* . > * Vo ¥& " ■' * • 



/ii RjNfli !# malm' 



FIG. 2. Effects of Turning Under a Crop of Mustard (non-legu- 

 minous) upon the Growth of Oats. 



Both pots were supplied with potash and phosphoric acid equally, but not with 

 nitrogen. The pot marked "Senf " had mustard turned under; the other one had 

 none. No immediate effect is shown on the growth of the oats by the previous crop 

 of mustard. 



