26 



Journal of Agricultural Research 



Vol. XII. No. r 



Table IV. — Effect of ammonium sulphate and nitrate of soda on the H-ion concentration 



of field-soil suspensions 



EFFECT OF POTASSIUM SULPHATE ON SOIL REACTION 

 Skinner and Beattie {13) and others have observed that potassium 

 sulphate increased the lime requirement of soils. Measurements have 

 been made of the H-ion concentration of soil suspensions from plots to 

 which have been added different amounts of this salt. These data are 

 given in Table V. 



Table V. — Effect of potassium sulphate on the H-ion concentration of field-soil sus- 

 pensions 



Branch sta- 

 tion. 



Buncombe . 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Iredell 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Edgecombe 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Year 



of 

 begin- 

 ning 

 ejcperi- 

 ment. 



Soil type. 



191 1 

 1911 

 191 1 



1911 

 1911 

 1911 

 1911 

 1911 

 1903 

 1903 

 1903 



1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 



1903 

 1903 

 1903 

 1903 

 1903 



Porter's loam. 



....do 



....do 



do 



do 



do 



do 



do 



Cecil clay loam. 



do 



do 



.do. 

 .do. 

 .do. 

 .do. 

 do. 



Norfolk fine sandy loam 



do 



do 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 



Depth. 



Inches. 



0-& 



8-24 



8-24 



0-8 



8-24 



0-8 



S-24 



0-8 



8-36 



0-8 



8-36 



0-8 



8-36 



0-8 



0-36 



0-8 



8-24 



0-8 



8-24 



0-8 



8-24 



0-8 



8-24 



Treatment. 



Dried blood 



do 



Dried blood, potassium 



sulphate. 



do 



Potassium sulphate 



do 



Untreated 



....do 



Dried blood 



....do 



Dried blood, potassium 



sulphate. 



do 



Potassium sulphate 



do 



Untreated 



....do 



Dried blood 



...do 



Dried blood, potassiimi 



sulphate. 



....do 



Potassium sulphate 



....do 



Untreated 



....do 



Volt- 

 meter 

 read- 

 ings. 



0.656 

 .654 

 .623 



.623 

 . 609 

 • 596 

 .648 

 .651 

 .682 

 . 671 

 .630 



.618 

 .621 

 .608 

 .676 

 . 672 

 .632 

 . 620 

 . 602 



•S90 

 •596 

 . 600 

 •634 

 .628 



H-ion con- 

 centration. 



Gram- 



nwlecules 

 per liter. 

 o. 2X10-5 

 .3X10-5 

 .iXio-< 



.iXio-< 

 .1X10-* 

 .3Xio-< 

 .3X10-6 

 .3X10-5 

 . I X 10-8 

 .1X10-5 

 .8X10-5 



.1X10- 

 .1X10- 

 .1X10- 

 .1X10-' 

 .iXio- 

 .7X10- 

 .iXio- 

 .2X10-' 



.3X10- 



.3X10 



.2X10- 



.6X10-5 



.8X10-5 



