Jan. 7, 1918 



Studies in Soil Reaction 



21 



Table I. — Hydrogen-ion concentration of soil suspensions 



Sample 



No. 



Soil type.a 



Depth. 



Volt- 

 meter 

 readmgs. 



H-ion concen- 

 tration. 



1565 

 1566 

 1067 

 1068 

 1501 

 1502 

 1287 

 1288 

 1397 

 1398 

 1483 

 1484 



1344 



1345 



991 



992 



1552 

 1029 

 1030 



1519 

 1520 

 1499 

 1500 

 1352 

 1353 

 1287 

 1288 

 I125 

 I126 

 1261 

 1262 



1337 

 1205 



1333 

 1322 



1323 

 1435 

 1436 

 1121 

 1122 

 1344 

 1345 

 1328 

 1329 



1257 

 1258 



395 

 396 

 397 

 398 

 639 

 640 

 6652 

 653 



Norfolk sand (sand-hill phase). 



....do 



....do 



....do 



Norfolk coarse sandy loam .... 



....do 



....do 



....do 



Norfolk sandy loam 



....do 



....do 



....do 



Norfolk line sandy loam 



....do 



....do 



....do 



Norfolk very fine sandy loam. 



do 



do 



do 



Norfolk silt loam 



do 



do 



do 



Cecil coarse sandy loam 



do 



do 



do 



Cecil fine sandy loam'. 



do 



do 



do 



Cecil clay loam 



do 



do 



do 



Cecil clay 



do 



do 



do 



Iredell fine sandy loam 



do 



do 



do 



Iredell loam 



do 



do 



do 



Porter's sand 



do 



do 



do 



Porter 's sandy loam 



do 



do 



do 



Porter's loam 



Inches. 

 0-4 

 4-21 

 0-4 

 4-18 

 0-6 

 6-28 

 0.6 

 6-26 

 0-7 

 7-28 

 0-7 

 7-28 

 0-6 

 6-36 

 0-6 

 6-36 

 0-6 

 6-24 

 0-8 

 8-30 

 0-6 

 6-28 

 0-6 

 6-32 

 c^7 

 7-20 

 c^6 

 6-30 

 0-8 

 8-24 

 0-8 

 8-26 

 0-6 

 6-30 

 0-6 

 6-36 

 0-7 

 7-20 

 0-6 

 6-36 

 0-6 

 6-36 

 0-8 

 8-24 

 0-8 

 8-24 

 0-6 

 6-26 

 0-6 

 6-20 

 0-6 

 6-20 

 0-7 

 7-28 

 0-7 



7-30 

 0-8 



700 

 684 

 712 

 706 

 684 

 684 

 696 

 681 

 674 

 668 

 662 

 674 

 660 

 671 



645 

 640 



657 

 660 

 614 

 583 

 574 

 568 

 560 



555 

 712 

 699 

 706 

 700 

 702 

 681 

 699 



673 

 652 

 666 

 659 

 643 

 641 

 582 

 646 

 607 

 732 

 738 

 711 

 704 

 692 



714 

 684 

 679 



673 

 668 

 640 

 638 

 648 

 641 

 656 

 649 

 644 



Gram mole- 

 cules per liter. 



o. 4X10"^ 



9X10-6 



3 X 10-6 

 3X10-6 



9X10 6 

 9X10-8 

 5X1O-S 



oX 10-6 



I X 10-5 



I X 10-5 

 2 X 10-5 

 I X 10-5 



2 X 10-5 



I X 10" 

 4x10-5 



5x10-5 

 2x10-5 



2 X 10-5 



I X 10-4 



5x10-4 

 7x10-4 



9Xio~4 

 I X lo-a 

 1X10-* 

 3X10-8- 

 5X10-8 

 3X10-6 

 4X10-6 

 4X10-8 



oXlO-8 



4x10-6 



I X 10-5 

 3X10-5- 



I X 10-5 



2 X 10-5 

 5X10-5 

 5X10-5 

 5X10-4 



4X10 5 



I X 10-4 



I X 10-6 



I X 10-8 



10-8 



10-6 



10-6 



3X1 



4Xj 

 6X: 



2 X 10-6 

 9X10-6 



I X 10-5 

 I X 10-5 

 I X 10-5 

 5x10-5 

 5x10-5 



3X10 5 



5x10-5 



2 X 10-5 



3x10-5 

 4x10-5 



1 The writer is indebted to Dr. W. H. Mclntire, of the Tennessee Agricultural Experiment Station, for 

 the samples of the treated soils. 



