306 SOIL SCIENCE [Bot. Absts., Vol. X, 



1980. Blanck, E., und F. Preiss. tJber die Stickstoffwirkung der sich bei der Kon- 

 servierung der Jauche mit Formalin bildenden Stoffe auf die Pflanzenproduction. [Influence 

 of the nitrogen, in liquid manure conserved by means of formalin, upon plant production.] Jour. 

 Landw. 69: 33—48. 1921. — The hexamethylenetetramine present in liquid manure conserved 

 with formalin acts favorably upon plant production. Aldehyde-urea, a condensation product, 

 did not give favorable results. For best results it is concluded that formalin should not be 

 added to liquid manure until all of the urea has been converted into ammonia. — F. M. Schertz. 



1981. Christian, H. Basil. Experiments in soil treatment in the Enterprise District, 

 southern Rhodesia. Rhodesia Agric. Jour. 18: 405-410. 2 fig. 1921. 



1982. CoPPA, Amalia. Ricerche sui protozoi dei terreni e delle acque ticinesi. [Re- 

 searches upon the protozoa of the soils and waters of the Ticino.] Staz. Sper. Agrarie Ital. 54: 

 181-213. Fig. 1-5. 1921. — A qualitative-quantitative count of the protozoa found in culti- 

 vated soils, irrigated rice fields, irrigated pasture lands, and irrigation waters is presented. 

 The influence of various fertilizers upon these counts was studied and found to be negligible. 

 The geological origin of the soils appears to have a decided influence upon the count. Silice- 

 ous soils have a greater protozoan content than calcareous soils. A characteristic facies was 

 found only in rice fields, since water was found to be the factor which influenced to the greatest 

 degree the unicellular life in a soil. — A. Bonazzi. 



1983. F[yson], p. F. [Rev. of: Beckley, V. A. The preparation and fractionation of 

 humic acid; and the formation of humus. Jour. Agric. Sci. 11: 66, 69. 1921.] Jour. Indian 

 Bot. 2:212. 1921. 



1984. F[yson], P. F. [Rev. of : Harrison, W. H. Carbon dioxide in relation to rice soils. 

 Mem. Depart. Agric. India Chem. Ser. 5: 181-194 1920.] Jour. Indian Bot. 2: 212. 1921. 



1985. Geilmann, W., und A. van Hautbn. Die Andening der loslichen Bodensalze und 

 der Schlammkurve gediingter Parzellen im Laufe der Entwicklung von Riiben. [Variation of 

 the soluble salts and the elutriation curve of fertilized plots during the course of the develop- 

 ment of beets.] Jour. Landw. 69: 105-130. 1921.— Plot experiments in 1919 and 1920 showed 

 that the amount of water-soluble salts in the soil was greatly infuenced by fertilizers. Soluble 

 salts varied during the course of the growing season and were found to be somewhat corre- 

 lated with the moisture content of the soil. Elutriation curves were found to be greatly 

 influenced by fertilizers. — F. M. Schertz. 



1986. Mezger, C. tJber unterirdische Dampfstromungen und ihre Bedeutung fiir den 

 Wasserhaushalt des Bodens. [Subterranean water-vapor currents and their significance in 

 the water economy of soils.] Jour. Landw. 69: 49-64. 1921. — This study, which is largely a 

 review of the literature, includes a review of conditions which make for an increase and a 

 decrease in the ground water. — F. M. Schertz. 



1987. Seelhorst, C. von., W. Geilmann, und H. Hubenthal. Uber den Einfiuss von 

 Diingung und Pflanzenwuchs auf die Fallkurve von Wasser-Bodengemischen. [Influence of 

 fertilizing and plant growth on the precipitation curve of water-soil mixtures.] Jour. Landw. 

 69 : 5-32. 1921 . — Wiegner 's method was used in the analysis by elutriation and the Kohlrausch- 

 Holburn method for estimating conductivity. From various experimental plots the authors 

 collected data on the solubility of the salts in the soil as affected by fertilizing and by the 

 plants grown. — F. M. Schertz. 



1988. White, J. W., and F. J. Holben. Soil fertility experiments on De Kalb, Volusia 

 and Westmoreland soils. Pennsylvania Agric. Exp. Sta. Bull. 166. 2S p., 1 jig. 1921. — The 

 experiments here reported are located in Center County on De Kalb soil; in Bradford County 

 on Volusia soil; and in Washington County on Westmoreland soil, and comprise 152 plots on 

 18.4 acres. — On De Kalb soil the average yields for 5 years upon 5 unfertilized plots was for clo- 

 ver hay practically 0; corn, 2.8 bushels; oats, 7.8 bushels; wheat, 0.12 bushels. The maximum 

 application of commercial fertilizers gave an average yield of 1800 pounds clover hay, 39.3 



