FIELD CROPS. 637 



noted (E. S. R. 22 p. 337). The work done at St. Jacques and St. Cesaire is 

 described in detail. Hybrid, Comstock, and Sumatra produced tlie liigliest 

 yields, 1,875, 980, and 875 lbs. per acre, respectively. In a fertilizer test tlie 

 maximum yield of 1,128 lbs. per acre followed the application of 500 lbs. of 

 sulphate of ammonia, 300 lbs. each of sulphate of potash and superphosphate, 

 and 15 tons of farmyard manure, per acre. The same mixture without super- 

 phosphate yielded 1,026 lbs. Notes are given on the plant characteristics and 

 the yields of the different varieties grown. The Big Ohio yielded over 2,000 

 lbs. per acre, and will be further tested. 



III. Experimental tvork carried on in 1909, W. A. Barnet. — In a test of 6 

 varieties, Reid Yellow Dent produced the maximum corn yield of more than 135 

 bu. per acre. Oats proved ill adapted to the soils, and were replaced by wheat, 

 which proved the better nurse crop for clover. 



Plant bed work indicates that cigar varieties were ready for transplanting 

 from 5 to 8 days earlier than others. Virginia type beds had to be changed 

 from a cotton to a glass covering to obtain sufficiently early plants. Nitrate of 

 soda stimulated plant growth successfully, especially in the final stages, but did 

 not benefit germination. The temperature ranged from 9 to 27° F. higher under 

 glass than under cotton, notably in the afternoon. An application of 625 lbs. 

 of sulphate of ammonia, 375 lbs. each of sulphate of potash and superphosphate, 

 and 15 tons of manure per acre was followed by a yield of 2,424 lbs. of tobacco 

 per acre, or more than twice that grown on the check plat. Less than 18 lbs. 

 difference in yield followed the use of 375 lbs. sulphate of potash instead of 

 625 lbs. sulphate of ammonia, each being used with 375 lbs. superphosphate. In 

 curing experiments the process was completed with yellow tobacco in from 

 3 to 5 days by artificial heat. Formulas are given for guidance in curing yellow 

 and Burley tobaccos. 



Tobacco growing in British Columbia, F. Charlan (Canada Dept. Agr., 

 Tobacco Div. Bui. AlO, pp. 13). — This bulletin contains suggestions for pro- 

 spective tobacco growers in British Columbia. 



Notes on the history and changes of varieties of tobacco m Cuba, 

 A. Ponce de Leon (Estac. Erpt. Agron. Cuba Circ. 38, pp. 19-3Ji, pis. 4)- — The 

 author gives historical and botanical notes on each of a number of Cuban 

 tobaccos, and states the relative frequence of their occurrence in the tobacco 

 fields. 



How to increase the yield of wheat in California, G. W. Shaw (California 

 8ta. Bui. 211, pp. 255-316, figs. 28). — This bulletin summarizes field and lab- 

 oratory investigations of cereal growing at the California cereal stations at 

 Tulare, Davis, and Ceres, covering several years and in part in cooperation 

 with the Bureau of Plant Industry of this Department. 



In 40 trials conducted during 3 years on the university farm at Davis with 

 the average precipitation about 20 in., deep plowing has produced a higher 

 wheat yield than shallow plowing by 8.11 bu. per acre, a percentage increase of 

 37.40. The barley yield was increased 6.68 bu. per acre or 9.70 per cent, and 

 the succeeding barley crop 8.04 bu. per acre or 46.50 per cent. The importance 

 of summer fallow and a well prepared seed bed are emphasized. Disking as a 

 preparation for spring seeding resulted in a yield of 3.1 bu. per acre more 

 barley than plowing. 



In experiments testing the effect of deep plowing and green manuring the 

 land was plowed about 8 in. deep at the time of turning under the crop, then 

 either disked or treated with the subsurface packer. The principal results are 

 stated in the following table: 



