250 SOIL SCIENCE [Bot. Absts., Vol. IV, 



climatic conditions on the utilization of artificial fertilizers are discussed. It was found that 

 the climatic conditions having a stimulating effect on the size of barley and oat crops, likewise 

 favored the utilization of the artificial fertilizers. Cold dry summers seemed to favor barley 

 grain and cold wet summers favored oats. In the case of mangolds and sugar beets (where 

 stable manure was used in addition to the artificial fertilizers) it was found that the climatic 

 conditions favorable to the size of the crop were usually unfavorable to the utilization of the 

 artificial fertilizers. Hot summers being favorable to the root crops, the heat likewise favored 

 the decomposition of the stable manure, hence there was less need for the nourishment con- 

 tained in the artificial fertilizers. Artificial fertilizers are more economically applied to the 

 root crops during cold, wet summers rather than during warm, dry summers. — When commer- 

 cial fertilizers were used separately, it w r as found that potassium gave the best average results 

 in warm, dry summers and phosphates in cold, wet summers. — The results were studied in 

 reference to the relation between the productive capacity of the soil and the size of the excess 

 crop when using artificial fertilizers. — Albert A. Hansen. 



1665. Jones, C. Bryner. The breaking up of permanent grass in 1918. Jour. Roy. Agric. 

 Soc. England 79: 24-44. 1918. — A general discussion of the crop results and soil treatments 

 of the permanent grass land of England which were planted in cultivated crops during the war. 

 The success of the crops on the heavier types of soil is a question of tilth, which is influenced 

 largely by the time of plowing. The applying of lime and suitable fertilizers, principally 

 phosphates, contributed materially to the success of the crop. — J. J. Skinner. 



1666. Kristexsex, R. K. Konservering af Ajle. [Preservation of liquid manure.] Tids- 

 skr. Landbrug. Planteavl 26: 485-490. 1919. — Experiments in the laboratory of the State 

 Experiment Station at Askov on the preservation of liquid manure attempted by the addi- 

 tion of sulphuric acid and superphosphate. An analysis of the liquid manure showed 0.478 

 per cent nitrogen and 0.418 per cent nitrogen in ammonia. The preservatives were added 

 and the manure placed in a water bath and vaporized. It was found that two-thirds of the 

 acid is bound by ammonia, and one-third by other bases. Absolutely no effect on the loss of 

 ammonia was observed by the addition of small amounts of acid. In order to bind all the 

 ammonia contained in 5 cm. of manure, 1.3 grams of superphosphate, containing 18 per cent 

 P2O5, was necessary. — Albert A. Hansen. 



1667. Mosseri, Victor M. Note sur les depots nilotiques des Gazayer et Saouahel 

 d'Egypte. [Note on the deposits of the Nile of the "Gazayer" and "Saouahel."] Bull. Union 

 des Agric. Egypte 17: 49-78. 1919.— See Bot. Absts. 4, Entry 109. 



1668. Ramsay, J. T. Manuring for profit. Results of experiments in potato cultivation. 

 Jour. Dept. Agric. Victoria 17: 471-175. Fig. 2. 1919. — Experiments with fertilizers on 

 potatoes growing on a dark sandy soil gave best results with 600 pounds per acre of bone 

 and superphosphate and 100 pounds of ammonium sulphate. — J. J. Skinner. 



1669. Rossem, C. vax. Bemestingsproeven in den proeftuin. Verslag over net jaar 1918, 

 tevens samenvatting van de resultaten met die der voorafgaande jaren. (Fertilizer experiments 

 and report for 1918 together with a summary of the results of previous years.) Mededeel. Algem. 

 Proefsta. Landb. Dept. Landb., Nijverheid en Handel, [Buitzenorg] 2 : 1—40. 1919. — Extensive 

 comparisons are made of various artificial manures with regard to their effect on the produc- 

 tion of rice. In six tests calcium nitrate had about the same effect as ammonium sulphate 

 while both were more favorable than Chili saltpeter. Sulphuric acid appeared to have no 

 influence on rice production. Calcium carbonate increased the yield. Chili saltpeter and 

 ammonium sulphate were compared in production of cassave and the results showed that the 

 former used singly or in combination with superphosphate gave the highest yields. — R. D. 

 Rands. 



1670. Russell, G. A. The effect of fertilizers on the composition of hops. Jour. Indust. 

 Eng. Chem. 11: 218-224. 1919.— See Bot. Absts. 4, Entry 122. 



