117 



Hksi'i.ts of Pot Tksis Condlctkd on Xohioi.k Sandy 

 Loam Soil From "Cullers Field." 



In the cxperiiiu'iils coiuhiclcd during the fall and 

 winter of 1913-1911, the various materials used were 

 applied alone to the four soils used in Ihe work. As 

 this early work developed, it hecame clear that a 

 coinpk'te lertilizer was needed to ohtain large yields, 

 no matter what type of soil was l)eing studied. Lime, 

 kainit, and acid phosphate, either singly or in combi- 

 nation, increased the yields of oats and corn very little. 

 But when nitrate of soda was added to the mineral fer- 

 tilizers, abundant growths w'cre easily obtained. It also 

 developed that ])yridine and quinoline were not only 

 not toxic, but were beiielicial when applied to either 

 oats or corn; and that the benefit was greater when 

 used in connection with phosphate and potash than 

 \\hen us(>d alone. Therefore, the bulk of the work 

 done llie second year aimed to show the effect on 

 plant growth of the various compounds at hand, when 

 used alone and also in connection with various fertili- 

 zer combinations. A lack of greenhouse space and of 

 pots made it necessary for us to confine the study to one 

 soil. The soil chosen was the poorer grade of Norfolk 

 sandy loam designated "Cullers Field" soil in the fore- 

 going j)ages. The fresh sample used was collected, 

 dried and potted in the manner already described. 



