Jan. 7, 1918 



Studies in Soil Reaction 



27 



Slight increase in the H-ion concentration was obtained from the 

 plots to which potassium sulphate had been applied. However, nothing 

 like as marked an effect in producing "true acidity" is found on these 

 plots as those to which have been added ammonium sulphate. Why 

 this should be is not clear, unless it has been caused by nitric acid devel- 

 oped by the soil organisms. 



EFFECT OF ACID PHOSPHATE AND LIME ON SOIL REACTION 



Table VI gives the results from the plots which have received annual 



applications of acid phosphate and lime. 



Table VI. — Effect of acid phosphate and lime on the H-ion concentration of field-soil 



suspensions 



Branch sta- 

 tion. 



Buncombe . 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Iredell 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Edgecombe 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Year 



of 

 begin 



ning_ 

 experi- 

 ment. 



191 1 

 19 1 1 

 1911 

 1911 

 1911 



1911 

 1911 



1911 

 1911 



1911 

 1911 

 1911 

 1911 

 19H 

 1903 

 1903 

 1903 

 1903 

 1903 



1903 

 1903 



1903 

 1903 



1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 

 1903 



1903 

 1903 



1903 

 1903 



1903 

 1903 

 1903 

 1903 

 1903 



Soil type. 



Porter's loam. 



...do 



....do 



....do 



....do 



.do. 

 .do. 



do. 

 do. 



do 



do 



do 



do 



...do 



Cecil clay loam. 



...do 



....do 



do 



....do 



.do. 

 .do. 



.do. 

 -do. 



do. 

 .do. 

 .do. 

 .do. 



do. 



Norfolk fine sandy loam. 



do 



do 



do 



do 



do. 

 .do. 



.do. 

 .do. 



do. 

 .do. 

 .do. 



do. 

 .do. 



Depth. 



Inches. 

 0-8 

 8-30 

 0-8 

 8-30 

 0-8 



8-30 

 0-8 



8-30 

 0-8 



8-30 



0-8 



8-30 



0-8 



8-30 



0-6 



6-30 



0-6 



6-30 



0-6 



6-30 

 0-6 



6-30 

 0-6 



6-30 



0-6 



6-30 



0-6 



&-30 



0-6 



6-24 



0-6 



6-24 



0-6 



6-24 

 0-6 



6-24 

 0-6 



6-24 



0-6 



6-24 



0-6 



6-24 



Treatment. 



Dried blood 



.....do 



Acid phosphate 



.....do 



Dried blood, add phos- 

 phate. 



.....do 



Dried blood, acid phos- 

 phate, potassimn sul- 

 phate. 



do 



Dried blood, acid phos- 

 phate, potassium sul- 

 phate, lime. 



do 



Lime 



do 



Untreated 



.....do 



Dried blood 



.....do 



Acid phosphate 



.....do 



Dried blood, acid phos- 

 phate. 



do 



Dried blood, acid phos- 

 phate, potassium sul- 

 phate. 



do 



Dried blood, acid phos- 

 phate, potassium sul- 

 phate, lime. 



do 



Lime 



do 



Untreated 



...do 



Dried blood 



...do 



Acid phosphate 



...do 



Dried blood, acid phos- 

 phate. 



...do 



Dried blood, acid phos- 

 phate, potassium sul- 

 phate. 



...do 



Dried blood, acid phos- 

 phate, potassium sul- 

 phate, lime. 



....do 



Lime 



....do 



Untreated 



....do 



