FIELD CROPS. 643 



author summarizes some work of others upon this subject. In his own experi- 

 nientg he found that the weight per plant of the leaves of the fehaded samples 

 selected ranged from 188 to 198 gm., as compared with from 221 to 504 gm. in 

 case of the unshaded samples. The weights per root ranged from 51.6 to 81.6 

 gm. and from 202.3 to 743 gm. in case of the shaded and unshaded beets, respect- 

 ively. The leaf weight was from almost 24 to about BJ times as great as the 

 root weight of the shaded samples and from about i to I2 times as great as the 

 root weight in case of the unshaded samples. The sugar content of the shade- 

 grown roots averaged 13.9 per cent, while that of the unshaded roots ranged 

 from 10.8 to 12.9 per cent. The sugar production per shade-grown root averaged 

 9.2 gm. but ranged from 25.5 to 85.4 gm. in case of the unshaded roots. 



The author presents computations from the work of Briem which indicate 

 that the shade-grown roots had a gi'eater average leaf weight and a much 

 smaller average root weight than did the unshaded beets. The work of Stroh- 

 mer verified this result, and indicated a somewhat lower average sugar content 

 in case of the shade-grown beets and a much lower sugar production per beet. 



Other work on this subject has already been noted (E. S. R., 25, p. 236). 



[Manganese as a sugar beet fertilizer], E. Zacharewicz (Rev. Vit., 37 

 (1912), No. 955, pp. Ji71-473). — Three sugar beet varieties gave higher yields on 

 plats that had received manganese at the rate of 150 kg. per hectare (133.5 lbs. 

 per acre) than they did on the check plats. Two other varieties gave higher 

 yields on the check plats. Analyses showed similarly variable results as to 

 density, purity quotient, and the sugar and dry matter percentages. 



Report on sugar experiments, 1910—11 (Bui. Dept. Agr. Jamaica, n. ser., 

 2 (1912), No. 5, pp. 1-27). — This is a report of variety and fertilizer tests with 

 sugar cane conducted on a number of estates in Jamaica. Tables state the 

 results of mechanical and chemical analyses of soils of different estates and 

 the cane yields obtained after various fertilizer applications. 



Timothy production on irrigated land in the Northwestern States, M. W. 

 Evans (JJ. 8. Dept. Agr., Fanners' Bui. 502, pp. 32). — This publication discusses 

 the growing of timothy in mixture with alfalfa in place of clover, a practice at 

 present used in only a few of the more important timothy-producing centers, 

 though well adapted to conditions on most of the irrigated land where timothy 

 is produced, and describes the methods of seeding, irrigating, cultivating, fer- 

 tilizing, harvesting, and marketing the crop, together with the treatment and 

 management of established timothy meadows and the crop rotations followed 

 in the region. 



[Canada weeds and weed seed] (Canada Dept. Agr., Seed Branch. Bui. S-6. 

 1911, pp. 70, flgs. 177). — The author divides this bulletin into 3 parts: (1) The 

 Seed Control Act, 1911, and Regulatons Made by the Governor in Council (pp. 

 3-10) ; (2) Seed Samples for Purity and Germination Tests (pp. 11-21) ; and 

 (3) Weeds and Weed Seeds (pp. 22-67). The third part gives descriptions and 

 illustrations of numerous weeds and weed seeds and brief notes on them. 



The eradication of wild onion, J. A. Voelckeb (Jour. Roy. Agr. Soc. England, 

 12 (1911), pp. 40-'f-j!f09). — Land on which wild onions had grown did not produce 

 a single onion strong enough to set seed during 2 years after it had been treated 

 to a mixture of 14 lbs. orchard grass, 7 lbs. tall fescue, 7 lbs. tall oat grass, 1 

 lb. rough-stalked meadow grass, 3 lbs. chicory, 8 lbs. burnet, 1 lb. yarrow, 3 lbs. 

 kidney vetch, 1 lb. alsike clover, 2 lbs. late-flowering red clover, and 2 lbs. of 

 white clover, or 49 lbs per acre in all. 



Among other methods of eradication tested in pot and plat experiments were 

 applications of lime, gas lime, carbolic acid, sulphocyanid of ammonium, sul- 

 phuric acid, arsenic, sulphate of copper, common salt, sulphate of magnesia, 



