FIELD CROPS. 637 



Jfdl, figs. 6). — An account is given of a series of measurements of the relative 

 rates of evaporation in certain plant associations made during June and July, 

 1910. The authors used porous clay atmometers for determining the differ- 

 ences in evaporation, and it was found that the differences in the various asso- 

 ciations are due chiefly to the nature of the vegetation, which by its size and 

 density controls the evaporation beneath it. It is claimed that successions 

 between associations are not caused by any conditions of evaporation, and that 

 the more primitive associations have the higher rates of evaporation, while 

 those most nearly like the climax type have the lowest rates. This is held to 

 be true not only for forest associations but also for prairie associations, which 

 are correlated with an arid climate and consequently high climatic evaporation. 

 Seeds and plants imported during' the period from July 1 to September 30, 

 1911— Inventory No. 28 (U.S. Dept.Agr., Bur. Plant Indus. Bui. 21^8, pp.11).— 

 This gives a list with descriptive notes of seeds and plants imported during 

 the period mentioned, more than 500 items being included. A large portion of 

 the material was obtained by Mr. F. N. Meyer in Chinese Turkestan, and the 

 balance from miscellaneous sources. 



FIELD CROPS. 



Eesults obtained in 1911 on the Dominion experimental farms from trial 

 plats of grain, fodder corn, field roots, and potatoes, C. E. Saunders {Canada 

 Cent. Expt. Farm Bui. 11, 1911, pp. 14). — Results of a large number of experi- 

 ments conducted at the experimental farms during the season of 1911 with 

 important varieties of wheat, oats, barley, peas, corn, turnips, mangels, carrots, 

 sugar beets, and potatoes are presented. The results show marked differences 

 in earliness and in the relative productiveness of varieties even when grown 

 under similar conditions. Lists of recommended varieties of the different 

 crops suitable for the different provinces or districts are given. The publication 

 of data as to the average yields obtained during a series of years, as noted in 

 previous bulletins (E. S. R., 24, p. 435), has been discontinued. 



Second report on experiments, botanical experiment station, Salisbury, 

 1910-11, J. H. Hampton (Rhodesia Agr. Jour., 8 (1911), No. 6, pp. 853-862; 9 

 (1911), No. 1, pp. 16-23, pis. 4). — Moderately satisfactory results were obtained 

 with dry-land alfalfa. Egyptian clover, velvet beans, cowpeas, lupines, ground 

 nuts, sweet potatoes, wheat, oats, Teff grass (Eragrostis at)yssinica) , teosinte. 

 sugar cane, and various millets were tested for summer forage. Velvet beans 

 yielded 3,680 lbs. of cured hay per acre and proved more satisfactory than 

 cowpeas. Only the Black-eyed Susan and Iron cowpeas gave satisfactory- 

 results. American peanuts and sweet potatoes proved superior to the native 

 varieties. Other crops discussed are flax, mangels, sugar beets, swedes, kohl- 

 rabi, carrots, rape, beans, and peas. 



Annual report of the experimental work of tlie Bankipore Agricultural 

 Station, 1910-11 (Ann. Rpf. Bankipore Agr. Sta. [Bengal], 1910-11, pp. 10).— 

 Two rice seedlings per hole gave greater yields of grain and straw than plant- 

 ings of 1, 4, or 8 seedlings per hole. Green manuring with sann hemp was 

 followed by somewhat greater yields of rice and straw than green manuring 

 v/ith dhaincha, and both by much greater yields than from the unmanured 

 plats. Other work reported includes variety and fertilizer tests with rice and 

 a fertilizer test with sugar cane. 



Annual report of the Cuttack Experimental Farm, 1910-11, A. C. Dobbs 

 (Ann. Rpt. Cuttack Agr. Sta. [Bengal]. 1910-11, pp. 11). — Transplanting rice 

 at the rate of 1 seedling per hole gave a greater 5 years' average yield than 

 transplanting at the rate of 2, 3, or 4 seedlings. Other work reported includes 



