1901.] 



PUBLIC DOCUMENT — No. 33. 



95 



clover have been used, the former diirini*: three years, the 

 latter one year; but it should l)o understood that the crops 

 of ])()th are harvested. We have aimed to test, not the effect 

 of ploughing under these crops, l)ut simply the improve- 

 ment, if any, derived from their roots and stubble. The 

 results indicate little or no improvement in the condition of 

 the soil following culture of the soy bean, while a great im- 

 l)rovcmout followed the turning under of the clover sod. 

 The following table, with the curve l)elow it, will, it is be- 

 lieved, make these facts clear : — 



Effect of LeguminoHn Cropfi vpon the FoUoiri)!'/ Crop (PokihU). 



[Per cent, average no-nitrogen to average nitrogen.] 



