1920] FIELD CROPS. 35 



from January 26 to May 25. on the effect of reduced oxygen on the loss of 

 weight of potatoes, tubers at a mean temperature of 9.39° C. (49° F.) stored in 

 air lost 8.96 and 17.24 per cent of their weight, and in reduced oxygen 1.35 and 

 2.79 per cent in 90 and 120 days, respectively. 



Prickly pear as stock feed, D. Griffiths {U. S. Dept. Agr.. Farmers' But. 

 1012 (1920). pp. 3-24, flO>^- S). — This discusses the importance, forms, distribu- 

 tion, and feeding value of the pricl<ly pear, together with the soil, moisture, 

 and temperature requirements of the plant, and gives directions for its propaga- 

 tion, cultivation, and harvesting. Methods of feeding and shipping prickly 

 pears are noted, and the stability of the spineless character is briefly considered. 



F"arni practice in growing sugar beets in the Billings region of Montana, 

 S. B. NucKOLS and E. L. Currier (Motitami ma Bui. 129 {1919), pp. 37, figs. 

 7). — This bulletin is identical with Bulletin 735 of the U. S. Department of 

 Agriculture (E. S. R., 40. p. 139). 



Growing sunflowers in Montana, A. Atkinson and J. B. Nelson {Montana 

 Sta. Btd. 131 {1919), pp. 3-11). — A brief discussion of the characteristics and 

 liistory of the cultivated sunflower is presented, and the results of tests on 

 yields and methods of growing sunflowers are given. 



In preliminary tests on the yields of the crop 36.8 tons of green silage mate- 

 rial per acre was secured in 1915, and 31.07 tons in 1916. Dry land tests 

 conducted in 1918 in 8 counties gave an average yield of 10.3 tons of silage 

 per acre. Planting tests showed the largest returns from drilling in rows 

 30 to 36 in. apart. At the station the highest average yield for 1917-18, 41.1 

 Ions of green forage per acre, was secured from rows 36 in. apart, while at 

 the Huntley substation in 1918 the highest yield, 37.6 tons of silage per acre, 

 was obtained from rows 20 in. apart. For planting, the use of the ordinary 

 grain drill, set for rows 30 to 36 in. apart and adjusted to drop seeds 4 to 5 

 in. apart in the row is recommended. In 1918 the earliest planting, made at 

 Bozeman April 29, gave the largest yields. The seed matured in only one of 

 the 4 years the crop was tested at the station. 



[Regulations regarding the culture of tobacco in Spain] (Reglamento 

 Ensayos del Cultivo del Tabaco en Espand. Madrid: Set: Pnb. Agr. Min. 

 Fomento, 1919, pp. 24)- — These regulations pertain to licenses, methods of cul- 

 ture, and official inspection as prescribed and approved by the Government for 

 the control of tobacco culture. An outline of the commissions and other ad- 

 ministrative agencies charged with the enforcement of the regulations is 

 also presented. 



Results of seed tests for 1919, F. W. Taylor {Neiv Hampshire Sta. Bui. 

 193 {1919), pp. 19).— The results for the year ended July 1, 1919, of analyzing 

 388 samples of seeds and testing their germination are given in tables. The 

 work was conducted in accordance with the provision of the State pure seed 

 law. 



The forty-eighth annual report of the State seed control, K. Dorph- 

 Petersen {Tidsskr. Planteavl, 26 {1919), No. 4, pp. 625-682) .—This report dis- 

 cusses in general the activities pursued under the State seed control laws, 

 and pre.sents in detail the results of the seed inspection for the year ended 

 June 30, 1919. 



During the period covered 24,378 seed samples were tested, an increase of 

 5,136 samples over the preceding year. The results of germination and purity 

 tests are given in tables and the frequency of occurrence of the principal 

 weed seeds in the samples is noted. The relation of the results to the guar- 

 anties on the part of the seed dealers is pointed out. A financial statement 

 for the year ended March 31, 1919, is also given. 



