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



15 



SERIES 2 continued. 

 EXPERIMENTS WITH CARROTS. 



Variety Sutton's Scarlet Intermediate. Sown April 26. 



MATERIAL USED. 



Approximate 



COST 



of dressing 

 21 square yards. 



WEIGHT OF PRODUCE. 



From open From open ground plots, each 

 ground plots, 21 square yards, to which Corn- 

 each 21 plete Fertiliser to the value of 

 square yards, about Id. had been applied. 



Notes during Growth. The plots dressed with Pure Radium Bromide 

 showed the most even germination, but the plants were weaker than in 

 some others. Two months from date of sowing, the Farmyard Manure 

 Control presented the strongest foliage, but was only slightly superior to- the 

 trials dressed with Ore B. The unmanured Controls were the weakest of any. 



By mid- August, Farmyard Manure Control was still ahead of all others ; 

 the weakest in growth being First Control, Lignaite, Coal Dust, Slime or Mine 

 Residue, Ore A, and Pure Radium Bromide. 



No appreciable difference could be seen in the foliage of any of the plants, 

 whether treated with Radium only or with Radium and Complete Fertiliser, 

 and certainly none of these trials appeared so strong and healthy as the Farm- 

 yard Manure Control. 



Final Notes. The weight of roots lifted from the First Control 

 (unmanured) was n Ibs. n ozs., and from the Duplicate Control 12 Ibs. 7 ozs. 

 The latter weight was surpassed in four of the trials dressed with radio-active 

 materials (unmanured). Farmyard Manure Control gave far the best return 

 with 15 Ibs. 14 ozs., Complete Fertiliser Control being second with 13 Ibs. 8 ozs. 



