420 



SUZUKI 



Table XV. In 100 parts of dry matter : — 



Plants treated with 



Original Control Ammonium Ammonium Sodium 



plants. plants. nitrate. carbonate. nitrate. 



Asparagine nitrogen 0.65 1.51 1.69 1.69 2.04 



Asparagine 3.07 7. 11 7.99 7.97 9.62 



Here, in the control plants, very much asparagine was 

 formed, this can only be due to the transformation of nitrates, 

 originally stored up in the plants, aided by the presence of much 

 sugar. Indeed in a second experiment the decrease of nitrates 

 stored up was plainly observed during this asparagine produc- 

 tion ; and in this case even less asparagine was noticed in the 

 plants nourished with ammonium salts. In these experiments, 

 five plants of similar size,' 1 ' were placed in the following solu- 

 tions : — ■ 



a, 0.1% solution of ammonium chloride (1.5 litre). 



b, ,, ,, ,, ammonium phosphate (1.5 litre). 



c, 0.2% ,, ,, sodium nitrate ( ,, ). 



d, distilled water. ( ,, ). 

 They were kept in the glass house. 



Time of experiments : — 7 days (Nov. 6-13). 



Temperature: — Min. 7°c; Max. 36°c. 

 After drying' 21 only the healthy stems and leaves were ana- 

 lyzed, with the following results. 

 Table XVI. In 100 parts of dry matter: 



Plants treated with 



Original Control Ammonium Ammonium Sodium 



plants. plants. chloride. phosphate. nitrate. 



Asparagine nitrogen 0.55 1.47 1.25 1.15 1.11 



Asparagine 2.57 6.92 5.90 5.40 5 21 



Xitrogen in nitrates. 0.83 0.41 — • — — 



(c). Experiments with Brassica campcsti-is, 

 var. " Taina. ,,{3) 

 Three experiments were made with this variety. 



I. Experiment (made on the field). 

 The young plants growing on the farm about 2O 0m high were 

 irrigated with the following solutions : — 



(1) The roots weighed 200 grams on an average; the leaves were 30-50 cm. long. 



(2) At the end of the experiments the plants in sodium nitrate and ammonium 

 phosphate began to suffer. The other plants were quite healthy. 



(3) This variety has very soft juicy leaves and very small roots. 



