162 AGRONOMY [Bot. Absts., Vol. V, 



1191. Pammel, L. H., and C. M. King. An annual white sweet clover. Proc. Iowa Acad. 

 Sci. 25: 249-251. PI. 4-6. 1920. — Origin and history of an annual strain of Melilotus alba 

 found at Ames, Iowa. — H. S. Conard. 



1192. Pammel, L. H., and C. M. King. Test your clover and timothy seed. Iowa Agric. 

 Exp. Sta. Circ. 59. 2 p. 1919. 



1193. Pammel, L. H., and C. M. King. Johnson grass as a weed in southwestern Iowa. 

 Iowa Agric. Exp. Sta. Circ. 55. 4 P-> 3 fig. 1919. — Johnson grass has become established in 

 southern Iowa, and promises to become a menace to the farmers. A brief discussion is given, 

 including a botanical description of the grass and seed, together with methods of extermi- 

 nation. — Florence Willey. 



1194. Pavoni, P. A. El cultivo de la higuerilla. [Cultivation of the castor bean.] Jalisco 

 Rural [Mexico] 2 : 41-45. 1919. — A compiled account of the cultivation of the castor bean. — 

 John A. Stevenson. 



1195. Pieper, H. Beschreibung einer Methode zur raschen Erkennung von Futterruben- 

 samen im Zuckerriibensamen. [The description of a method for rapid differentiation between 

 stock beet seed and sugar beet seed.] Zeitschr. Vereins Deutsch. Zucker-Indust. 766: 409- 

 418. 1919. 



1196. Pitt, J. M. Farmers' experiment plots. Winter green fodder exepriments, 1919. 

 Agric. Gaz. New South Wales 31: 7-12. 8 fig. 1920. — Soiling crops are recommended for 

 winter and spring in the Central Coast district, as dry weather invariably occurs. Cultural 

 details and yield results are given for 10 localities (or less) for 8 varieties of wheat, 5 of oats 

 and vetches and peas in combination with wheat or oats. The maximum yield of over 21 tons 

 was secured from Thew wheat and peas. — L. R. Waldron. 



1197. Pitt, J. M., and R. W. McDiarmid. Farmers' experiment plots. Maize experi- 

 ments, 1918-19. Agric. Gaz. New South Wales 31: 99-105. 1920.— Different varieties, with 

 and without phosphatic manures, were grown at various localities in the Central Coastal dis- 

 trict. The use of manures generally showed profits. The Improved Yellow Dent gave a 

 maximum yield of 125 bushels per acre. Light yields were secured in the Northern districts. 

 — L. R. Waldron. 



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1198. Powers, W. L., and W. W. Johnston. The improvement and irrigation require- 

 ment of wild meadow and tule land. Oregon Agric. Exp. Sta. Bull. 167. 44 P-,25 fig. 1920. — 

 There are more than 515,000 acres of wild meadow and tule land in eastern Oregon, the former 

 comprising more than one-third of the irrigated area of the state. The chief vegetation 

 in the peat swamps consists of tules and flags, mingled with wire grass and sugar grass, 

 while the chief meadow grasses are redtop, blue-joint, meadow grass and wild clover. In 

 the Chewaucan Basin alsike clover and timothy have yielded 3{- tons an acre as compared to 

 1 ton of native grass on adjoining land. Alfalfa in the Harney Basin has produced about 2 

 tons an acre, while native wild hay has averaged but $ ton an acre. In the Fort Klamath 

 region alsike clover and timothy have yielded more than double the amount of forage pro- 

 duced by native grasses. Results from 5 years experiments have shown that an average depth 

 of 18 inches of water on the field could produce the maximum yield now obtained, while an 

 average of 12 inches has given the largest yield per acre per inch of water used. The average 

 cost for the production of wild hay has been nearly double that required for alsike clover and 

 timothy. Marked increases in yield of alfalfa have been secured from an application of sul- 

 fur to swamp border soils. — E. J. Kraus. 



1199. Ramsay, J. T. Is change of seed necessary in the cultivation of potatoes? Jour. 

 Dept. Agric. Victoria 17: 651-657. 1919. — The selection of home grown seed potatoes has 

 given as good results as imported seed potatoes. — J. J. Skinner. 



