96 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



Table I. — Showing influence of proximity to plant roots upon germ con- 

 tent of the soil.* Bacteria per gram. 



t Remote from 



Adjacent to roots one 



Plant. roots. or more feet. 



Currant 1,445,000 1,270,000 + 



Asparagus 2,200,000 675,000 + 



Grass 29,850,000 5,450,000 + 



Iris 5,150,000 4,800,000 + 



Raspberry 4,560,000 1,890,000 + 



Rhubarb 3,600,000 970,000 + 



Cabbage 8,085,000 740,000 + 



Plum 1,335,000 595,000 + 



Apple 3,200,000 1,345,000 + 



Pea 1,770,000 1,520,000 + 



Tomato 790,000 525,000 + 



Rhubarb 1,035,000 465,000 + 



Bean 63,500 59,500 + 



Tomato 1,086,000 530,000 + 



Sunflower 164,000 1,105,000 — 



Potato 385,000 410,000 — 



Potato 500,000 670,000 — 



Cabbage 245,000 325,000 - 



Cauliflower 213,000 504,000 — 



Rhubarb 270,000 80,000 + 



Tomato 565,000 80,000 + 



Asparagus 84,000 66,500 + 



Currant 275,000 177,500 + 



Gooseberry 108,000 80,500 + 



Hemp 6,500 500 + 



Squash 930,000 114,000 + 



Mangel 31,000 16,000 + 



Tobacco 61,500 6,500 + 



Strawberry 40,000 28,000 + 



Cabbage 62,500 9,000 + 



Grape 131,000 120,000 + 



Cauliflower 72,000 40,500 + 



Total . . : 67,313,000 24,667,500 



Table II. — Influence of soil extracts from sterilized soils in which 

 had been grown upon the growth of corn seedlings. 



certain organisms 



* These results are compiled from data secured by Mr. B. Hammer and Mr. Eldredge. 

 t Greater number adjacent to roots indicated by -f- ; less number by ■ — . 



