lo July, 191^.] Influcucc of Certain Soil Coi/siititciits. &c. 



39/ 



Tabu: JV. 



Test 

 Number 



Constituent Added. 



Xitrate Nitrogen per 1,000,000 parts 

 Dry Soil. 



Control 

 Blanks. 



Ammonia 

 Bottles. 



E.xcess with 

 Ammonia. 



Percentage 

 of added 

 Ammouia 

 Nil rifled. 



3 



4 



5 



(j 



7 



8 



9 



10 



11 



12 



13 



U 



15 



16 



17 



18 



Nothing 

 Carb. of lime 



Carb. of magnesia 



Gypsiiim 



Lime 



Ferric hydrate 

 Common .salt 



Citric acid 



Starch . . 

 Sugar 



Su]ierphosphate 



Tlie soil (.f tliese 4 Lotties was 



33-03 

 54 -00* 

 39-92* 

 38 -02 

 (if) -53 

 33-02 

 29-35 



3-92 

 38-02 

 2(5-37 

 26-37 

 26-37 

 10-93 

 Ml 

 10-93 



2-85 

 Nil 

 29-35 



108-99 



412-83* 



329-97* 



329-97 



299-97 



139-59 



131-97 



4-37 



13-09 



188-89 



(58 -90 



29-94 



70-09 



59-99 



55-84 



92-66 



Nil 



136-62 



75-96 

 358-83 

 2G0-G5 

 291-95 

 233-44 

 106-57 

 102-62 



162-52 

 42-53 

 3-57 

 59-16 

 59-99 

 44-91 

 89-81 

 Nil 



107-27 



22-79 



100-00 

 87 -01 

 87-60 

 70-03 

 31 -97 

 30-78 



48-75 

 1L"75 

 1-07 

 17-74 

 17-99 

 13 -47 

 26-94 



32-18 



nadvertently missed, and refilled alter 21 davs. 



WiilGHING THE MATERIALS. 



We may now procetd to consider the practical lessons of the.se experi- 

 ments. 



Carbonate of Lime. — This material had the best effect on nitrification 

 of all the substances tried. Xot only did it give the best result ulti- 

 mately, but its action was also the sDonest felt. It gave a better result in 

 fifteen days (Table TI.) than any other application in fifty-one days. 

 The quantity applied — 2 per cent. — is larger than would be' applied in 



