GEEEN 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 gro\vn 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 a green manure as oats is greatly 

 increased by sowing peas with it. The advantages of a 

 legume and a non-legume are thus combined. 



