EXPERIMENTS CONDUCTED WITH A VIEW TO CONTROLLING DISEASE. 57 



TABLE XXV.- SUMMARY OF THESE YEARS' EXPERIMENTS. EIGHT TREES IN EACH OF 



THE THIRTEEN PLOTS. 



VJol^l T>oy nonf Pi+torl 



Total Per cent. Pitted 

 Pitted. for 3 years. 



Totals 2675 12909 11037 



14 



15 

 16 



Totals 



112 

 139 



287 



538 



378 

 468 

 976 



1822 



318 

 394 



488 



1200 



26621 



CHECK PLOTS No MANURE. 



808 

 1001 

 1751 



3560 



40 

 42 

 39 



5 



7 

 9 



21 

 15 

 23 



849 

 545 

 787 

 448 

 282 

 810 

 254 

 657 

 1097 

 841 

 276 

 251 

 264 



7361 



132 



152 

 320 



604 



40 

 26 

 36 

 25 

 20 

 35 

 17 

 25 

 35 

 30 

 16 

 16 

 19 



16 



15 

 18 



SUMMARY FOR THREE YEARS. 



There is a decided difference in the average yield per tree between the manured and unmanured 

 plots. The manured plots (104 trees) yield an average of 256 Ibs.; while the unmanured plots (24 

 trees) only gave an average of 148 Ibs. per tree. 



On the other hand, the percentage of Pit is greater in the manured (27 per cent.) than in the 

 unmanured plots (17 per cent.), but as already pointed out, this may be correlated with the light crops 

 and the small size of frait. 



The heaviest yield is in plot 9, with superphosphate and ammonia ; but the next is plot 10, 

 with a combination of potash, bonedust, and sulphate of iron. 



The smallest yield is in plot 13, with limestone and green manuring ; but this does not differ 

 much from that of plot 5, with potash, ammonia, and Thomas' phosphate. 



The amount of Pit varies from 40 to 16 per cent., and while the highest percentage is wi*h a 

 complete fertilizer, the lowest is with sulphate of iron. 



The Pit is worst in plot 1 , with a complete- fertilizer ; and least in the sulphate of iron plot and the 

 plot which had only green manuring last season. 



The highest yield is in plot 9, with superphosphate and ammonia ; and the lowest in plot 13, with 

 limestone and green manuring. 



THE INFLUENCE OF FERTILIZERS ON BITTER PIT. 



A summary has been given at the end of each set of experiments, which shows that the effect 

 of the various treatments on the yield and Pit is very variable. Thus in Victoria and New South 

 Wales superphosphate, potash, and ammonia produced the largest yield ; while in Queensland it 

 was superphosphate and potash ; in West Australia, superphosphate and ammonia ; and in South 

 Australia, superphosphate alone (Table XXVI-)- 



