A sufficient supply of moisture makes a fertilizer more effective. Note 

 the greater response to fertilization in the vessels having more moisture. 



Vessel 45. Moisture 30 per cent, 



Vessel 49. Moisture 15 per cent, 



Vessel 58. Moisture 30 per cent, 



Vessel 64. Moisture 15 per cent, 



Vessel 69. Moisture 30 per cent. 



Vessel 78. Moisture 15 per cent, 



no fertilizer, 

 no fertilizer, 

 complete fertilizer, 

 complete fertilizer, 

 more fertilizer, 

 more fertilizer. 



Plate XIV, — A soil may contain too much or too little moisture. The 

 best crop is in the vessel having next to the largest quantity of water. 



Vessel 20. Moisture 11 per cent. Vessel 26. Moisture 25 per cent. 



Vessel 22. Moisture 13 per cent. Vessel 28. Moisture 38 per cent. 



Vessel 24. Moisture 20 per cent. Vessel 32. Moisture 45 per cent. 



