40O 



salt is only superficially worked in so that the sun and wind have abundant 

 access to it. Then the free ammonium carbonate, produced by the trans- 

 formation of the fixed ammonium sulfate, can be removed from the field 

 very quickly, 



Sandy soils, which at the time are rich in calcium, are on this account 

 not suited for an ammonia fertilization, especially not as a top dressing. 

 This explains why quick lime should not be brought directly into contact 

 with stable manure or other ammonium fertilizers. 



Ik'sides these reactions, lime also acts on phosphoric acid. This action 

 must not be underestimated. The action of the phosphoric acid on super- 

 ph()si>hate. which is soluble in water, is impaired by the simultaneous use 



Supeiphosphate 



riiomas slag 



Stable manure and 

 g-uano 



Chile Saltpetre 



Fig-. GO. Diagrammatic representation of the favorable and unfavorable mutual 

 relations of fertilizers to each other. 



of lime ; but not so much so as the phosphoric acid in Thomas slag, soluble 

 in citric acid. The destructive efifect of lime on phosphoric acid is greatest 

 when used with ground bone. 



It may be the place here to refer to the mutual relation of fertilizers in 

 order to avoid using them in such a way as to impair their action. Instead 

 of more lengthy descriptions we will reprint a figure borrowed from the 

 "Practical Advisor in Fruit and Garden Culture," 1906, No. 17^ 



In this diagram, the thin connecting lines signify that the various kinds 

 of fertilizers may always be mixed together. The fertilizers, which appear 

 connected by double lines, may be mixed with one another only very shortly 

 before spreading; while those fertilizers connected in the figure with thick 

 lines may never be mixed together. 



1 "Praktischen Ratgeber im Obst- und Gartenbau." No. 17, 1906. 



