1917] SOILS FERTILIZERS. 419 



a beech-maple forest soil and on the bordering cultivated fields of wheat and 

 oats are reported. 



It was found that " the evaporation rate at the surface of cultivated fields 

 is somewhat parallel to that of the climax beech-maple forest and shows cor- 

 responding variations due to changes in weather conditions. After crops are 

 harvested the evaporation rate is greatly increased, due to the increased ex- 

 posure. In the beech-maple forest the soil moisture is much higher in the 

 stratum, due largely to the gi*eat amount of humus. In this association the 

 wilting coefficient was reached only once during the season. In the wheat field 

 the upper stratum shows a marked response in soil moisture due to periodic 

 rainfall. In this association the soil moisture falls decidedly below the wilting 

 coeflicient after the wheat is harvested. The upper stratum of the oat field 

 also shows considerable variations which correspond more or less to those in the 

 wheat field." 



Three references to literature bearing on the subject are appended. 



Tobacco soils and the tobaccos grown thereon, N. H. Cohen (Proefstat. 

 Yorstenlaml. Tabalc [Dutch East Indies], 3Icded. 11 (1914), pp. 18, pis. 3).— 

 Analyses of 20 samples of tobacco soils from eight different localities in Java 

 are reported and compared with analyses of the tobacco grown on these soils. 



It was found that the solubility in citric acid of the phosphoric acid of the 

 soils decreased as the soils were heavier and more weathered. The content of 

 available lime of the different soils increased with the content of finest particles 

 in the soil. The quotient of the content of lime soluble in 25 per cent hydro- 

 chloric acid and content of available lime decreased as the content of finest 

 particles increased and approached unity. No relation was found between 

 the content of potash in a soil and tlie tobacco grown thereon, and little rela- 

 tion was shown for phosphoric acid. 



Heavy soils with a low content of citrate-soluble phosphoric acid bore tobacco 

 with a lower phosphoric acid content than light soils. Parallel relations 

 existed between the content of available lime in soil and the lime content of the 

 corresponding tobacco. No relation was established between the chlorin and 

 potash content of tobacco and its burning qualities. The whiteness of the ash of 

 the tobacco increased with the lime content, but its relation with the magnesia 

 content was doubtful. 



Soil survey of Cowley County, Kansas, E. C. and R. H. Hall and B. W. 

 Tillman (U. S. Dept. Agr., Advance Sheets Field Operations Bur. Soils, 1915, 

 pp. 46, pis. 2, fig. 1, map 1). — This survey, made in cooperation with tlie Kansas 

 Agricultural College and Experiment Station, deals witli the soils of an area of 

 725,120 acres in southeastern Kansas, the surface of which is predominantly 

 undulating or gently rolling. The county lies in the Great Plains region. The 

 surface drainage is said to be generally good. 



The upland soils of the county are of residual origin and the stream bottom 

 lands of alluvial origin. Twenty-three soil types of nine series are mapped, of 

 wliich the Summit silty clay loam, the Summit silt loam, Crawford silt loam, 

 and Gerald silt loam cover 29.5, 13.2, 11, and 10.8 per cent of the area, respec- 

 tively. Chemical analyses are included of some of these soils. 



Report on Mecklenburg' County soils, agriculture, and industries, C. B. 

 Williams, W. E. Hearn, J. K. Plummer, and W. P. Pate {Bui. N. C. Dept. 

 Agr., 38 {1911), No. 4, pp. ^7, pi. 1, figs. 12).— This is No, 1 of the North Caro- 

 lina soil reports. It supplements the survey made in cooperation with the 

 Bureau of Soils of the U. S. Department of Agriculture (E. S. R., 29, p. 16), 

 and includes average chemical analyses of the soil types of the county, together 



