FEETILIZEES. 851 



On experiments with manure and artificial fertilizers, (). Ojikk ( Tidxakr. 



Kor.ske Lamlhr., 9 {190,.'), No. 6, pp. ^45-26S). 



On ttie manuring of the soil in Algiers and Tunis, G. Kyk {Bid. Dir. Agr. et 

 Com. [2Vh/.s], S{1903), No J6, })p. fl9-7S) . — A brief general discussion of the care, 

 management, and use on different t-ro{)s of farm manures. 



On the organization of local fertilizer experiments in European countries, 

 A. RiNDELL {Landbr. Sti/r. Meddel., 1902, No. 41, PP- 44)- — A report on the organiza- 

 tion of cooperative and other fertilizer experiments in the Bcandinavian countries, 

 England, and France. 



The supplying of the phosphoric acid requirements of plants, P. Wagner 

 {Jahrb. Bent, fjindir. dm'lJ., 17 {1902), pp. 2G-.30).—X general discussion of this 

 subject. 



Fertilizer experiments with phosphates, 1900-01, O. Reitmair {Zhchr. 

 Landw. Versuchsw. OeHtcrr., G {1903), No. 2, pp. 95-194, pf- !)■ — Previously noted 

 from another source (E. S. R., 14, p. 647). 



On the question of the influence of a physiologically acid salt in rendering 

 phosphorite soluble, I. SciiVlov {Zlmr. Opuiin. Agron. \_Jour. Expt. Landw.'], 3 

 {1902), No. 6, pp. 711-719, Jig. 1). — In continuation of previous experiments (E. S. R., 

 14, p. 343) , the author made pot experiments with oats to determine whether the 

 action of ammonium salts in rendering phosphorite soluble is due to changes (sepa- 

 ration of base and acid) occurring in the soil or after the salts are absorbed by the 

 l)lant. In one series of experiments the ammonium salt and the phosphorite were 

 intimately mixed in the soil, in another series double jjots were used in which the 

 ammonium salt and the phosphorite were kejit separate, though each was accessible 

 to the plant. The results quite clearly indicate that the changes which result in 

 increasing the assimilability of the phosphorite occur only when the ammonium salt 

 is intimately mixed with the phosphorite in the soil. 



Algiers phosphate against Thomas phosphate, A. Ystgaard {Norsk Land- 

 mamhhlad, 21 ( i;i02). No. 4<>, PP- o56, .557). 



Pot experiments with fertilizers, B. Schulze {.faJiresher. That. Agr. ('hem. Vers. 

 Stat., Prorin: Schlesien, 1901-2, j>p. 21-32) . — These included comparative tests during2 

 years of kainit, muriate of })otash and sulphate of potash on oats and barley, in which 

 the largest yield and utilization of potash by the crop was shown in case of the muri- 

 ate, sulphate being second as regards yield and third as regards utilization of potash 

 by the crop; studies of the action of the phosphoric acid of steamed bone with and 

 without the simultaneous application of lime, which showed the depressing effect of 

 the latter on the former in experiments with oats; similar experiments which indi- 

 cated that the nitrogen of steamed bone is somewhat more effective on oats than 

 that of ammonium sulphate; exjieriments which showed a low effectiveness for the 

 nitrogen of ground leather on white mustard as compared with ammonium sulphate; 

 experiments on oats and j^eas which showed that acetylene gas residue has no 

 injurious effect and produces fully as large yields as calcium carbonate; comparative 

 tests which showed that the water-soluble phosphoric acid of superphosi)hate is 

 more effective in increasing the yield of potatoes than the citrate-soluble acid of 

 Thomas slag; comparative trials on oats, in which ammonium sulphate applied one- 

 half before seeding and one-sixth in each of 3 top-dressings during the growing 

 season gave better results than nitrate of soda applied one-half before seeding and 

 one-third in each of 2 top-dressings afterwards; and a reference to experiments on 

 the replacement of potash by soda. 



Fertilizer experiments with kainit and 40 per cent potash salt, B. Schulze 

 {Jidiresher. That. Agr. Chent. ]'ers. Stat., J'roriiiz Sehlemn, 1901-2, pp. 6-20). — 

 Experiments on sugar beets, potatoes, barley, and grass lands are reported. During 

 the 3 years over which the experiments have extended the 2 potash salts gave about 

 equally good results on sugar beets, the kainit being somewhat more profitable in 



