MANURES 99 



of dung and artificials presented, any advantages. The results 

 were purely negative, as the following mean values show 



Artificials = 12 tons dung . . . 100 

 Dung, 12 tons . . . . 116 



Artificials = 24 tons dung 120 1 



- mean 114 

 Dung, 24 tons . 108 J 



Artificials = 12 tons dung + 12 tons dung 112 



As mentioned above, the application of dung increases the 

 longevity of the plant : this was evidenced by the mortality in 

 the variously manured plots at the end of seven years : that in 

 the unmanured plots and in those dressed with artificials was 

 the same, and amounted to 27 per cent., whereas that in the 

 plots dressed with dung was only 21 per cent. 



A careful analysis of the results was also made to see whether 

 the dressing had any effect on the date of ripening of the crop, 

 or on the length of the cropping period. But the results were 

 negative (IV, 23). The "percentages of the total crops gathered 

 during the first third of the pickings were found to be practically 

 identical throughout the five years over which the observations 

 extended 



No manure . . . . .28 per cent. 



Artificials . . . . . . 30 



Dung 29 



and the dates of the first pickings, as expressed in days from the 

 earliest date on which any picking had been recorded, were also 

 practically identical- 

 No manure ..... 0*7 days 



Artificials ...... 0*69 



Dung . . . . . . 0-63 



As to the average period in days over which the pickings 

 lasted, there was some slight superiority of the dressed over the 

 undressed plots, but no difference between those dressed with 

 dung and those dressed with artificials. 



No manure . . . . . . 13-5 



Artificials . . . . . . .14-1 



Dung ....... 14-2 



Two series of experiments were conducted on the application 

 of liquid dressings to strawberries during the swelling of the 



