1918] FIELD CHOPS. 137 



of only 2.22 lbs. A total loss of 29.9 lbs. was noted at the end of the experiment, 

 Mar. 13, 1916. 



It is concluded that sweet potatoes can be sufficiently cured in from 10 to 

 14 days and that cured potatoes stored in a dry room are far superior to 

 potatoes stored in banks in quality, condition, and freedom from decay, and that 

 they are to be preferred for bedding purposes. 



Plans and specifications are submitted for a storage house 20 by 20 ft, 

 with a 1,250-bu. capacity. 



Field experiments with tobacco, O. de Vkies {Proefstat. Vorstenland. Tabak 

 [Dutch East Indies], Medcd. 19 {1915), pp. U, pl- !)■ — This is a general outline 

 of (1) the methods employed, and (2) the investigations in progress in field 

 experiments with tobacco in the Dutch East Indies. 



Expectations from the Fi g'enerations of tobacco, A. d'Angeemond {Proef- 

 stat. Vorstenland. Tabak [Dutch East Indies], Meded. 23 {1916), pp. 45-65). — 

 This is a general discussion of the expectations in the F^ and Fa generations of 

 tobacco hybrids, based on Mendelian dominance and segregation of characters. 



A new seeding' device, .J. T. Baumgakten {Proefstat. Vorstenland. Tabak 

 [Dutch East Indies], Medcd. 23 {1916), pp. 91-93, pi. 1).—A device for seeding 

 tobacco seed beds is briefly described and illustrated. 



Fertilizing the seed beds, O. de Vries {Proefstat. Vorstenland. Tabak [Dutch 

 East Indies], Meded. 4 {1913). pp. 27, pis. 2).— Fertilizer experiments at eight 

 centers to determine the best treatment for tobacco seed beds are reported. 



The results in all but two cases indicated that an application of 100 gm. of 

 ammonium sulphate, 100 gm. of acid phosphate, and 25 gm. of potassium sul- 

 phate per seed bed of 10 by 3 ft. gave the best results. On the poor, sandy soil 

 of one center an application of 100 gm. of ammonium sulphate. 200 gm. of 

 acid phosphate, and 50 gm. of potassium sulphate gave the best results, while 

 on the wet, sandy soil of another center 100 gm. of ammonium sulphate and 

 either 100 or 200 gm. of acid phosphate proved to be best. 



[Report of fertilizer experim^ents with tobacco, 1910—1916], O. de Vkies 

 and E. Sidenius {Proefstat. Vorstenland. Tabak [Dutch East Indies], Meded. 

 2 {1913), pp. S2; 9 {1914), PP- 42; 15 {1915), pp. 64, pi. 1; 18 {1915), pp. 31- 

 63; 20 {1915), pp. 33-67; 26 {1916), pp. 28).— Fertilizer experiments conducted 

 at numerous centers in the Dutch East Indies are reported for each year. 

 These tests were planned primarily to study the effect of chemical fertilizers 

 upon the relative chemical composition of the lower, middle, and upper leaves 

 of the tobacco plant, together with the effects on yield and quality. 



The highest yields have been obtained from the use of ammonium sulphate, 

 although the senior author does not recommend its use on good soil. The esti- 

 mated average increase of fertilized fields for 1910-1914 was 10 per cent. 



The experiments were considerably reduced in 1915-16, but gave practically 

 the same results as noted above. With applications of 6, 10, and 16 gm. of 

 ammonium sulphate per plant the increases were 17.6, 15.3, and 21.4 per cent, 

 respectively. 



Green manuring tests, O. de Vkies {Proefstat. Vorstenland. Tabak [Dutch 

 East Indies], Meded. 20 {1915), pp. 4-19, pi. i).— Tests during 1913 and 1914 

 with Canavalia ensiformis, Desmodium stipulaceutn, Mucuna, Phaseolus lunatus, 

 and P. radiatus as green manures for tobacco are reported and briefly dis- 

 cussed. Agronomic data are presented in tabular form for each crop and for 

 each year of the experiment. The first three crops named gave the best 

 average results, based on tobacco yields. 



Harvesting experiments with tobacco, 1913-13, O. de Vkies {Proefstat. 

 Vorstenland. Tabak [Dutch East Indies], Meded. 8 [1914], pp. 45). — The author 

 reports experiments with early and late harvesting, harvesting of individual 



