1901.] 



PUBLIC DOCUMENT — No. 33. 



95 



clover have been used, the former during three years, the 

 latter one year ; but it should be understood that the crops 

 of both are harvested. We have aimed to test, not the effect 

 of ploughing under these cro})s, but simply the improve- 

 ment, if any, derived from their roots and sUibl)le. The 

 results indicate little or no improvement in the condition of 

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

 provement followed the turning under of the clover sod. 

 The following table, with the curve below it, will, it is be- 

 lieved, make these facts clear : — 



Effect of Leguminous Crops upon the FoUowhuj Crop {Pounds). 



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



