63 



er failed to germinate, or made hut little growlli if 

 there was any germination. 



In view of the faet that our work indicated an in- 

 crease in the solnbility of manganese due to the use of 

 dried blood or ammonium sulphate, it was thought 

 worth while to study the iniluence of sulfofication on 

 the development of soluble manganese in acid soils. 

 In this experiment the same methods were used as in 

 the study of the effect of dried l)lood, 0.1 gm. of sul- 

 phur being used to each 100 gms. of air dry soil. The 

 soils were incubated at room temperature' from Nov. 

 16, 1917, to Jan. 30, 1918. They were then leached as 

 previously explained and manganese determinations 

 made. The data so obtained are set forth in Table 

 XIII. 



Table XUL—The Effect of Sulphur on the Develop- 

 ment of Soluble Manganese in Acid Soils. 



Source of Soil 



Treatment 



O 3 



Plainfield sand, Wis. 



Plainfield sand, Wis. 



Marstiall silt loam. Wis. 



Marshall silt loam. Wis. 



Plot 31, Penn. Agr. Exp. Sta. 

 Plot 31, Penn. Agr. Exp. Sta. 

 Plot 32, Penn. Agr. Exp. Sta. 

 Plot 32, Penn. Agr. Exp. Sta. 



Thomasville, Ala. 



Tliomasville, Ala. 



Leroy, Ala 



Leroy, Ala 



Boaz, Ala. 



Boaz, Ala. 



Clanton, Ala. 



None 



0.1 gm. sulphur 



None 



0.1 gm. sulphur 



None 



0.1 gm. sulphur 



None 



0.1 gm. 

 None _ 

 0.1 gm. 

 None - 

 0.1 gm. 

 None _ 

 0.1 gm. sulphur 

 None 



sulphur 

 sulphur 

 sulphur 



Clanton, Ala. 



Tanner, Ala. 



Tanner, Ala. 



Oxford, Ala. 



Oxford, Ala. 



Oxford, Ala. 



Plot 4, Ala. Exp. Sta.' . 

 Plot 4, Ala. Exp. Sta. .. 

 Plot 4, Ala. Exp. Sta. .. 

 Plot 4, Ala. Exp. Sta. _. 

 Plot 8, Ala. Exp. Sta.= . 

 Plot 8, Ala. Exp. Sta. .. 

 Plot 8, Ala. Exp. Sta. _. 

 Plot 8. Ala. Exp. Sta. . . 



10.1 gm. sulphur 



INone 



10.1 gm. sulphur . 

 [None 



1 0.1 gm. sulphur . 



10.2 gm. sulphur . 

 INone 



sulphur . 

 sulphur _ 



Trom source of nitrogen test. 

 Trom rotation experiments. 



0.1 gm 



0.2 gm 



O.lgm. sul. Igm. CaCOj^ 



None " 



0.1 gm, sulphur 



0.2 gm. sulphur 



. 1 gm. sul.. Igm.CaCOa 



None 



54.0 



trace 



54.0 



26.0 



182.0 



84.0 



1C8.0 



None 



160.0 



None 



40.0 



None 



38.0 



None 



52.0 



None 



104.0 



None 



68.0 



168.0 



3.6 



33.6 



39.6 



None 



None 



28.0 



54.0 



None 



