QJREEN MANURES 



623 



Legumes 



Non-legumes 



Annual 



Biennial 





Cowpea 



Red clover 



Rye 



Soy bean 



White clover 



Oats 



Peanut 



Alsike clover 



Mustard 



Vetch 



Alfalfa 



Mangels 



Canada field pea 



Sweet clover 



Rape 



Velvet bean 





Buckwheat 



Crimson clover 







Hairy vetch 







When other conditions are equal, it is of course always 

 better to choose a leguminous green manure in preference 

 to a non-leguminous one, because of the nitrogen that may 

 be added to the soil However, it is so often difficult to 

 obtain a catch of some of the legumes that it is poor 

 management to turn the stand under until after a number 

 of years. Again, the seed of many legumes is very expen- 

 sive, almost prohibiting their use as green manures. 

 Among the legumes most commonly grown as green ma- 

 nures, cowpeas, soy beans, and peanuts may be named. 

 Many of the other legumes do not so fit into the common 

 rotations as to be handily turned under as a green manure. 



For the reasons already cited, the non-legumes have in 

 many cases proved the more popular and economic as 

 green manures. Rye and oats are much used because 

 of their rapid, abundant, and succulent growth and be- 

 cause they may be accommodated to almost any rotation. 

 They are hardy and will start on almost any kind of a 

 seed bed. They are thus extremely valuable on poor soils. 

 Often the value of such 4 green manure as oats is greatly 

 increased by sowing peas with it. The advantages of a 

 lefi:ume and a non-lewme are thus combined. 



