52 EXPEEIMENT STATION RECORD. [Vol.36 



grown in sand and the nutrient solution liept constant, renewed, or modified 

 almost as readily as in water cultures. 



Preliminary revision of the genus Inga, H. Pittiek (U. S. Nat. Mtis., Con- 

 trib. Nat. Herbarium, 18 {1916), pt. 5, pp. n3-223+XI, pis. 25).— A preliminary 

 revision of the genus Inga, many of the species of which are important 

 leguminous trees, is given. A considerable number of new species are described. 



FIELD CROPS. 



[Field crops work at the Canada stations and farms in 1914, J. H. Grisdale 

 ET AL. {Canada Expt. Farms Rpts. 1915, pp. 618, 619, 673, 674, 692-694, 703, 736- 

 741, 747, 751, 760-762, 773, 774, 787, 788, 796, 801-S03, 813, 8I4, 84I, 847, 854, 855, 

 867-947, 1015-1100, 1153-1191, 1193-1210, pis. 7).— A. report of the continuation 

 of work previously noted (E. S. R., 33, p. 728) and a detailed account of work 

 already mentioned (E. S. R., 33, p. 34), including mainly variety and cultural 

 tests with grain and forage crops, flax, potatoes, and tobacco. 



Variety and cultural tests were conducted with winter and spring wheat, 

 ennner, spelt, oats, barley, winter and spring rye, i>eas, beans, flax, and buck- 

 wheat at the experiment stations, substations, and farms in Ontario, Prince 

 Edward Island, Nova Scotia, Quebec, Manitoba, Saskatchewan, Alberta, and 

 British Columbia. The results obtained are presented in tables with brief 

 comments. Similar work in the same localities with forage crops included tests 

 of corn for grain and silage, peas and oats for forage, timothy and clover for 

 hay and for seed, grass and clover mixtures, vetches, orchard grass, western 

 rye grass, red fescue, redtop, awnless brome grass, and other grasses, annual 

 hay crops including different kinds of millet, alfalfa, sainfoin, clovers, turnips, 

 mangolds, carrots, and sugar beets. 



Results of variety and culture tests with tobacco and of observations on seed 

 bed management conducted in the Provinces of Ontario and Quebec are reported 

 in tabular form and described, and notes are given on the harvesting and 

 curing and on the different varieties entering into the trials. The work on 

 seed bed management has been noted from anotlior source (E. S. R., 35, p. 233). 

 In a fertilizer experiment the maximum yields of l,r)37 lbs. each per acre were 

 obtained on plats receiving 250 lbs. of sulphate of ammonia, 180 lbs. of sulphate 

 of potash, and 100 lbs. of superphosphate; and 250 lbs. of sulphate of ammonia, 

 150 lbs. of sulphate of potash, and 80 lbs. of supei'phosphate per acre. It is 

 concluded that nitrogen and potash are the important elements and that only 

 a comparatively small quantity of phosphoric acid is required on the soils under 

 test. 



The nicotine content of the different varieties of tobacco under experiment, 

 as determined at the tobacco station at Farnham, Quebec, is reported in a 

 table, together with the results of soil analyses for the different plats on which 

 the tobacco was grown. The tobacco station at Harrow, Ontario, tested rye, 

 hairy vetch, and clover as cover crops in connection with tobacco culture, and 

 studied the use of fertilizers and the value of soil disinfection in seed bed 

 management. A combination of nitrate of soda, sulphate of potash, and super- 

 phosphate mixed in equal proportions by weight and applied at the rate of 

 0.1 of a lb. per square foot gave excellent results as a plant-bed fertilizer. 

 Sowing Burley beds on the same area for more than one or two years was 

 found unsatisfactory unless the soil had been changed or sterilized. A cold 

 bed with glass covering gave plants about ten days earlier than a cold bed with 

 cotton covering. A test carried on at Walkerville, Ontario, gave no conclusive 

 evidence in favor of the use of acid phosphate as a means of controlling root 

 rot. 



