220 EXPERIMENT STATION EECORD. 



tilizer values, and that the same holds true with calcium cyanamid and sulphate 

 of ammonia when applied in quantities containing similar amounts of nitrogen. 



Four series of exi>eriments in subsoiling were conducted on clayey or humus 

 soils, with vetches and oats, oats, and oats and barley. An increase in the 

 yields of grain was obtained at harvest time from the subsoiled plats over 

 those from the plats plowed in the ordinary way, ranging in the different 

 series from 120 to .310 kg. per hectare, and from a loss of 10 kg. to a gain of 

 710 kg. in straw. There was an increase in the value of the crops harvested 

 even in the first year, ranging from about 16 to 29 kroner per hectare (.$1.75 

 to $5..36 per acre). — f. w. woll. 



Fertilizer experiments with precipitated calcium phosphate, III, H. G. 

 SoDERBAUM (K. Laiultbr. Akaxl. HamU. och Tidskr., ^6 (1907), No. 1, pp. 

 39-46). — Precipitated calcium phosphate, prepared electrolytically according to 

 the method of W. Palmaer, showed a fertilizing value similar to that of super- 

 phosphate in experiments conducted by the author during 1901-1905. It also 

 resembles superphosphate in that liming has been found not to decrease its 

 fertilizing effect, as is the case with tricalcium phosphate. The pi'ecipitated 

 calcium phosphate contains 36 to 38 per cent of phosphoric acid, 95 per cent of 

 which is citrate-soluble. The method of manufacture is described in the paper, 

 with a brief account of pot experiments in which this fertilizer was compared 

 with Thomas slag and superphosphate for oats. — f. w. woll. 



Can the availability of bone-meal phosphoric acid be increased by appli- 

 cation of ammonium sulphate? O. Bottcher (Lamlw. Vers. Htat., 65 (1901), 

 No. .'/-J, pp. J,01-Jill; (lbs. ill .Jour. Chcni. Soc. [London'l, 92 (1907). No. .)3.'i. 11, 

 p. 295). — In pot experiments ammonium sulphate considerably increased the 

 availability of bone meal for oats growing in a humus sandy loam. This is 

 attributed to the physiological acidity of the salt, as explained by Prianisch- 

 nikov (E. S. R., 18, p. 539), for raw phosphate. Sodium nitrate had no such 

 effect. It is questioned whether the small amount of ammonium sulphate 

 ordinarily used in field experiments would give the results observed in the pot 

 experiments. 



Fermented bone meal was no more available than steamed bone meal. 



Investigations on the action of heavy applications of ammonium sul- 

 phate in presence of organic substances and calcium carbonate in the soil, 

 A. Stutzer (Jour. Landir., 55 (1907). No. 1. pp. 81-91). — Pot experiments with 

 buckwheat followed by mustard to determine whether the injurious effect of 

 adding organic matter (2 per cent of peat, 1 per cent of starch, and 1 per cent 

 of chopped straw) can be prevented by adding sufficient ammonium sulphate to 

 relieve the nitrogen hunger of the micro-organisms of the soil are reported, with 

 incidental observations on the effect of calcium carbonate (1 per cent) under 

 these conditions. In general the growth was poorer and the stands were less 

 healthy with ammoniiim sulphate than with sodium nitrate. The addition of 

 calcium carbonate increased the injurious effect of ammonium sulphate, both 

 in soils which had received no addition of organic matter and those to which 

 peat had been add>ed. The addition of starch and chopped straw also depressed 

 the yield. In case of the latter the injury was reduced by the addition of cal- 

 cium carbonate. The addition of lime had a beneficial effect upon the, following 

 crop of mustard. 



Comparative fertilizer trials with new nitrogenous fertilizers, S. Rhodin 

 (K. Landthr. AJcad. Handl. och Tidskr.. .'i6 (1907), No. 1. pp. 3-21).— The ex- 

 periments here described were conducted at the experiment station at the Royal 

 Swedish Agricultural Academy during the years 1903-1906. 



The results of the trials are summarized by the author as follows : Calcium 

 cyanamid applied directly before sowing time and harrowed in carefully and 



