1912.] Sterilisation of Soil for Glasshouse Work. 821 



(a)— Cucumber Sick Soil (B). 



— 



Un- 

 treated. 



Partially sterilised by 



Heat. 



Chemicals. 



200°. 



200° + 



basic 

 slag. 



130°. 



Toluol. 



Carbon 

 disulph- 

 ide. 



Relative plant weight, 



dried (leaves, stems, &c, 



no fruit) ... 

 Relative weight of fruit ... 

 Actual weight of fruit per 



plant, grams 

 Fruit produced per 100 



parts of dry plant weight 



100 

 100 



320 



1,280 



163 

 204 



654 

 I,600 



175 



225 



722 

 1,640 



125 

 129 



415 

 1,340 



139 

 119 



380 



1, 100 



116 

 124 



398 

 1,360 



Some club on untreated, not on other, soils. 

 (£)— Tomato Sick Soil (MC). 



100 



188 



178 



I 12* 



144 



138 



100 



255 



241 



159 



200 



179 



215 



550 



519 



343 



43i 



386 



1,360 



' 1,840 



1,840 



1,940 



1,900 



1,800 



Relative plant weight, 



dried (leaves, stems, &c, 



no fruit) ... 

 Relative weight of fruit ... 

 Actual weight of fruit per 



plant, grams 

 Fruit produced per 100 



parts of dry plant weight 



* Heated to 120 0 only. 

 (c)— Tomato Sick Soil (MT). 



Relative plant weight, 



dried (leaves, stems, &c, 



no fruit) ... 

 Relative weight of fruit ... 

 Actual weight of fruit per 



plant, grams 

 Fruit produced per 100 



parts of dry plant weight 



Both in (/>) and (c) very much club on untreated soil, some on soils treated with 

 toluol and carbon disulphide and heated to 120 0 , very little on soil heated to 130 0 F., 

 and none on soil heated to 200 0 F. 



100 



170 





103 



107 



100 



161 





116 



133 



446 



720 





5i8 



595 



1,575 



1,525 





i,775 



i,975 



(d) — Tomato Sick Soil (Fed on two occasions). 



Relative plant weight, 

 dried (leaves, stems, &c. , 



no fruit).. 100 144 — no 



Relative weight of fruit ... 100 118 109 

 Actual weight of fruit per 



plant, grams 587 692 — 643 



Fruit produced per 100 



parts of dry plant weight 2,340 i,86o — j 2,320 



Some club on untreated soil, none on heated soils. 



