Feb.. 1927] PROGRESS OF AGRICULTURAL EXPERIMENTS 35 



extra nitrogen in manure. However, in the absence of manure, the 

 yield was generally lower. 



The yields of the urea plots were well above the average of the rest 

 of the nitrogen plots. Urea is the most concentrated nitrogen fertilizer 

 on the market analyzing 46 per cent available nitrogen. 



PLANT PATHOLOGY 

 Effect of Fungicides on Plants — (.4 daws Fund) 



Experiments have been continued in which the effect of increasing 

 the i)ercentages of lime in Bordeaux mixture on injury produced have 

 been studied. In the case of the a})ple, and using 1 per cent Bordeaux 

 mixtures in which the ratio copper to lime was 1:0:2; 1: alkalinity; 

 1:1; 1:2; 1:4; and 1:6; O. Butler finds that on the fruit the injury 

 produced is about ecjually intense at all ratios up to and including 1:2 

 but becomes negligible at a ratio of 1 :4 and above. The foliage of the 

 apple is less sensitive to cojiper injury than the fruit, but again some 

 injury is still produced when a mixtui-e containing a ratio of cojiper 

 sulphate to lime of 1:2 is employed. A ratio of 1:4 causes no injury. 

 The peach was found to he more sensitive than the ai)ple, and a ratio 

 of cop])ei- sulphate to lime of 1:6 was found necessai'y to prevent all 

 injury. 



Apple Scab — {Hatch Fund) 



Once scab has been thoroughly controlled in a Mcintosh orchard, is 

 it possible to reduce the number of sprayings given, from three to two? 

 To answer this question, one plot was sprayed by O. liutler with lime- 

 sulphur 1-50 at the pre-pink and calyx stages and another at the pre- 

 pink, pink and calyx stages. In the plot sprayed twice, scab lesions 

 on the fruit were noticeable; but in the plot sprayed three times the 

 scab lesions were small and would have passed unperceived unless 

 h)oked for. The ])er cent of scab found was as follows: 



Lime-stdphur 1-50 jire-pink and calyx . 13.78 

 Lime-sidphur 1-50 pre-i)ink, pink and calyx 5.00 



It was also found, in confirmation of a previous experiment, that when 

 a 2-2-50 Bordeaux mixture was used for the pre-pink and pink sprays 

 and lime-sulphur 1-50 for the calyx sprats the scab control obtained 

 was better than that gi\-cn by 1-50 lime-sulphur solution used for all 

 three sprayings, and equal to lime-suljiliur solution 1-50 used as pre- 

 pink, jiink, calyx and 14 days after the calyx spray. 



Bitter-Pit of Apple— f//aff/i Fund) 



In 1925 a large niunber of check trees in this experiment bore no 

 fruit, and the data obtained were therefore fragmentary. In 1924 com- 

 l)lete data were secured in all the plots, and fertilization taken as a 

 whole was found beneficial in 0.6 of the cases; in 1925, to consider the 

 Idiots furnishing comjilete data only, fertilization was beneficial in only 

 0.4 of the cases. In both 1924 and 1925, however, the plots fertilized 



