706 EXPERIMENT STATION R.I<:CORD. 



entirely useless for cereals, unless accompanied by lieavy applications 

 of nitrogenous fertilizers. This limit of profitable application of pbos- 

 pbatic manures will be exceeded or fallen short of according to the avail- 

 ability of the phosphoric acid of the soil, the season, etc. 



The season was such and the number of exi)eriments with potash so 

 shiall that no definite conclusions as to the limit of profitable potash 

 fertilizing can be drawn, but it is shown with considerable certainty 

 that the limit is considerably higher tlian with phosphatic manures. 

 It appears also that for cereals soils must contain more lime than pot- 

 ash in order that potash fertilizing may be i)rofltable. 



Conservation of nioisttire in the soil, S. B. Guken (Minnesota Sta. Itpt. 1S93, 

 pp. 33.2-238). — Kepriutod from Bulletin 32 of the station (E. S. R., 6, p. 21). 



Nitrification, J. R. Haiiris {.Tonr. Ellsha Mitchell Sci. Soc., 11 {1S04), No. 1, 

 pp. 10-35). — A resunn'^. 



The conservation of nitrates in the soil (Joitr. Agr. Prat., r>9 {1S95), No. 4, 

 pp. 144, 145). — A brief sniinuai-y of Deboniiu's results. 



The available plant food in soils (Jour. Bath and West of England Soc., 4 (1S93-94), 

 ser. 4, p)p. 212-315). — A brief review of an article by B. Dyer on this subject.' 



The composition of native and cultivated soils and the effects of continuous 

 cultivation upon their fertility, H. Sxydkr ( Minnesota Sta. I!pt. IS93, pp. 163-191). — 

 A reprint of Bulletin 30 of the station (E. S. R., 5, p. 857), with the addition of 

 brief notes on the collecting and forwarding of soil samples. 



The management of clay farms, W. F. Buown (Cult, and Country (lent., 70 (1SD5), 

 No. 2195, pp. 143, 144). — Notes on cultivation on clay land in Ohio, with advice as 

 to its proper treatment. 



FERTILIZERS. 



Analyses and valuation of complete fertilizers, ground bone, 

 and miscellaneous samples, E. 1>. Vuukiiees, L. A. Vookiiees, and 

 J. P. Street (Wew Jersey Stas. Bui. 104, pp. 46). — This is the second 

 of the two regular annual bulletins on fertilizers issued by the station. 

 The main object of the first (Bui. 102; E. S. II., G, ]). 31)0) was "to show 

 the sources and composition of the materials containing the best forms 

 of nitrogen, phosphoric acid, and potash; the cost per pound of the 

 ingredients; and the advantages of making home mixtures." The 

 present bulletin gives analyses and valuation of 224 samples of mixed 

 fertilizers, 2!) samples of bone, 9 samples of wood ashes, and 17 s.amples 

 of miscellaneous products, the main object being "to show whether the 

 actual composition of the various products corresponds with their 

 guaranty as required by law." 



As a rule the fertilizers examined contained as much total plant food 

 as was guaranteed, but in many cases "it was not distributed in the 

 proportions stated in the guaranties, which indicate either a lack of 

 skill or of carefulness in their preparation. In two cases only the 

 consumer received less of all of the [»lant-food constituents than was 

 guaranteed." 



1 Jour. Chcm. Soc. Loudon, 1894, Mar,, p. 115 (E. S. R., 5, p. 1013), 



