636 EXPERIMENT STATION RECORD. 



material is needed in the growth of peas. For the prodnction of hay, nitro- 

 gen alone, potash alone, and nitrogen and potash combined produced only 

 slight increases in yield and those at an economic loss. Neither nitrogen nor 

 potash when mixed with phosphoric acid produced larger yields than phos- 

 phoric acid alone. 



In a variety test conducted during the period 1903-1908, the Whittle variety 

 produced the highest average yields of 13.5 bu. per acre, while Iron stood first 

 in yield of hay with 3,872 lbs. per acre, but eighth in yield of peas with 9.9 bu. 

 per acre. In a test of plantrngs made at the rates of 1, 2, 3, 4, and 6 pks. in 

 drills 34 ft, apart, the highest yield of hay, 3,000 lbs. per acre, followed the 

 planting of 2 pks., but the highest yield of peas, 8.22 bu., was secured by 

 planting 6 pks. per acre. Full directions are given for production of cowpeas 

 in different types of land in North Carolina and for utilizing the crop. 



[Analyses of some Helianthi] (Bol. Min. Agr., Indus, e Com. {Romc\, 9 

 (1910), So: C, No. 2, p. 3). — Analyses are given of the Jerusalem artichoke, 

 HclianfJiiis doroicoidcs, and H. dccapctalns. 



The manioc, E. Lisboa (Lavoiira; Bol. Soc. Nac. Agr. {Brazil]. 1 't (1910), 

 No. 2, pp. 59-69, pis. i). — Analyses of the parts of the plants and its products 

 are followed by directions for the jn-oduction of the crop. A bibliography of 

 French and Spanish works is given. 



Ten years' experience with the Swedish Select oat, M. A. Carleton ( U. S. 

 Dept. Agr., Bur. Plant Indus. Bui. 1S2, pp. 47, pis. li, figs. 4). — A brief history 

 of the introduction of the Swedish Select oat is followed by an account of 

 cooperative tests by experiment stations. 



In Wisconsin, 100 farmers reported in 1903 average yields of 44 bu. per acre 

 as compared with 37.5 from other varieties. In 1904, 30 men reported yields 

 of 45 and 40 bu. respectively, while in 1907, 96 reported yields of 27.9 and 24.3 

 bu. per acre respectively, and in 61 cases the oats were badly rusted. At the 

 experiment station the average yield from Swedish Select during 1899-1908 

 was 50.8 bu. as compared with an average of all other varieties of 42.3 and 

 an average yield of oats in the State of 33.4 bu. per acre. During 1900-1907, 

 omitting the year 1905. Swedish Select, Big Four, Siberian, and Silver Mine 

 produced average yields of 60.2, 40.3, 45.1, and 45 bu. per acre, respectively. 

 During 1900-1908, Swedish Select, Silver Mine, and Early Gothland averaged 

 57.9, 44.9, and 43.3 bu. per acre, respectively. 



At the North Dakota Station during 1899-1908, omitting 1901 and 1905, the 

 8-year average yield of Swedish Select was 53.2, the average yield of all other 

 varieties grown at the station 55.7, and the average North Dakota oat yield 28 

 bu. per acre. At the Montana Station, Swedish Select stood fifth in yield in 

 a test of 6 varieties. Mogheda, American White, American Beauty, and Arch- 

 angel produced average yields ranging from 106.9 to 109.8 bu. per aci'e during 

 1900-1904. At the South I^akota Station. Swedish Select and Tobolsk averaged 

 43.67 and 35.91 bu. per acre during the period 1899-1908. During 1901-1908, 

 Sixty-Day averaged 59.96 bu. per acre. At the Highmore Substation, Swedish 

 Select and Sixty-Day averaged 44.7 and 40.2 bu. per acre, respectively, during 

 1903-1909. 



At the Washington Station, Swedish Select yielded 55 bu. in 1903. 86 bu. in 

 1904, and 53 bu. in 1905 as compared with 82.5 and 84 bu. respectively during 

 the last 2 years yielded by its strongest rivals. At the Colorado Station, the 

 yield during 1905-1907 averaged 88.4 bu. as compared with 86.8 for all other 

 varieties. At the Cheyenne Wells substation, the yield in 1900 was 18 bu. per 

 acre. 



At the Iowa Station during 1905-1908, Kherson, Silver Mine, Swedish Select. 

 and Sixty-Day averaged 60.2, 56, 50.5. and 4S.7 Ini. per acre respectively in 



