ELEMENTS OF AGRICULTURE. 
'il 
the elements of nutrition that the plant cont . .; ai 4 , if 
we delay until it is completely formed, the die of the 
manure is lost. 
QUESTIONS. 
1. What are green manures ? 
2. What climates is the system best suited to ? 
3. Are green manures costly ? 
4 . How are we to calculate the expense ? 
5. What plants are used as green manures? 
(S. *How are we guided in the choice of plants t« ised for this pturpoGg • 
7 At what, time should the plants be turned unde* 1 
T£M F,m 
