338 EXPERIMENT STATION RECORD. [Vol. 37 



if manure is scarce 4 or 5 tons supplemented with 400 lbs. of arid phosphate 

 and 100 lbs. of nitrate of soda be used. 



Potato growing, S. N. Green {Mo. Bui. Ohio Sta., 2 (1917), No. 5, pp. 147- 

 152, figs. 2). — The factors tending toward larger yields of potatoes under more 

 intensive cultural methods are discussed. The seeding of small tubers (less 

 than 2 oz.) gave an increase of 5.7 bu. per acre over the check (cut pieces of 

 2 oz.) as compared with an increase of 17.5 bu. from large (more than 6 oz.) 

 tubers. This indicates that potato culls can be profitably utilized for seed, 

 although their continued selection for seed is not recommended. The use of 

 potato eyes only for seed is considered practicable under intensive cultural 

 methods. 



The yields from seven different planting dates ranging- from May 17 to June 

 30 are compared with those of plantings made May 10 as a check. The May 17 

 planting gave an increase of 12.4 bu. per acre, while each succeeding planting 

 gave decreased yields as compared \\ith the checks ranging from 4.5 bu. for 

 the plantings of May 24 to 44.8 bu. for those of June 30. Where late plantings 

 were unavoidable the yields were greatly increased by exposing the bud end 

 of the seed stock to a partial light, allowing short, green sprouts to develop. 

 Plantings on June 30 from such seed yielded only 4.3 bu. le.ss than plantings 

 made May 10. 



The 2-year average yields of marketable tubers of 41 varieties grown at 

 Wooster and considered suitable for intensive culture are reported in tabular 

 form. The average yields varied from 71.9 bu. for Eureka Extra Early, a 

 Cobbler type, to 287.1 bu. for Livingston, a Rose type. 



Potato growing in the loess area of the southwest. A, P. Zapobozhenko 

 {Kiev. Agron. Obshch., Trudy Kom. Izuch. Khoz. lugo-Zapad. Kratd, 4 {1915), 

 pp. 1-118). — This is a detailed study of potato growing in the loess area of 

 southwestern Russia. The cost of production has been determined in detail 

 for a number of individual producers, and the results indicate a considerable 

 lack of uniformity in the cultivation of the crop. The author concludes that 

 the present type of potato culture in this region is not dependent on soil con- 

 ditions and that it can be materially altered. 



Fertilization of rice, C. Balangue y Rulloda {Philippine Agr. and Forester, 

 5 (1916), No. 5, pp. I.'f4-158). — Fertilizer trials are reported with upland and 

 lowland rice at three centers in the Philippines, using wood, grass, and rice 

 ashes ; stable manure ; acid phosphate ; ammonium sulphate, and lime. The 

 results obtained from the various fields are reported in tabular form and dis- 

 cussed. Simple systems of fertilization of both upland and lowland rice were 

 found profitable. Stable manure proved to be the best of the locally avail- 

 able fertilizers, with ashes next, and a combination of stable manure and 

 ashes giving good results. Liming increased production, especially on the 

 "old" fields. 



Grain sorghums, B. A. Madson {Calif omia Sta. Bui. 278 {1917). pp. 227-250, 

 figs. 6). — The adaptation, production, and value of the grain sorghums in Cali- 

 fornia are discussed in detail. 



Variety tests for grain production were conducted at Davis from 1913 to 

 1916, inclusive, with 6 varieties of durras, 6 of Kafir corn, 4 of kaoliangs, 

 and 1 of shallu. The highest average yield per acre was obtained from Dwarf 

 milo maize, 3.575 lbs. Of the Kafir corns. Dwarf BlackhuU was first with 1,962 

 lbs., and of the kaoliangs Brown with 2,962 lbs. Shallu averaged 3,542 lbs. 



The highest average yield of both grain and stalk for 1914 and 1915, of the 

 seven kinds most suitable for forage purposes, was secured from BlackhuU 

 ^Yllite Kafir corn, 16.06 tons per acre, with feterita lowest, with 7.01 tons. 



