14 



The Effects of Radio-active Ores and Residues on Plant Life. 



SERIES 2. 



EXPERIMENTS WITH VEGETABLE MARROWS. 

 Variety Button's Tender and True. Sown May n. 



Notes during Growth. Germination was strong and even in all 

 sections. Four weeks after sowing, growth was strongest in Farmyard Manure 

 Control, which was only slightly superior to the Complete Fertiliser Control. 

 A month later saw the positions reversed, and the plants in the Complete 

 Fertiliser Control were not only the most healthy but were producing the 

 greatest number of fruits. 



The poorest trials were First Control (unmanured) and Pure Radium 

 Bromide. 



Plots dressed with Complete Fertiliser in addition to Radium did not 

 produce stronger growth than those which received no Fertiliser. In no case 

 did the plants in plots dressed with Radium alone, or with Radium and Complete 

 Fertiliser, appear so robust as those in the Complete Fertiliser Control. 



Final Notes. From the unmanured Controls the produce weighed 

 (First) 14 Ibs. 7 ozs., (Duplicate) 21 Ibs. 12 ozs., and the latter was exceeded 

 by only one section dressed with radio-active material (unmanured). The 

 greatest weight was realised from the Complete Fertiliser Control, viz., 31 Ibs. 



