federal Reserve Board authorizing member 

 banks to make loans against warehouse receipts for potatoes properly graded, 

 packed, stored, and insured, as well as to meet the needs of growers, dealers, 

 and consumers. 



Rice in the Americas (Bui. Pan Ainer. Union, 44 {1917), No. 2, pp. 1S7-160, 

 figs. 2S). — A historical and economic review of rice production in North and 

 South America, including a discussion of the cultivation of the Zizania species 

 known as " wild rice " by the native Indian tribes of North America. The first 

 introduction of cultivated rice in the Americas seems to have been in Brazil 

 during the sixteenth century. Statistics are given on the value of the crop in 

 the various countries of the Pan American Union. 



The soy hean in New Hampshire, F. S. Peince {New Hampshire Sta. Bui. 

 181 {1917), pp. 20, figs. 7). — The adaptation and uses of the soy bean in New 

 Hampshire are discussed and the field practices and cultural methods employed 

 in growing the crop for forage outlined. 



Tests with inoculated and uninoculated soy bean plants in 1915 gave yields 

 of green forage amounting to 7.192 and 4.672 tons per acre, respectively. An 

 average yield of 16,617 lbs. of green forage per acre was obtained from 16 

 varieties grown at the station, varying from 7,826 lbs. for Wisconsin Early Black 

 to 20,253 lbs. per acre for Haberlandt. An analysis of 5 varieties of corn showed 

 an average yield in dry matter of 5,751 lbs. and in protein of 4G3 lbs. per acre. 



