iS 



GREEN MANURING. 



of green manuring is not advisable or economical. The 

 reason is that the nitrogen in its usually soluble form, as 

 applied in nitrate of soda, changes into less soluble organic 

 compounds, which are not so readily available as plant food 

 for the succeeding crop. 



Figure 6 illustrates an experiment by Prof. Wagner 

 on this subject. The ten pots were all manured alike as to 



FIG. 6. DIFFERENT RESULTS FROM NITROGEN APPLICATION IN THE 

 FALL AND IN THE SPRING. 



potash and phosphoric acid, and were divided into two 

 series of five pots each. The five pots in the first series (to 

 the left in the illustration) were planted to mustard, with 

 nitrogen applied in the fall. The following spring the 

 mustard was worked into the soil as a (non-legume? 

 green manure, and oats were planted. The second series 

 received the same amount of nitrogen as the first series, 

 but it was applied in the spring directly to the oats. The 

 oats in the pots on the right made a stronger growth and 



