CITY STEEET SWEEPINGS AS A FERTILIZER, 



in untreated soil. The sweepings and manure were used at the rate 

 of 5 tons per acre. The tests were conducted in a greenhouse, where 

 the conditions of temperature and moisture could be controlled. 

 When the plants had grown for 30 days they were cut and the green 

 weight recorded. Three pots were used for each treatment, six 

 plants in each pot. 



TABLE II. -Growth of wheat in soil treated with street sweepings and stable manure. 



The figures in this table show the sweepings to be beneficial, espe- 

 cially sample No. .1. In this case the growth was improved 31 per 

 cent. In sample No. 2 there was a gain of 10 per cent, and in sample 

 No. 3 a gain of 5 per cent in growth. The beneficial effect of stable 

 manure was, however, much greater than that of any of the three 

 sweepings ; the growth in this case was increased 46 per cent, which 

 seems to indicate that while the sweepings are beneficial they are 

 not as efficient as good stable manure. 



Another test was made in which corn was grown in the soil treated 

 with street sweepings and stable manure, the manurial treatments 

 and general methods being the same as in the first experiment. 

 Results which substantiate those obtained in the latter were secured. 

 The green weight is given in the table below. 



TABLE III. Growth of corn in soil treated with street sweepings and stable manure. 



There was an increased growth with samples No. 1 and No. 2, but 

 a decrease where sample No. 3 was used. Again the stable manure 

 had a more beneficial effect than the best of the sweepings. The 

 growth is shown in the cut in figure 1. 



Another culture test was made, using a vegetable (radish) as the 

 plant on which to test the effect of the street d6bris. The growth of 

 plants in this experiment is shown in the cut in figure 2. Pot 1 

 is the untreated soil, pot 2 is treated with the machine sweepings 

 (sample No. 2), pot 3 is treated with the hand sweepings (sample No. 

 1), pot 4 is treated with the decomposed sweepings (sample No. 3), 



