No. 2, September 1920] SOIL SCIENCE 295 



the same time considerably increased the lime requirement. In plot experiments, with the 

 same soil, green rye increased the lime requirement twice as much as an equal weigb.1 of green 

 clover. — W. ./. Rabbins. 



2261. Howard, L. P. The relation of certain acidic to basic constituents of the soil affected 

 by ammonium sulfate and nitrate of soda. Soil Sci. 8 : 313-321 . 1919. — Studies made on limed 

 and unlimed plots which have been treated with ammonium sulfate or sodium nitrate showthat 

 the hydrogen ion concentration in the unlimed ammonium sulfate treated plot is very similar 

 (about P„ 4) to that produced by even quite large additions of aluminium salts to buffer solu- 

 tions. Extractions with potassium chloride solution and 0.2 normal hydrochloric acid solu- 

 tion remove relatively large amounts of aluminum and iron from the soil of the unlimed 

 ammonium sulfate treated plot. — W. J . Bobbins. 



2262. Lipman, J. G., and A. W. Bi.air. The lime factor in permanant soil improvement. 

 1. Rotation without legumes. Soil Sci. 9: 83-90. 1920. 2. Rotation with legumes. Ibid. 9: 

 91-114. 1920. A 5-year rotation of corn, oats, wheat and 2 years of timothy was grown on 

 plots which were unlimed or which received 1 ton of lime as carbonate per acre for the first 

 5 years and 2 tons of lime per acre for the second 5 years. The total yields of dry matter and 

 of nitrogen for the 10-year period for the limed and unlimed plots were essentially the same. 

 Analyses of the soil at the beginning of the experiment and after each 5-year period showed 

 a loss of nitrogen from both limed and unlimed plots but a greater loss from the limed plots. 

 Four 5-year rotations each containing a leguminous crop were carried out on plots which were 

 unlimed or which received 1000, 2000 or 4000 pounds per acre of calcium or magnesium lime- 

 stone. During a 10-year period, the limed plots yielded distinctly larger crops and more total 

 nitrogen than the unlimed. Analyses of the soil show in most cases an amount of nitrogen 

 in the limed plots equal to or greater than that in the unlimed. The magnesium limestone 

 was slightly superior to the calcium limestone. — W. J . Rabbins. 



2263. MacIntire, W. H. The liberation of native soil potassium induced by different 

 calcic and magnesic materials. Soil Sci. 8 : 337-395. PL 1 . 19 fig. 1919.— The results of five 

 years experiments show that practical or economical applications of burnt calcareous lime- 

 stone, burnt dolomitic limestone, ground calcareous limestone or ground dolomitic limestone 

 will not effect a direct chemical liberation of native 6oil potassium. — W. J. Robbins. 



2264. Stutzer, A. Beitrage zur Dungekalkfrage. [A contribution to the calcium fertilizer 

 problem.] Illustrierte Landw. Zeitg. 39: 333-334. 1919. 



2265. [Tansley, A. G.] Investigations on soil. [Rev. of: Hartwell, B. L., F. R. Pem- 

 ber and L. P. Howard. Lime requirement as determined by the plant and the chemist. 

 Soil Sci. 279-282. 1919.] Jour. Ecol. 7: 214. 1919. 



2266. Walker, Seth S. The effect of aeration and other factors on the lime requirement 

 of a muck soil. Soil Sci. 9: 77-81. 1920. — Air-drying a black muck soil increases the lime 

 requirements. The increase in lime requirements was less in a stirred moist portion than 

 in a water covered undisturbed portion. The lime requirement of stored moist samples 

 increased but that of stored dry samples decreased. Soil neutralized with calcium carbonate 

 and stored moist showed a greater increase in lime requirement than unneutralized soil. — 

 W. J. Robbing. 



FERTILIZATION 



2267. Beckwith, Charles C. The effect of certain nitrogenous and phosphatic fertilizers 

 on the yield of cranberries. Soil Sci. 8: 483-490. 1919.— See Bot. Absts. 5, Entry 1723. 



2268. Blair, A. W. Barium phosphate experiments. Amer. Fert, 52: 142-144. 1920.— 

 Experiment was made comparing barium phosphate and other phosphate materials. Beans 

 and corn were grown. Practically no increased crop production was secured from the use 

 of barium phosphate. — J. J. Skinner. 



BOTANICAL ABSTRACTS, TOL. V, NO. 2 



