MANURES 07 



of a bulky, comparatively inert, material, such as chaff, itf a 

 dressing of artificials (equivalent to 30 tons of dung to the acre), 

 would result in the artificials having the same effect as dung, 

 which it might do, if the advantage of dung lay merely in its 

 lightening the soil. But the chaff had no effect in increasing 

 the crops, either in the absence or presence of artificials. Thus 



Relative 

 crops. 



No manure ....... ioo\ 



, but chaff . 97 J 



Artificials alone ...... 159) 



and chaff 153} 



RESULTS WITH CURRANTS AND RASPBERRIES 

 (Reports, II, 98 ; IV, 45 ; XVI, 38) 



Owing to the incidence of disease and other troubles, the 

 original experiments with these were not continued long enough 

 (only three to five years) to show whether their behaviour was 

 similar to that of gooseberries ; but it probably was, for such results 

 as were obtained bear a close resemblance to those yielded by 

 the first series of experiments with gooseberries during the first 

 five years over which that series extended. 



Artificials. Dung. 



No = 12 tons = 30 tons 12 30 

 manure, dung. dung. tons. tons. 



Black currants (1897-9) I0 IO ^ I 37 I 49 I2 5 



Red currants l (1897-1901) 100 114 128 161 214 



Raspberries (1898-1901) 100 126 102 130 195 



Gooseberries (1897-1901) 100 91 107 132 131 



The general results show that some increase is caused by 

 artificials, but a considerably greater increase by dung. 



Other experiments with these plants are in progress. 



The question has also been investigated as to whether the 

 addition of artificials to dung is capable of enhancing the effect 

 of the latter in the Ridgmont soil, as it seems to have done else- 

 where, according to the results of Dyer and Shrivell. 2 Two 

 series of experiments with red currants, extending over seven 



1 Mean of results from the crops and the weight of the bushes. 



2 B. Dyer and F. W. E. Shrivell, " The Manuring of Market Gardening 

 Crops." London, 1913. Also Jour. Roy. Hort. Soc., 1903, xxvii, pp. 995- 

 1059. 



IT 



