1919] , FIELD CROPS. 533 



The use of sulphate of ammonia as a fertilizer for sugar cane, J. T. Cu.vw- 

 ley (Sugar [\<ir Yurkl. 80 (1918), Nos. 5, }>i>. 111-1X0. figs. S; 6, i>i>. 222-225, 

 figs. 2; 7, pp. 267, 268; 8, pp. 812-314).— The author presents a rather general 

 review of fertilizer practices, with particular reference to the use of sulphate 

 of ammonia, in the principal sugar-cane producing countries, Including Porto 

 Rico, British West indies, British Guiana, Cuba, Louisiana and other southern 

 States, Java, and Hawaii. 



It is concluded that nitrogen is the most important element in the fertiliza- 

 tion of sugar cane, and that wherever mixed fertilizers are used sulphate of am- 

 monia is the usual source of nitrogen, except where nitrogen from other sources 

 is more plentiful or cheaper. It was also ohserved that where nitrogenous 

 dressings were used sulphate of ammonia was preferred in practically all sugar- 

 growing sections. 



The sugar situation, C. L. Spencer (Jacksonville, Fin.: The Drew Press, 

 1918, pp. 89+VI, figs. 58). — This is a comprehensive discussion of the factors 

 contributing to the shortage of sugar, with suggestions as to remedial meas- 

 ures and with particular reference to the encouragement of cane sugar and sirup 

 production in southeastern United States. 



A study of Swedish sunflower seed in 1917, S. Khodin (Meddel. Central- 

 anst. Forsoksv. Jordbruksomr&det, No. 170 (1918), pp. 14; K. Lundthr. Mead. 

 If anal, och Tidskr., 57 (1918), No. 4, pp. 317-328).— This article discusses the 

 temperature and moisture requirements of sunflower culture and their relation 

 to the climatic conditions of various localities in Sweden, where sunflowers 

 were grown experimentally to test their value as a source of oil. Samples 

 of seed from 1G localities were studied as to their maturity, germination, weight, 

 fat content, and moisture content, and the results are reported in tabular form. 



It was found that a high moisture content of the seed tends to give low germ- 

 ination. These samples proved to be of a higher moisture content than that 

 reported for seed produced in Hungary. The fat content of the 16 samples, on 

 the basis of 10 per cent of moisture, ranged from 12.67 to 26.09 per cent. At- 

 tention is called to the fact that in Hungary a fat content of 20.6S per cent with 

 10 per cent of moisture is considered the minimum for profitable oil extrac- 

 tion, and that on the average in that country the seed with 10 per cent of 

 moisture contains about 27.82 per cent of oil. of the samples grown in these 

 experiments five were well above the Hungarian minimum. 



Stocks of leaf tobacco (Bur. of the Census [U, S.] Bui. 136 (1918), pp. //.}, 

 fig. 1). — Statistical data are presented and discussed showing the stocks of 

 leaf tobacco held semiannually from October 1, 1912, to October 1, 1916, and 

 quarterly since then, also statistics assembled for the different phases of the 

 industry "regarding the production, consumption, imports, and exports of to- 

 bacco, the prices obtained for the staple by the growers, the quantities of the 

 several products manufactured therefrom, and the revenue on tobacco collected 

 by the Government of the United States." 



Wheat growing in Saskatchewan, J. Brackex (Univ. Saskatchewan, Col. 

 A (jr. Field Husb. Bui. 1 [1917], pp. 106, pi. 1, figs. 65). — This publication presents 

 a comprehensive summary of experimental work with wheat conducted at the 

 University of Saskatchewan, including variety tests and observations on cul- 

 tural, rotation, and fertility practices. Considerable statistical and other 

 information concerning the production, botany, milling, grading, and marketing 

 of wheat is also given. 



[Cultural and fertilizer tests with wheat in Argentina], A. C. Tonxelier 

 (Min. Agr. Nac. [Buenos Aires], Dir. Gen. Ensenansa c Invest. Agr. [Pub.] Xo. 

 78 (1918), pp. 4$> fig*' 4)- — The author reports rather extensive cultural and 

 fertilizer tests with wheat conducted during the period 1911 to 1916, inclusive, 



