1910] FIELD CROPS. 135 



than the barley and produced slightly more straw and grain with a limited 

 amount of phosphorus. 



Effect of crops on each other (Bui. R. I. State Col., 18 (1918), No. If, pp. 40, 

 41). — In a continuation of work at the Rhode Island Experiment Station pre- 

 viously noted (E. S. R.. 3S, p. 337), a second crop of alsike clover following dif- 

 ferent crops was harvested in 1917 with results similar to those obtained in 1916. 

 In both years the best yields followed rye, redtop, and squashes. 



A heavy seeding of Medium Green soy beans planted with 30 lbs. of Eureka 

 corn produced less green material, although probably more protein, than when 

 the corn was planted alone. A mixture of 15 lbs. of corn and 22.5 lbs. of soy 

 beans produced 19.6 tons per acre of satisfactory silage containing about one- 

 fifth beans by weight. By planting 21 lbs. of corn on 0.7 acre and 13.5 lbs. of 

 beans on 0.3 acre, 21 tons of material were obtained having the same relative 

 proportion of corn and beans. 



Plant propagation (Btd. R. I. State Col., 13 (1918), No. 4. p. 41).— In tests 

 at the Rhode Island Experiment Station, 2 oz. uncut seed tubers of Irish 

 Cobbler and Green Mountain potatoes were compared with 1.25 oz. seed pieces 

 from different sized potatoes cut into two, three, and four parts. The number 

 of eyes and stalks and the yields decreased in the order named. The uncut seed 

 produced about 300 bu. of marketable tubers and the potatoes cut into three or 

 four pieces about 250 bu. Sprouted uncut seed of Green Mountain produced 304 

 bu. of marketable tubers, as compared with 242 bu. from unsprouted seed. 



White Cap corn has failed to show any marked difference whether the seed 

 was selected from areas where the backward tassels were removed, from the 

 progeny of ears shown to be large producers by the ear-to-row method, or from 

 corn grown in the usual way and selected by its appearance. 



Steam sterilization of seed beds for tobacco and other crops, E. G. Bein- 

 haet (U. S. Dept. Agr., Farmers' Bui. 996 (1918), pp. 15, figs. 4). — This publica- 

 tion contains a description of the apparatus and methods employed in steam 

 sterilizing tobacco seed beds as outlined elsewhere by Scherffino et al. (E. S. R., 

 20, p. 834) and Gilbert (E. S. R., 22, p. 49). The application of the method to 

 the production of truck crops in the greenhouse, cold frame, or field, as suggested 

 by W. A. Orton, is indicated. 



The relative yields of oats and two-rowed barley in experiments in middle 

 Sweden, H. Tedin (Sveriges Utsadesfor. Tidskr., 21 (1911), No. 6, pp. 219-291).— 

 Comparative tests of 4 varieties of oats, Seger, Guldregn, Klock II, and Fyris. 

 and 2 varieties of two-rowed barley, Primus and Gullkorn, were in progress 

 from 1905 to 1917, inclusive. The average annual yield of grain of the 4 

 varieties of oats was 2,501 kg. per hectare (2,226 lbs. per acre) and of the 2 

 varieties of barley, 2,473 kg. With the production calculated on the basis of 

 nulled grain the oats gave an average annual yield of 1,877 kg. and the barley 

 of 2,226 kg. of grain per hectare. This yield represented 2,077 and 2,471 food 

 units per hectare, respectively. In 10 of the 13 years the barley surpassed the 

 oats in the production of hulled grain and food units. The varieties of oats 

 in general produced the larger yields of straw. 



Report on a comparative test with commercial fertilizers, barnyard 

 manure, and sewage, 1910—1916, P. Bolin (K. Landtbr. Akad. Handl. och 

 Tidskr., 56 (1911), No. 1-8, pp. 595-606). — In a number of experiments annually 

 conducted with oats, the applications consisted of 40,000 kg. of manure, of 

 20,000 kg. of manure with 200 kg. of superphosphate, and of 100 kg. of nitrate 

 of soda, 300 kg. of superphosphate, and 200 kg. of potash salt per hectare, with 

 the exception that in 1916 only 200 kg. of superphosphate and 150 kg. of potash 

 salt were used. These tests were made on bog and sphagnum moss soils. 



