572 



Journal of Agriculture. 



[lo Sept., 1908. 



reasonably have been expected to have assisted the other manures. The 

 inutility of potash is most marked in the proportions of marketable and 

 unmarketable tubers in section D. The further addition of sulphate of 

 ammonia in section E, while it has not arrested the falling off in yield, 

 has apparently had some effect upon the size of the tubers. 



Fields at Allansford, Drouin, Kilmore. Xeerim, Trafalgar, 

 Trentham, Colac, and Kikglake. 



The manure dressings upon fields in the above localities have been upon 

 conventional lines and the results may be looked upor? as answers to direct 

 questions regarding soil deficiencies. The soils were very dissimilar in their 

 natural content of plant foods, and physical condition, prior to the experi- 

 ment ; but any divergence in this direction from the general average is 

 probably reflected in the contrasts shown between the results of individual 

 fields and the average of the whole group. 



In order to render the effects of different manure dressings upon the 

 proportions of marketable and unmarketable tubers more easily under- 

 stood, the following table shows the percentages of both for each 

 section. The figures clearly show that where potato land is unmanured, as 

 in section C, or insuflficientlv manured, as in .section A, the proportion of 

 unmarketable tubers increases. With better fertilisation, sections B, D and 

 E show progressive improvement. 



