RATE OF HUMIFICATIONS OF GREEN MANURE. 



401 



Acidity Developed 



In order to determine to what extent the fermenting of green material 

 causes acidity, tests, by the Veitch method, were run at various intervals, 

 with the following results: 



Pounds of Limestone Needed Per Acre 



The limestone requirement was also determined by the KNO? method. 

 This method showed much less limestone needed per acre than the Veitch 

 method, but the percentage of increase in acidity was much the same by both 

 methods. 



Conclusions 



1. The alfalfa boxes did not increase appreciately in humus, whereas the 

 oats boxes doubled their humus contents in two months. The sweet clover 

 was next in humus increase, followed by cow peas. 



2. All green manures showed rapid humification. There was no in- 

 crease in percentage of humus in any of the boxes after 2 months. 



3. The boxes in which green manure was disced showed poorest progress 

 in growth of com. 



