The Effects of Radio-active Ores and Residues on Plant Life. 13 



SERIES 1-continued. 

 NOTES ON RADISH EXPERIMENTS. 



Within a week from date of sowing the trials in soil dressed with Lignaite, 

 Coal Dust, Nirama, Slime or Mine Residue, Pitchblende Concentrates, Ore A, 

 and Pure Radium Bromide, showed an undoubted superiority in strength of 

 growth over all others, although there was little difference to be observed 

 between any of those named. 



TRIALS IN SAND. 



Notes during Growth. All the plants were extremely weak. The Controls 

 dressed with Farmyard Manure and with Complete Fertiliser produced the 

 sturdiest foliage. 



Final Notes. On weighing the roots the yield from the unmanured 

 Controls was 2 ozs. and 3 ozs. respectively. From the pots dressed with 

 radio-active materials the weights varied from 2\ ozs. to 5 ozs., thereby claiming 

 some slight advantage. But all were far below the First Control dressed 

 with Complete Fertiliser with 14^ ozs., and the Duplicate Control dressed with 

 Farmyard Manure with 13! ozs. 



TRIALS IN SOIL. 



Notes during Growth. It was a very difficult matter to distinguish 

 a difference in the strength of the foliage of plants growing in the unmanured 

 Controls and in the tests with radio-active materials (unmanured). The 

 strongest plants, and the earliest to form roots, were those in the Farmyard 

 Manure Controls and in the sections where Complete Fertiliser was used. In 

 the trials dressed with Complete Fertiliser the foliage was of a deeper colour. 



Final Notes. From the First Control (unmanured) roots weighing 

 i Ib. 2 ozs. were lifted, and from the Duplicate Control i Ib. 5 ozs. The latter 

 figures were exceeded in only three instances where radio-active materials 

 (without manure) were used, the best of which (Ore B) being i Ib. 8 ozs. 



First Control with Complete Fertiliser topped the table with 2 Ibs. I2| ozs., 

 the second being Duplicate Control with Complete Fertiliser, 2 Ibs. 5i ozs., and 

 third, First Control with Farmyard Manure, 2 Ibs. i oz. 



14j ozs 134 ozs. 4 ozs. 4 ozs. 2j ozs. 



Radishes grown in Sand. 



EXPERIMENTS WITH LETTUCES. 



Adverse climatic and other conditions so affected these trials that the 

 heads did not mature. No weights were therefore recorded. 



