Plot 3, furnished with phosphoric acid and potash, 



yielded 206 bushels. 



Plot 4, furnished with phosphoric acid and nitro- 

 gen, yielded 1 14 bushels. 



Plot 5, furnished with potash and nitrogen, yielded 132 bushels. 



So far as this series of plots is concerned we have evidence 

 that nitrogen is of the least importance, potash of the moat, and 

 phosphoric acid intermediate, and it is clearly the case that 

 phosphoric acid and potash combined give a good crop, well up 

 towards the complete mixtures. 



Combining the evidence from Series 1 and 2 and we get 

 the following : 



f Plot 20. Dissolved bone black, 

 J pi . ( Dissolved bone-black, 



(a)-{ ** } Sulphate of Ammonia, 



I p.. {Dissolved bone-black, 



[ *' I Muriate of potash, 



f Plot 19. Muriate of potash, 



I pi . f Muriate of potash, 



(f) •{ 5- "} Sulphate of ammonia, 



I pi . f Muriate of potash, 



I 3* l Dissolved bone-black, 



f Plot 18. Sulphate of ammonia, 

 I pi ( Sulphate of ammonia, 



(c) ■{ *i Dissolved bone black, 



I pi . f Sulphate of ammonia, 



I *'\ Muriate of potash, 



Group (a). Plot 4, shows that substituting 145 lbs. of sul- 

 phate of ammonia for 386 lbs. of the dissolved bone-black, in 

 Plot 20, decreases the yield to bushels; but in Plot 3, substi- 

 tuting 125 lbs. of muriate of potash for 181 lbs. of the dissolved 

 bone-black gives an increase of 82 bushels. 



In group (6), Plot 5, the substitution of 55 lbs. of sulphate of 

 ammonia for too lbs. of the muriate of potash in Plot 19, in- 

 creases the yield 8 bushels ; while in Plot 3, replacing 320 lbs. 

 of the muriate of potash in Plot 19, with 485 lbs. of dissolved 

 bone-black increases the yield 82 bushels. 



Group (V) shows that replacing 105 lbs. of sulphate of am- 

 monia with 280 lbs. dissolved bone-black added to the yield 24 



t 



