256 SOIL SCIENCE [Bot. Absts. 



air-dry condition has a profound effect in reversing colloidal properties. The recovery from 

 such a reversal is by no means immediate upon wetting but is comparatively slow. The in- 

 fluence of drying upon colloidal conditions seems to the author to be more or less indirect, 

 the direct effects being produced by later chemical and biological actions. — H . 0. Buckman. 



1764. Lewis, C. I. Correlation of orchard practices. Better Fruit 13 9 : 17-22. Tab. 1-8. 

 March, 1919. Nitrogen as sodium nitrate, applied at a rate of 3-5 pounds per tree proved 

 to be best fertilizer for apples. Early spring application gave best results. [See Bot. 

 Absts. 3, Entry 2341.]— J". J. Skinner. 



1765. Lipman, C. B., and W. F. Gericke. The inhibition by stable manure of the inju- 

 rious effects of alkali salts in soils. Soil Sci. 7: 105-120. 1919. — By pot experiments in the 

 greenhouse, barnyard manure was found to reduce or eliminate the toxic action of sodium 

 chloride, sodium sulfate or sodium carbonate on barley plants. Four successive crops were 

 grown. The salts were tested singly at the rate of 0.3 per cent each for sodium chloride and 

 sodium carbonate, and 0.6 per cent for sodium sulfate, based on the dry weight of the soil. 

 Previous to the second planting additional quantities of the salts were added at the same rate. 

 It should be feasible and profitable to offset the inhibiting effects of the salts in some of the 

 alkali land of the west by use of barnyard manure or other form of organic matter. — Willia?n 

 J. Robbins. 



1766. Main, F. [Rev. of : Fauchere, A. Guide pratique d'agriculture tropicale. 159 p. 

 Paris. Augustinn Challmel, 1918.] Jour. Agric. Tropic. 19 (Bull. Bibliog.) : 127. 1919.— 

 See Bot. Absts. 3, Entry 1379. 



1767. Metge, G. [Rev. of: Clausen. Die Bodenausnutzung durch die Kartoffel bei 

 kleinen und grossen Saatknollen und bei enger und weiter Pflanzenzweite. (Utilization of 

 the soil by the use of large and small seed potato tubers and by close and wide spacing.) Illustr. 

 Landw. Zeitg. 37: 108-109. 1917.] Biedermann's Zentralbl. Agrikulturchem. 47: 285. 1918. 

 —See Bot. Absts. 3, Entry 1385. 



1768. Metge, G. [Rev. of Lemmerman, O., and H. Wiessmann. Uber die Wirkung 

 einer humosen Braunkohle als Konservierungsmittel fur Jauche. (On the action of humus 

 brown coal as a preservative for liquid manure.) Mitteil. Deutsch. Landw. Ges. 32: 741-743. 

 1917.] Biedermann's Zentralbl. Agrikulturchem. 47: 307-311. 1918. — Tests on the humus 

 brown coal showed that it fixed 5.122 per cent of NH 3 while peat fixed only 1.9S1 per cent. 

 Sixty per cent additions of the coal was found to conserve 50 to 60 per cent of strongly fer- 

 menting manure. In the (stable runnings) (' gauche') treated with brown coal the author 

 found 4.41 grams of total nitrogen (in 500 cc. of the liquid) while in material not so treated 

 he found only 0.375 grams of total nitrogen. For a cubic meter of liquid manure 2000 lbs. of 

 brown coal is required. Experiments with beets using conserved liquid manure as a source 

 of nitrogen compared favorable with similar experiments in which ammonium sulphate was 

 used. — F. M. Schertz. 



1769. Metge, G. [Rev. of: Wagner, P. Wie wirkt die Saatgutbeschaffenheit auf den 

 Kartoffelertrag unter dem Einfluss verschiedener Pflanzweite, Giingung and Jahreswitterung. 

 (Influence of the seed stock on the yield of potatoes under the influence of different distance of 

 planting, manuring and weather.) Deutsch. Landw. Presse 45: 169, 175-176, 1S3. 191 S.] 

 Biedermann's Zentralbl. Agrikulturchem. 47: 325-333. 191S— See Bot. Absts. 3, Entry 1386. 



1770. Miller, H. G. Relation of sulphates to plant growth and composition. Jour. 

 Agric. Res. 17: 87-102. PI. 9-12. 1919.- — Sodium sulphate, calcium sulphate and sulphur 

 were added separately to beaver-dam, loam and clay-adobe soils. Red clover, oats and rape 

 were grown in small pots of these treated soils in a greenhouse. The sulphur, together with 

 calcium carbonate, was added to the soils when planting the seed. The sulphates were dis- 

 tributed by daily applications in solution. Nitrogen was supplied from a solution of sodium 



