SCIENCE BULLETIN, No. 10. 



Table III. Showing Results of Manurial Experiments with Superphosphate. 



Results marked with an asterisk (*) were obtained fivm farms other than those from which the 

 actual soil samples used were taken. 



From this table it is seen that the soils from the localities chosen give 

 results which in general correspond to the average results obtained in the 

 three divisions, and quoted at the commencement of this paper : those from 

 the Southern Division are responsive; the Western soils show a decrease in 

 responsiveness as we proceed from south to north; while in the North-West 

 the soils are unresponsive to the phosphatic fertiliser. 



Two or three of the soils call for special comment. With regard to Soil 

 No. 22 from Narrandera, Professor Watt states that the paddock in 

 question had been cropped with wheat for a number of years and practi- 

 cally abandoned as exhausted. No superphosphate had .ever been used on 

 the farm. Last year the crop was an entire failure on the unmanured 

 portion, while the manured section gave a return of 12 bushels per acre. 

 This great difference was largely explained by the contrast in root develop- 

 ment in the two cases. 



Soil No. 21 from Mungeribar has given conflicting results. In 1909 

 the application of superphosphate- was responsible for a decreased return, 

 while in 1911 the manured plots showed an increase of 5 bushels. The soil 

 is termed by Mr. H. C. Wilson, late Inspector of Agriculture for the 

 Western Division, an unresponsive one. 



Keferring to Soil No. 6 from Tamworth, Mr. A. H. E. McDonald, 

 says : " I am told that this soil has been cropped for fourteen years. Super- 

 phosphate (56 lb. per acre) was used last year on immediately adjacent 

 soil with very gcod results. More grain was obtained and the sample was 

 much better." 



