i6 



G. Dalkuliara'. and T. Iinacekl. 



filled with 200 g of humy soil from Nishigahara containing 30.53% H^O 

 and mixed with the following salts,^' dissolved in 250 cc. H^O, and organic 

 manures.^^ As general nutrients 0,5 g di-potassium-phosphate and 0,05 g 

 magnesium sulphate were added to each flask and kept at room temperature 



(i5-26°C). 



I. Ammonium sulphate-) 



II. Sodium nitrate , 



III. Ammonium nitrate 



{Sqdium rtitrate 

 Starch 



( Sodium nitrate 



^Compost well rotten (a) sterilized 



fSodium nitiate 



(Compost well rotten (b) not sterilized 



{Sodium nitrate 

 Rape cake 



{Sodium nitrate 

 Straw in powder 



Starch 



X. Compost well rotttn (a) sterilized... 

 XL Compost well rotten (t) sterilized... 

 XII. Rape cake 



XIII. Straw in powder , 



XIV. Control 



VI. 



YII. 



VIII. 



IX. 



1-25 g- 



2.00 „ 



1.25 ,. 



6.C0 „ 



1-25 ., 



6.00 „ 



1.25 ,. 



2.00 „ 



1.25 ,. 



6.00 „ 



2.00 „ 



6.00 „ 



6.03 ,, 

 2.CO „ 

 6.00 „ 



The experiment was carried out in duplicate. While one series served 

 for occasional testing the other served for the final determination. It was 

 observed that flasks containing starch, rape cake and straw showed the 

 strongest reaction for nitrate, and with the starch flask after 10 days from start, 



i). Nitrogenous manures subjected to this experiment contained the following percentage of N : 

 a) Ammonium sulphate 20.50 % N 



b) Ammonium nitrate .. 



c) Sodium nitrate 



f ) Rape cake 



e) Compost we' 1 rotten .. 



f) Straw... 



2). One g of precipitated magr.efiun 



34-80 „ „ 



15-55 .. M 



5-7° .... 



1.41 .. .. 



0.57 „ „ 



c; rbonate was added to neutralize the acidity of sulfuric 



acid. 



