210 Brenda Sutherland: Phosphate Fertilisers. 



The lour main points to be noted in the tabulated figures are : — 



< I i Metaphosphate gives in all cases a better crop than superphos- 

 pbato. but with some plots the difference is negligible. 



(2) Pyrophosphate is in every case less satisfactory than super- 

 phosphate. 



(.'5) .Metaphosphate applied as a top dressing in spring does very 

 little good. Apparently the value lies in the initial start to the 

 very young plant. 



(4) In the case of brown oats, which grow rapidly, the advantage 

 of using metaphosphate is very marked. This suggests that further 

 experiments might be tried to find its value with rapidly growing 

 crops, vegetables, etc. 



We unfortunately lost the opportunity of determining yield of 

 grain as distinct from total produce. The plants were damaged by 

 a tornado to an extent which made threshing impossible. This 

 point, and the question as to whether composition and quality of the 

 grain is altered by the use of metaphosphate, are still unapproached. 



In conclusion I desire to express my thanks to Dr. Heber Green, 

 in whose department I worked, for continued advice and assistance. 



