1920] FIELD CROPS. 231 



[Tlie effect of rotations on yield and profit from bog soils], A. Gi;an- 

 sri;oM (Srcii.sLit Mos.sLitll iirfor. Tidnkr., :t>, (V.r.>()). No. 2, pp. 'jQ-l.i. /i,js. :?).— 

 The results of experiments conducted for eislit years with four different rota- 

 tions on bog soil are reported in detail and discussed. All rotations received 

 annually 3,000 kg. of barnyard manure per hectare (2,G70 lbs. per acre), in 

 addition to commercial fertilizer applications varying somewhat in quantity 

 and proportions according to the crops grown. 



The most profitable rotation consisted of oats for green forage the first year, 

 grass the second, tliird, and fourth years, oats for grain tlie fifth year, and 

 field beets the sixtli. This rotation gave a net profit of 335 l<roner per hectare 

 (.$3G.34 per acre) with a cost of production of 11.7 ore (3 cts.) per feed unit 

 (the e(|uivalent in feeding value of 1 kg. of n)ixed concentrates). 



ItesuUs of local field experiments on the comparative value of important 

 varieties of different crops, P. Bolin (A". Landtbr. Alcad. Ilandl. och Tidskr., 

 oS {1019), No. 5, pp. 253-281, figs. 7). — The results of cooperative experiments 

 conducted for eight years in different parts of Sweden and on various types 

 of .soil are reported, and the precipitation records for May to August, inclusive, 

 tif each year for the different localities are given in grapliic form. 



Svalof Stjiirn rye gave an average yield of grain and straw about 5 per 

 cent greater in each case than that secured from Petkus rye. The increases 

 in yields in favor of Stjiirn rye were greater on clay soil than on sandy soil. 

 Svalof Improved Vasa rye gave an average yield of grain approximately 18 

 per cent higher, and an average yield of straw about 6 per cent lower, than 

 was obtained from ordinary Vasa rye. In winter resistance the two varieties 

 stood very close together. 



* The average yield of grain of Svalof Tule wheat 2 was only 3 per cent 

 better than that of Svalof Tule wheat 1, and this is not considered as out- 

 weighing its somewhat undesirable character of sprouting too readil.y. Weibull 

 Iduna wheat compared with these two varieties in Svealand exhibited about 

 the same yielding capacity, but in Varmland the Tule varieties gave the better 

 yields, which is regarded as indicating that Iduna wheat ranl?s lower in 

 hardiness. 



Seger and Ouldregn oats in southern and middle Sweden gave about efpial 

 average yields of grain, but It was found that on mineral soils Seger outyielded 

 Guldregn by about 2 per cent, while on soils rich in organic matter the yields 

 were in favor of (iiildregn by about 4 per cent. Guldregn oats also yielded 

 a little better than Seger under conditions of ample rainfall. Kron oats as 

 compared with Seger in southern and middle' Sweden gave about 5 per cent 

 more grain and 4 per cent more straw than was harvested from Seger oats, 

 but no data as to the comparative behavior of the varieties in other parts of 

 the country or on different types of soil were obtained. A test of oats showed 

 about 8 per cent greater yields of grain and 9 per cent of straw in favor of 

 SvalJif Klock 3 as compared with Svalof Klock 2, but the former produced only 

 a very little more grain than was secured from Stormogul and yielded 10 per 

 cent less straw. On sandy .soils the difference in yields between Svalof Klock 

 3 and Svaliif Klock 2 was somewhat less than on other soil types. 



Weibull Monopol and Svalof Solo peas produced about the same average 

 yield of ripe peas, but Weibull Monopol gave about 6 per cent the more green 

 substance. 



Results of cooperative experiments, L. Akoxsson (Malino. Liins HtLfhuU. 

 SiiUak. Krrtls.'ikr., ]<)1D, No. If, pp. ///o-.'/oS).— Sugar beets, field beets, and 

 potatoes grown in IDIS-IO on sandy and clay soil in general gave the host 

 returns when treated with ai)plications of complete fertilizer mixtures. In a 



I 



