314 



EXPERIMENTS ON TUKNIPS. 



menfc for a turnip crop. On the plots with dung Table XII. 

 shows that 5 cwt. superphosphate gave a comparatively small 

 increase in both seasons ; while in 1882, 3f cwt. ground coprolites 

 actually decreased the yield slightly. 



No doubt the decrease is due to the large yield on plot 28 in 

 that season j)reviously explained, but it may be inferred that the 

 dung given was able to supply almost all the phosphoric acid 

 required by the turnips during the growth of the bulb, and that 



Table XII. 

 PhosjjJioric Acid with Dung. 



Table XIII. 

 SiqjerjjhosjjJiate against Ground Coinolites. 



1882. 



Plots with 

 Superphosphate. 





^ 



2 = 319-1 



3 = 311-6 



4 = 399-0 

 20 = 361-2 



9 = 193-9 



10 = 250-9 



11 = 338-4 



12 = 309-1 



Plots with 



Ground 

 Coprolites. 



16 = 347-3 



17 = 312-0 



18 = 335-2 



19 = 317-9 



23 = 234-3 



24 = 253-2 



25 = 287-3 

 13 = 207-1 



Mean = 310-4 



Mean = 286-8 



Excess in favour of \ cwts. 

 Superphospliate, ] 23-6 



1883. 



Plots with 



Plots with 



o ^ ^ 4- Ground 



kSuperpnospnate. r^ ^■^ 

 ■'■-'- ^ Coprolites. 



t3 



fee 



o 



2 = 620-4 



3 = 526-4 



4 = 632-3 

 20 = 614-7 



23 = 426-1 



24 = 433-0 



25 = 537-0 

 13 = 555-0 



16 = 617-9 



17 = 558-2 



18 = 632-3 



19 = 548-6 

 9 = 398-8 



10 = 465-0 

 11=495-0 

 12 = 486-8 



Excess in favour of ) cwts. 

 Suj)erpliosphate, ) 17-8 



Mean = 543-1 Mean = 525*3 



