1919] FIELD CROPS. 327 



New species of Uredinete, X, J. C. Autiu B (Bui. Torrey Bot. Club, \5 {1918), 

 No. 4, pp. 141-156) . — Thia descriptive list comprises _'."» new species and 2 aew 

 combinations. The species are all North American, ranging from Wyoming 

 and Vermont to Panama and the West Indies, the'greater part being from 

 Mexico and Central America. 



Uredinales of Guatemala based on collections by K W. D. Holway, I, 

 J. 0. Arthur (Amer. Jour. Hot., 5 (1918), No. 6, pp. 825-886). — Notes and de- 

 scriptions are given of species of Coleosporiacesc and Uredlnacea? collected in 

 Guatemala during the period from 1914 to 1917, inclusive. 



Inventory of seeds and plants imported by the Office of Foreign Seed and 

 Plant Introduction during- the period from October 1 to December 31, 1915 

 {V. 8. Dept. Agr., Bur. Plant Indus. Inventory No. 45 (191S), pp. 66, pis. 7).— 

 A list is given of 370 lots of seeds and plants introduced during the period from 

 October 1 to December 31, 1915. the material collected by O. F. Cook In the 

 high Peruvian Andes while attached to the Yale University-National Geo- 

 graphic Society expedition being included. 



FIELD CROPS. 



[Report of agronomy work at the Guam Station], G. Brtggs (Ouam Sta. 

 Rpt. W17, pp. 17-29. pis. 2). — This describes the continuation of work with 

 field crops as previously uoted (E. S. R., 37, p. 728). 



In a comparison of different treatments for renovating Para grass {Panicum 

 barbinodc) areas, the heaviest yield of green forage, amounting to 132,257 lbs. 

 per acre, followed an application of 15 tons of barnyard manure, as compared 

 with an average yield of 4S.481 lbs. from two untreated checks. The grass is 

 said to be best suited to lowland pastures and to require a rest period at cer- 

 tain intervals throughout the year. Paspalum dilatatum continued to give ex- 

 cellent results as a pasture grass under droughty conditions and on many types 

 of soil. Plantings made 12 in. each way with sod cut into 2-in. squares have 

 given the best results. The necessity for allowing both Paspalum and Para 

 grass to become well established before pasturing is emphasized. 



The first successful introduction of Sudan grass into Guam was made during 

 the year. The first crop, produced during the dry season, was harvested 10S 

 clays after planting, the yield being 9.83 tons of forage per acre. 



Two fields of Amber cane sorghum planted in January yielded at the rate of 

 S and 8.5 tons of forage per acre, respectively, at the first cutting and 5.92 anil 

 10.4 tons at the second cutting. Kafir corn produced 10.5 tons of forage the 

 first cutting and 31.65 bu. of grain per acre, and 7.9S tons of forage from the 

 first ratoon crop. Limited data are thought to show a direct correlation be- 

 tween season, or time of planting, and the yield and number of days required 

 to reach maturity for the grain sorghums. During the wet Beason the crop 

 matures in less time but the yields are materially lower than in the dry season. 



The fourth and fifth generations of corn obtained in improvement work with 

 a native white variety matured during 1!>17. The fourth generation crop is 

 described as quite satisfactory, maturing several days earlier than the original 

 stock and producing an average of 37 bu. per acre, as compared with less than 

 •_'."> bu. for the native kind. The fifth generation was practically a failure. 



Results obtained in fertilizer, shading, and Insect enemy studies with 

 tobacco are held to indicate that insect control is the most important factor 

 in producing marketable tobacco. Shading tobacco was found to be detri- 

 mental as well as unprofitable, while treatment with lead arsenate resulted in 

 larger yields and a better grade. The results of the fertilizer iest< for the past 

 two years were so conflicting that no definite conclusions have been reached. 



