58 



BITTER PIT INVESTIGATION. 

 TABLE XXVI. INFLUENCE OF MANURES ON YIELD AND PIT. 



Again, in Western Australia every treated plot showed an increase in yield over the average 

 of the unmanured plots ; while in New South Wales the highest average yield of the season was in 

 one of the unmanured plots. These results emphasize the fact that they have only a local significance, 

 and that the question of manuring depends so much on local conditions, the nature of the soil, the 

 amount of rainfall, the age of the trees, etc., that the most profitable fertilizer for a particular orchard 

 can only be determined by actual tests. But these experiments were undertaken mainly with the 

 view of testing the influence of fertilizers on Bitter Pit, and a tabulated statement, showing their 

 relation to the percentages of Pit in each State, will help to make this influence clear. 



TABLE XXVII. PERCENTAGE OF PIT IN RELATION TO MANURES. 



Bathurst Stanthorpe Blackwood Mt. Barker 



MANURES. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11- 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 



Box Hill 



(V.) 

 Per cent. 



Superphosphate, potash, ammonia 



,, ,, ,, + Special bonedust 11 



,, ,, +Lime 



Superphosphate, ammonia, and kainit . . . . 10 



Superphosphate and potash . . . . . . 4 



,, ,, ,, + Alternate green manuring 6 



,, ,, ,, + Limestone .. 



Superphosphate and ammonia . . . . . . 8 



Superphosphate and lime 



Superphosphate alone . . . . . . . . 



Potash and ammonia . . . . . . . . 



>; ,, ,, + Special bonedust .. 

 ,, ,, ,, + Thomas' phosphate 



>, ,, ,, +Limestone . . . . 



Potash, sulphate of Iron, and special bonedust 



Sulphate of iron alone 9 



Lime alone ...... 



Limestone alone . . . . . . . . g 



with green manuring alternately . . 



Green manuring alternately . . . . ' 



Stable manure ...... 



Unmanured . . . . . . 17 



(N.S.W ) 

 1'er cent. 



5.6 



3-0 



6.3 

 4.4 



4-5 

 6-2 



(Q.) 

 Per cent. 



24 



(S.A.) 

 Per cent. 



3 



21 



(W.A.) 

 Per cent. 



40 

 26 



15 



4 



25 



5 25 



35 



7 4 35 



3 



2 



3 

 16 36 



20 



30 



16 



5 



9 



9 



3 



4 



17 

 19 

 16 



17 



If we take a broad and general view, and compare the manured with the unmanured plots as 

 regards Pit, it is found that at Blackwood, where there is very little Pit, there is practically no differ- 



