FIELD CROPS. 137 



37.G bu. of prime tubers and oG.S bii. of culls. Fall-harvested seed gave better 

 results than summer-harvested tubers. 



A comi)arisou of different sized tubers of summer aud fall-harvested seed 

 crops graded into egg, walnut, and marble size, showed that the egg size pro- 

 duced the best yield, being followed by the walnut and the marble size in the 

 order mentioned. The seed end surpassed the stem end in Maine grown seed 

 by 22 bu. and 19 bu. per acre for Eaily Rose and Sir Walter Raleigh, respec- 

 tively. In the case of home-grown seed the corresponding figures were 44 bu. 

 and 24 bu. per acre. 



A test is reported of 27 American varieties of northern seed, IT varieties of 

 French, and 8 varieties of German seed planted in 1905. To these were added 

 21 varieties in 1906. The results showed the following varieties as leading in 

 yield : Early varieties, Irish Cobbler, Noroton Beauty, Clark Pride, Early Ohio, 

 and Early Six Weeks; medium-maturing varieties, Green Mountain, Rural New 

 Yoi-ker, Planet, Sir Walter Raleigh, Early Thoroughbred, Early Reliance, Pat's 

 Choice, Montana Prizetaker, White Elephant, State of Maine, Six Weeks, Man- 

 istee, aud Early Rose; late varieties. Blue Peerless, Blush, Clinton, Canada, 

 Pride of America, McCormick, Oom Paul, Agnelli, and Banner. 



Potato experiments and studies, A. R. Kohler {Minnesota Sta. Bui. llJf, 

 pp. 287-333, figs. 2). — ^About 110 varieties of potatoes, including varieties and 

 species from Mexico, South America, and Europe, were on trial at University 

 Farm in 1908. Tlie results secured are tabulated and descriptions and notes 

 are given on 63 of the more important varieties. A tentative classification of 

 varieties into eleven groups is presented. 



In total yield in 1908 Factor led with 205.3 bu. per acre, being followed by 

 Freeman with 203.7 bu. In yield of marketable potatoes Freeman stood first 

 with 193.5 bu. per acre and Factor next with 168.1 bu. Among varieties tested 

 3 years or more since 1900, Bartlett stood first in average rank. Acme second, 

 and White Beauty third. 



In a comparison of old and new seed stock of 7 varieties, made in 1908, the re- 

 sults with the new stock ranged :ti'om a loss of 7.5 bu. of marketable tubers per 

 acre to a gain of 105.1 bu. with an average gain of 45.1 bu. With only one excep- 

 tion the tubers of the new stock were larger than those of the old stock. The 

 amount, uniformity, and density of growth of the plants was also in favor of 

 the new stock. The foliage of the plants from the new stock remained green 

 longer in most cases than that of the old stock plants. 



An experiment with different quantities of seed per acre (ranging from 5 to 

 60 bu.) showed that the use of 11 bu. was the most profitable. The use of badly 

 diseased tubers for seed reduced the yield quite extensively and planting even 

 slightly diseased tubers resulted in a loss. In 1908 the increase in the yield 

 of marketable potatoes per acre as apparently due to spraying with Bordeaux 

 mixture was as follows : Spraying 6 times 18.7 bu., spraying 4 times 15.8 bu., 

 spraying 3 times S.4 bu., while spraying 2 times gave a slight loss. 



Potato growing- for Minnesota, A. R. Kohler (Minnesota Sta. Bui. ll'u 

 l)p. 33Jf-362, figs. //). — This article is a brief treatise on the culture of the 

 potato in Minnesota. Potato crop statistics and methods for the control of the 

 potato beetle and of the diseases which attack the plant are given in addition to 

 cultural directions and suggestions for keeping up the seed stock. 



Experiments with potatoes 1906-1908, W. Bruce {Edinh. and East of Scot. 

 Col. Agr. Bui. 17. />/>. .?'/). — Amonsi the best varieties of potatoes grown were 

 Midlothian Early, Sharpe Express Conquest, Cottar, Dalnieny Acme, Factor, 

 Dalhousie, What's Wanted, and Laugworthy. The two varieties last mentioned 



