192 



NITROGEN, PHOSPHORUS AND POTASSIUM 



"Certain things are to be sown, not with the hope of any 

 immediate profit bemg deiived from them, but with a view to the 

 following year, because being plowed m and left m the ground, 

 they render the soil afterwaids moie fruitful.'' 



Crops for Green Manuring. — Many crops may be used for 

 plowing under legumes, rye, buckwheat, rape, oats, etc. The 



Fig 128 —A. Hairy vetch B, Crimson clover (U S D A ) 



clovers and vetch (Fig. 128) can be seeded one year with grain 

 and turned under in the fall or in late spring. Alsike clover is suit- 

 able for low lands. Mammoth clover is well adapted for poor soils 

 to get rank growth. 



Cowpeas, soybeans (Fig. 129), rape, and crimson clover^ may 

 be sown in between the rows when a cultivated crop is "laid by.''^ 



3 Crimson clover is commonly grown as a green manurmg and forage crop 

 along the Atlantic seaboard from New Jersey to the Gulf States 

 * "Laid by" means last cultivation. 



