THE LAWN 67 
troublesome in the lawn. Manure that is taken from 
henhouses is so strong that it must be used sparingly. 
Preparing the soil. Spade the yard to a depth of six 
inches. While spading, the manure must be worked into 
the soil uniformly. Large clods must be broken with 
Fic. 43. Buckwheat Seed 
the spade. If the soil is prepared in April or May, it 
may be seeded immediately, but it is usually advisable 
to use the land for the production of a crop that will 
give an abundance of vegetation and at the same time 
provide the soil with a supply of nitrogen to serve as 
food for the young grass. In latitudes south of Wash- 
ington, D.C., cowpeas and soy beans may he used; in 
districts north of this, crimson clover, vetches, Canada 
