86o 



Journal of Agricultural Research 



Vol. XX, No. ii 



Table II.— Initial reaction of the soil and the number of cubic centimeters of N/25 calcium 

 hydro xid used to change the reaction to the figures given — Continued 



GROUP II, SOILS WHOSE REACTION WAS BETWEEN Ph 8.3 AND Pa 7 



Soil 

 No. 



1039 

 1219 

 1120 

 1047 

 1132 

 1268 

 1267 

 1072 

 1160 

 "57 

 1070 

 1131 

 1121 

 1162 



County. 



Russell 



Greenwood. . 



Finney 



Brown 



Shawnee. . . . 

 Montgomery 



...do 



Harper 



Reno 



....do 



....do 



Shawnee. . . . 



Finney 



Reno 



Soil type. 



Summit silty clay loam. . . . 



Osage loam 



Sandy loam 



Silt loam (bottom) 



Osage silty clay loam 



Osage clay (alfalfa land) . . . 



Osage silt clay loam 



Brown loam 



Arkansas fine sand 



Arkansas clay loam 



Pratt loam 



Osage very fine sandy loam 



Finney clay 



Pratt fine sandy loam 



Initial 

 Ph. 



8.03 

 7. Si 

 7-5° 

 7-49 

 7-45 

 7.40 

 7-36 

 7.28 

 7.26 

 7. 26 



7- 2 2 



7.19 



Cubic centimeters of Ca(OH)« 

 required to titrate to — 



Pu 7. 



Ph 8.3. 



Ph 10. 



GROUP III, SOILS WHOSE INITIAL REACTION WAS MORE ACID THAN IS INDICATED BY Pu 



1287 

 "43 

 1191 

 1 190 

 1285 

 1243 

 I23O 

 I0S8 

 II48 

 1266 

 I271 

 I284 

 II4I 

 "j5 

 1232 

 1136 

 1256 

 1279 

 1263 

 1277 

 1280 

 1273 

 1257 

 1293 

 1275 

 1233 

 1244 

 1239 



Montgomery 

 Shawnce. . . . 



Jewell 



....do 



Montgomery 



Cherokee 



....do 



Doniphan. . . 



Reno 



Montgomery 



....do 



....do 



Shawnee. . . . 



....do 



Cherokee. . . . 

 Shawnee. . . . 

 Greenwood . . 

 Montgomery 



....do 



....do 



....do 



....do 



Greenwood. . 

 Montgomery 



....do 



Cherokee 



....do 



.. do 



Summit silty clay loam. . . . 

 Boone fine sandy loam 



Colby silt loam 



Jewell silt loam 



Crawford loam 



Cherokee silt loam 



Neosho silt loam 



Brown silt loam 



Dune sand 



Bates very fine sandy loam 



Bates loam 



Crawford loam 



Summit silty clay loom. . . . 

 Crawford silty clay loam . . . 



Bates silt loam 



Oswego silt loam 



Boone fine sandy loam 



Bates very fine sand 



Cherokee silt loam 



Bates shale loam 



Bates loam 



Bates very fine sandy loam 

 Summit silty clay loam. . . 



Bates stony loam 



Oswego silt loam 



Oswego silty clay loam 



Bates fine sandy loam . 

 Summit silt loam 



13.0 



7-9 

 12.5 

 14. I 



8.9 



10. 2 

 4-2 



"•5 

 20. 2 

 4-7 

 31-4 

 35-2 

 16. I 

 30.6 

 29. 6 



11. 7 

 23.2 

 29-3 

 13- S 

 24.1 

 35-3 



9-1 

 18.8 

 25. 2 

 24.0 

 31-0 



CLASSIFICATION ON THE BASIS OF REACTION 



When the data obtained, both in the calcium determinations and the 

 electrometric measurements, were brought together it was found con- 

 venient to classify the soils into three groups. In group I were placed 

 those soils whose initial reaction was more alkaline than is indicated by 

 P H 8.3. In group II were placed those soils whose initial reaction were 

 less alkaline than is indicated by P H 8.3 but more alkaline than is indi- 

 cated by P H 7- In group III were placed those soils whose initial reac- 

 tion was more acid than is indicated by P H 7. In arranging the soils 

 within these groups the figures in Table I are given according to decreas- 

 ing amounts of calcium soluble in N/i hydrochloric acid. In Table II 

 the soils are arranged according to decreasing alkalinity, or increasing 

 acidity, as expressed by the P H values. 



