736 EXPERIMENT STATION RECORD. 



from the check ph\ts. Selections made at Grandview showed approximately 

 as much nitrogen in wheat grown with 20 in. of irrigation water as in wlieat 

 grown with smaller quantities. Results in 1914 indicated that winter wheat 

 can be gi-own with a nitrogen content as high as that found in spring grown 

 crops. The percentage of nitrogen in wheat grown at Ilitzville was higher 

 than in wheat grown at Pullman, which is ascribed to the more irregular 

 growth and the poorer stand of some of the varieties grown at Ritzville as com- 

 pared with the Pullman crop. 



Farm crop report, E. B. Stooket (Washington Sta., West. Wash. Sta., Mo. 

 Bui., 3 (1016), No. 11, pp. 5-9), — Brief popular notes are given on variety and 

 crop tests with cereals, clovers, and other legumes, grasses, and miscellaneous 

 forage crops. 



Cover crops for Porto Rico, C. F. Kinman (Porto Riro Sta. Bui. 10, pp. 32, 

 pis. S). — This bulletin discusses the selection of cover crops to meet the condi- 

 tions of the climate and the requirements of the crops of Porto Rico more 

 especially citrus fruits, coconuts, and pineapples; describes in general the re- 

 sults obtained with different plants grown as cover crops ; and enumerates the 

 plants which the station recommends for the purpose, together with a number 

 of wild leguminous plants considered of value in this connection. Descriptive 

 and cultural notes are given of the co^vpea (Vigna sinensis), jack beau (Cana- 

 vali ensiformis), sword bean (C. ylndiata), I-yon bean (Stizolohiuni niveiou), 

 Bengal or Mauritiiis bean (S. atcrrimum), S. cinereum, .9. velntinum, Florida 

 velvet bean (S. (Jcrriufiiaviim), and the pigeon pea or gandul (Cajnnus iuflirus) 

 as cover crops for Porto Rico; and of mani cimarrona (Chama^crista diphijlla), 

 matraca (Crotalaria rctusa), zarzabacoa gahma (Drsmodiiiin a(l<<e(nfl(ns), 

 zarzabacoa comGn (D. tnranHm), habichuela cimarrona (Phascolus adenanthus), 

 yerba rosario (J^schynomenc americann), conchita peluda (Centrosema pubes- 

 cens), tamarindillo (Cassia chama-crista). habichuela parada (P. scmierertns), 

 and mato de la playa (Cnnarali ohtiisifolia) as wild legimiinous plants valuable 

 for orchards or other cultivated lands, and worthy of protection and in some in- 

 stances of cultivation. 



Thinning experiments with potatoes, O. B. Wiiipi'le (Montana Sta. Bui. JOG, 

 pp. 3-8, /iff. 1). — A preliminary report is presented on thinning experiments with 

 potatoes grown with and without irrigation. Tlie plants were thinned the lirst 

 two weeks of July to the strongest plant in the hill. The greatest apparent 

 benefit derived from thinning was the decrease in the amount of culls. Although 

 the total yield and the yield of marketable tubers was gi-eatest from the un- 

 thinned rows, the quality of the tubers with reference to size and uniformity 

 was better from the thinned crop. 



Seed inspection (Maine Sta. Off. Jnsp. 73 (1915), pp. ifl7-224).— Tables are 

 given showing the results of the examination of samples of seeds collected in 

 the spring of 1915, together with a list of the weed seeils found. 



Weeds, J. C. Akthur (Indiana Sta. Rpt. 1915. pp. 31, 32).— Brief notes on 

 cooperative and demonstration work in the control of wild garlic and Canada 

 thistle by means of spraying with orchard heating oil, red sorrel by sulphate of 

 iron, and of other weeds by the use of a proprietary weed destroyer, are given. 

 A study of weed seeds in the soil was made by taking several samples of soil 

 from different fields and placing them in the greenhouse. In one sample which 

 contained a cubic foot of soil 3G3 plants came up, and in another 342 plnnts. In 

 soil from a carefully cultivated field a much smaller number of seeds was found 

 than in one from poorly cultivated ground. Most of the weed seetls were 

 found in the upper G in. of the soil. 



